//m.getgobooth.com/ 必威体育下载 daily 15 2024-10-08 13:42:52 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-10-08 13:42:52 zh Copyright ©Acta Physica Sinica All Rights Reserved. 京ICP备05002789号-1 Address: PostCode：100190 Phone: 010-82649829，82649241,82649863 Email: apsoffice@iphy.ac.cn Copyright ©Acta Physica Sinica All Rights Reserved apsoffice@iphy.ac.cn 1000-3290 //m.getgobooth.com/en/article/doi/10.7498/aps.42.867 Author(s): PAN FENG, XU PEI-JUN <br/><p>In this paper, three kinds of q -deformations of three-dimensional isotropic oscillator are discussed in detail, the Hamiltonians of which have S3, SUq(2) , and Uq(3) symmetries, repectively. Especially, in the third case a specific realization of Uq(3)?SOq′ (3) is given. Relation between the q -deformed oscillator and the classical one is also discussed.</p> <br/>Acta Physica Sinica. 1993 42(6): 867-873. Published 1993-03-05 Author(s): PAN FENG, XU PEI-JUN <br/><p>In this paper, three kinds of q -deformations of three-dimensional isotropic oscillator are discussed in detail, the Hamiltonians of which have S3, SUq(2) , and Uq(3) symmetries, repectively. Especially, in the third case a specific realization of Uq(3)?SOq′ (3) is given. Relation between the q -deformed oscillator and the classical one is also discussed.</p> <br/>Acta Physica Sinica. 1993 42(6): 867-873. Published 1993-03-05 q -DEFORMATIONS OF THREE-DEMENSIONAL ISOTROPIC OSCILLATOR AND THEIR WAVE FUNCTIONS PAN FENG, XU PEI-JUN 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 867-873. article doi:10.7498/aps.42.867 10.7498/aps.42.867 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.867 867-873 //m.getgobooth.com/en/article/doi/10.7498/aps.42.874 Author(s): LIU MU-REN, KONG LING-JIANG <br/><p>To understand thermal properties in lattice gas automata, a twelve bit multispeed model on hexagonal lattice is used to simulate rest flow and Couette flow. Simulating results are compared with theoretical results and some useful conclusion are drawn.</p> <br/>Acta Physica Sinica. 1993 42(6): 874-879. Published 1993-03-05 Author(s): LIU MU-REN, KONG LING-JIANG <br/><p>To understand thermal properties in lattice gas automata, a twelve bit multispeed model on hexagonal lattice is used to simulate rest flow and Couette flow. Simulating results are compared with theoretical results and some useful conclusion are drawn.</p> <br/>Acta Physica Sinica. 1993 42(6): 874-879. Published 1993-03-05 SIMULATION OF TEMPERATURE DISTRIBUTION IN REST FLOW AND COUETTE FLOW BY USING 12 BIT LATTICE GAS AUTOMATON MODEL LIU MU-REN, KONG LING-JIANG 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 874-879. article doi:10.7498/aps.42.874 10.7498/aps.42.874 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.874 874-879 //m.getgobooth.com/en/article/doi/10.7498/aps.42.880 Author(s): ZHU JIAN-YANG <br/><p>In this paper, the renormalisation group approach is used to treat the problem of percolation on a two-dimensional square lattice with ‘glost' field and next-nearst-neighbour interactions. The critical probability Pc and the critical exponents α,β,γ,ν,δ,η are obtained.</p> <br/>Acta Physica Sinica. 1993 42(6): 880-885. Published 1993-03-05 Author(s): ZHU JIAN-YANG <br/><p>In this paper, the renormalisation group approach is used to treat the problem of percolation on a two-dimensional square lattice with ‘glost' field and next-nearst-neighbour interactions. The critical probability Pc and the critical exponents α,β,γ,ν,δ,η are obtained.</p> <br/>Acta Physica Sinica. 1993 42(6): 880-885. Published 1993-03-05 STUDY OF THE TWO-DIMENSIONAL SQUARE LATTICE PERCOLATION MODEL ZHU JIAN-YANG 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 880-885. article doi:10.7498/aps.42.880 10.7498/aps.42.880 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.880 880-885 //m.getgobooth.com/en/article/doi/10.7498/aps.42.886 Author(s): FENG JIAN, GAO XUE-YAN <br/><p>In this paper, the effect of the spatial inhomogeneity of the laser field and the size of detector acceptance angle or aperture on strong-field autoionization photoelectron spectra is investigated. It is shown that the photoelectron spectra are drastically affected by the above factors , for small detector acceptance angle or aperture size, peak switching appears in the photoelectron spectra, but for large detector acceptance angle or aperture size, peak switching is destroyed completely.</p> <br/>Acta Physica Sinica. 1993 42(6): 886-892. Published 1993-03-05 Author(s): FENG JIAN, GAO XUE-YAN <br/><p>In this paper, the effect of the spatial inhomogeneity of the laser field and the size of detector acceptance angle or aperture on strong-field autoionization photoelectron spectra is investigated. It is shown that the photoelectron spectra are drastically affected by the above factors , for small detector acceptance angle or aperture size, peak switching appears in the photoelectron spectra, but for large detector acceptance angle or aperture size, peak switching is destroyed completely.</p> <br/>Acta Physica Sinica. 1993 42(6): 886-892. Published 1993-03-05 DESTRUCTION OF PEAK SWITCHING IN STRONG-FIELD AUTOIONIZATION PHOTOELECTRON SPECTRA FENG JIAN, GAO XUE-YAN 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 886-892. article doi:10.7498/aps.42.886 10.7498/aps.42.886 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.886 886-892 //m.getgobooth.com/en/article/doi/10.7498/aps.42.893 Author(s): LIN DONG-HAI, WU QIN-YI <br/><p>A new formalism for describing the evolution of density operators was proposed. It can evaluate the evolution of density operators of strongly and weakly coupled spin systems in a u-nified way, and describe the experiments involving weak RF pluse. Some problems were explicitly treated including spin tickling, isotropic mixing in systems of two coupled nuclei (I= 1/2), dipolar evolution and strongly coupled AB and ABX spin systems.</p> <br/>Acta Physica Sinica. 1993 42(6): 893-904. Published 1993-03-05 Author(s): LIN DONG-HAI, WU QIN-YI <br/><p>A new formalism for describing the evolution of density operators was proposed. It can evaluate the evolution of density operators of strongly and weakly coupled spin systems in a u-nified way, and describe the experiments involving weak RF pluse. Some problems were explicitly treated including spin tickling, isotropic mixing in systems of two coupled nuclei (I= 1/2), dipolar evolution and strongly coupled AB and ABX spin systems.</p> <br/>Acta Physica Sinica. 1993 42(6): 893-904. Published 1993-03-05 A NEW FORMALISM FOR DESCRIBING THE EVOLUTION OF DENSITY OPERATORS LIN DONG-HAI, WU QIN-YI 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 893-904. article doi:10.7498/aps.42.893 10.7498/aps.42.893 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.893 893-904 //m.getgobooth.com/en/article/doi/10.7498/aps.42.905 Author(s): LI TONG, XU XIANG-DONG, LIU QIANG, QIAN QING, CHEN XUE-JUN <br/><p>New calculations are conducted for the differential cross sections of e-H elastic scattering in the energy range of 100-200 eV based on a multiple-scattering expansion method. Discussion of the present results is given and comparison is made with experimental data.</p> <br/>Acta Physica Sinica. 1993 42(6): 905-910. Published 1993-03-05 Author(s): LI TONG, XU XIANG-DONG, LIU QIANG, QIAN QING, CHEN XUE-JUN <br/><p>New calculations are conducted for the differential cross sections of e-H elastic scattering in the energy range of 100-200 eV based on a multiple-scattering expansion method. Discussion of the present results is given and comparison is made with experimental data.</p> <br/>Acta Physica Sinica. 1993 42(6): 905-910. Published 1993-03-05 DIFFERENTIAL CROSS SECTION CALCULATIONS OF THE e-H ELASTIC SCATTERING BASED ON A MULTIPLE-SCATTERING EXPANSION METHOD LI TONG, XU XIANG-DONG, LIU QIANG, QIAN QING, CHEN XUE-JUN 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 905-910. article doi:10.7498/aps.42.905 10.7498/aps.42.905 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.905 905-910 //m.getgobooth.com/en/article/doi/10.7498/aps.42.911 Author(s): LI SHAO-PU, LIU QIANG, XU XIANG-DONG, QIAN QING, CHEN XUE-JUN <br/><p>Calculations are conducted for the differential cross sections of elastic scattering of atomic hydrogen by positron in the energy range of 50-300 eV based on a multiple-scattering expansion method. Discussion of the present results is given and comparison is made with other current theoretical calculations.</p> <br/>Acta Physica Sinica. 1993 42(6): 911-917. Published 1993-03-05 Author(s): LI SHAO-PU, LIU QIANG, XU XIANG-DONG, QIAN QING, CHEN XUE-JUN <br/><p>Calculations are conducted for the differential cross sections of elastic scattering of atomic hydrogen by positron in the energy range of 50-300 eV based on a multiple-scattering expansion method. Discussion of the present results is given and comparison is made with other current theoretical calculations.</p> <br/>Acta Physica Sinica. 1993 42(6): 911-917. Published 1993-03-05 CALCULATIONS OF POSITRON SCATTERING BY ATOMIC HYDROGEN BASED ON A MULTIPLE-SCATTERING EXPANSION METHOD LI SHAO-PU, LIU QIANG, XU XIANG-DONG, QIAN QING, CHEN XUE-JUN 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 911-917. article doi:10.7498/aps.42.911 10.7498/aps.42.911 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.911 911-917 //m.getgobooth.com/en/article/doi/10.7498/aps.42.918 Author(s): GUO HONG, GUO GUANG-CAN <br/><p>Based on the definition of Pegg-Barnett phase state, the phase probability distribution functions of various light fields, such as Fock state, coherent state, squeezed state, pair coherent state, entangled state, and so forth and the time evolution of that of some single-mode light fields through the propagation in medium are analytically calculated, while the corresponding computational simulations are presented.</p> <br/>Acta Physica Sinica. 1993 42(6): 918-924. Published 1993-03-05 Author(s): GUO HONG, GUO GUANG-CAN <br/><p>Based on the definition of Pegg-Barnett phase state, the phase probability distribution functions of various light fields, such as Fock state, coherent state, squeezed state, pair coherent state, entangled state, and so forth and the time evolution of that of some single-mode light fields through the propagation in medium are analytically calculated, while the corresponding computational simulations are presented.</p> <br/>Acta Physica Sinica. 1993 42(6): 918-924. Published 1993-03-05 STATISTICAL PHASE PROPERTIES OF LIGHT FIELDS GUO HONG, GUO GUANG-CAN 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 918-924. article doi:10.7498/aps.42.918 10.7498/aps.42.918 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.918 918-924 //m.getgobooth.com/en/article/doi/10.7498/aps.42.925 Author(s): LUO ZHEN-FEI, XU ZHI-ZHAN, XU LEI, LIANG SHI-DONG <br/><p>The spontaneous-emission line shape of two atoms interacting with a vacuum field in an ideal cavity with different couplings is investigated. In general, the "vaccum-field Rabi splitting" will show a 12-peaked structure. The 2-peaked structure for one atom and 6-peaked structure for two identical atoms may be obtained as two examples.</p> <br/>Acta Physica Sinica. 1993 42(6): 925-929. Published 1993-03-05 Author(s): LUO ZHEN-FEI, XU ZHI-ZHAN, XU LEI, LIANG SHI-DONG <br/><p>The spontaneous-emission line shape of two atoms interacting with a vacuum field in an ideal cavity with different couplings is investigated. In general, the "vaccum-field Rabi splitting" will show a 12-peaked structure. The 2-peaked structure for one atom and 6-peaked structure for two identical atoms may be obtained as two examples.</p> <br/>Acta Physica Sinica. 1993 42(6): 925-929. Published 1993-03-05 A GENERAL THEORY OF SPONTANEOUS-EMISSION LINE SHAPE OF TWO ATOMS LUO ZHEN-FEI, XU ZHI-ZHAN, XU LEI, LIANG SHI-DONG 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 925-929. article doi:10.7498/aps.42.925 10.7498/aps.42.925 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.925 925-929 //m.getgobooth.com/en/article/doi/10.7498/aps.42.930 Author(s): HUANG YONG-LIN, BA EN-XU <br/><p>We have experimentally studied the instabilities of a homogeneously broadened single-longitudinal mode CO2 laser with transverse magnetic field. Self-pulsing and chaos have been observed by varying the magnetic field. The strange attractor of the laser system has also been obtained. A discussion is made on the mechanism of the phenomena observed.</p> <br/>Acta Physica Sinica. 1993 42(6): 930-934. Published 1993-03-05 Author(s): HUANG YONG-LIN, BA EN-XU <br/><p>We have experimentally studied the instabilities of a homogeneously broadened single-longitudinal mode CO2 laser with transverse magnetic field. Self-pulsing and chaos have been observed by varying the magnetic field. The strange attractor of the laser system has also been obtained. A discussion is made on the mechanism of the phenomena observed.</p> <br/>Acta Physica Sinica. 1993 42(6): 930-934. Published 1993-03-05 CHAOS AND OBSERVATION OF STRANGE ATTRACTOR IN CO2 LASER WITH TRANSVERSE MAGNETIC FIELD HUANG YONG-LIN, BA EN-XU 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 930-934. article doi:10.7498/aps.42.930 10.7498/aps.42.930 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.930 930-934 //m.getgobooth.com/en/article/doi/10.7498/aps.42.935 Author(s): HE YI-PING, CHEN DE-MING, LIU YONG-GUI, LI CHUAN-LU <br/><p>In this paper, the flat type of CFEL partialy loading dielectric with wiggler is studied using two dimensional kinetic coupling mode theory of three waves. It is shown that the system for arbitary thickness of dielectric can generate short wavelength coherent radiation by using low energy electron beam. Suitably choosing the system parameters, the growth rate of the kind of CFEL may be much higher than general FEL and CFEL. It is also shown that the main mode of super radiation in the system is LSE mode.</p> <br/>Acta Physica Sinica. 1993 42(6): 935-939. Published 1993-03-05 Author(s): HE YI-PING, CHEN DE-MING, LIU YONG-GUI, LI CHUAN-LU <br/><p>In this paper, the flat type of CFEL partialy loading dielectric with wiggler is studied using two dimensional kinetic coupling mode theory of three waves. It is shown that the system for arbitary thickness of dielectric can generate short wavelength coherent radiation by using low energy electron beam. Suitably choosing the system parameters, the growth rate of the kind of CFEL may be much higher than general FEL and CFEL. It is also shown that the main mode of super radiation in the system is LSE mode.</p> <br/>Acta Physica Sinica. 1993 42(6): 935-939. Published 1993-03-05 KINETIC COUPLING MODE THEORY OF THE FLAT TYPE OF CFEL LOADING DIELECTRIC WITH WIGGLER HE YI-PING, CHEN DE-MING, LIU YONG-GUI, LI CHUAN-LU 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 935-939. article doi:10.7498/aps.42.935 10.7498/aps.42.935 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.935 935-939 //m.getgobooth.com/en/article/doi/10.7498/aps.42.940 Author(s): XU ZHI-ZHAN, HAN SHEN-SHENG, SHEN BAI-FEI, JIANG ZHI-MING, SUN LAN, FAN PIN-ZHONG, WANG XIAO-FANG, QIAN AI-DI <br/><p>The results of experimental and theoretical study on population inversion in the He-like Al ions are presented for the pumping laser intensity range of ～2×1014W|cm2. The effects of different target structure (foil, plane and half-cylinder) on the 2p-3d population inversion of the He-like Al ions (45nm) in a spot focused laser plasma have been studied experimentally. The plasma parameters such as electron temperature, electron density and the ratio of H-like ion density to He-like ion density, are diagnosed by spectroscopic methods. Results are compared with C-R model calculations.</p> <br/>Acta Physica Sinica. 1993 42(6): 940-948. Published 1993-03-05 Author(s): XU ZHI-ZHAN, HAN SHEN-SHENG, SHEN BAI-FEI, JIANG ZHI-MING, SUN LAN, FAN PIN-ZHONG, WANG XIAO-FANG, QIAN AI-DI <br/><p>The results of experimental and theoretical study on population inversion in the He-like Al ions are presented for the pumping laser intensity range of ～2×1014W|cm2. The effects of different target structure (foil, plane and half-cylinder) on the 2p-3d population inversion of the He-like Al ions (45nm) in a spot focused laser plasma have been studied experimentally. The plasma parameters such as electron temperature, electron density and the ratio of H-like ion density to He-like ion density, are diagnosed by spectroscopic methods. Results are compared with C-R model calculations.</p> <br/>Acta Physica Sinica. 1993 42(6): 940-948. Published 1993-03-05 A STUDY ON "WATER WINDOW" RANGE 2p-3d POPULATION INVERSION OF He-LIKE AI IONS X-RAY LASER XU ZHI-ZHAN, HAN SHEN-SHENG, SHEN BAI-FEI, JIANG ZHI-MING, SUN LAN, FAN PIN-ZHONG, WANG XIAO-FANG, QIAN AI-DI 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 940-948. article doi:10.7498/aps.42.940 10.7498/aps.42.940 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.940 940-948 //m.getgobooth.com/en/article/doi/10.7498/aps.42.949 Author(s): QIAN ZU-WEN <br/><p>Based on the perturbation theory, an investigation on reflection and refraction of nonlinear wave on a boundary in fluids or solids was carried out a familiar result was obtained that the second harmonic wave always satisfies an inhomogeneous wave equation. In order to find its special solution, the method of separated variables as well as Lagrange's method of variation parameters were invoked , and a trouble to the boundary-value problem of nonlinear acoustics will consequently result in that a separation constant is to be determined. In this paper , the constant was determined and the special solution was given uniquely. It is shown that a paradox will occur unless we select a special solution from the following two solutions, which are accumulation along the direction either parallel to or perpendicular to the boundary plane. Whether one can be selected depends on the boundary situation. By using the theory, the reflection and the refraction on a plane boundary were analysed. Furthermore, it is pointed out that this theory can deal with all of the boundary-value problems in nonlinear acoustics.</p> <br/>Acta Physica Sinica. 1993 42(6): 949-953. Published 1993-03-05 Author(s): QIAN ZU-WEN <br/><p>Based on the perturbation theory, an investigation on reflection and refraction of nonlinear wave on a boundary in fluids or solids was carried out a familiar result was obtained that the second harmonic wave always satisfies an inhomogeneous wave equation. In order to find its special solution, the method of separated variables as well as Lagrange's method of variation parameters were invoked , and a trouble to the boundary-value problem of nonlinear acoustics will consequently result in that a separation constant is to be determined. In this paper , the constant was determined and the special solution was given uniquely. It is shown that a paradox will occur unless we select a special solution from the following two solutions, which are accumulation along the direction either parallel to or perpendicular to the boundary plane. Whether one can be selected depends on the boundary situation. By using the theory, the reflection and the refraction on a plane boundary were analysed. Furthermore, it is pointed out that this theory can deal with all of the boundary-value problems in nonlinear acoustics.</p> <br/>Acta Physica Sinica. 1993 42(6): 949-953. Published 1993-03-05 SPECIAL SOLUTION OF SECOND HARMONIC WAVE EQUATION IN NONLINEAR ACOUSTICS AND APPLICATIONS TO BOUNDARY-VALUE PROBLEM QIAN ZU-WEN 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 949-953. article doi:10.7498/aps.42.949 10.7498/aps.42.949 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.949 949-953 //m.getgobooth.com/en/article/doi/10.7498/aps.42.954 Author(s): HE XIAN-CHANG, WU ZI-QIN, ZHAO TE-XIU, Lü ZHI-HUI, WANG XIAO-PING, SUN GUO-XI <br/><p>An investigation on the lattice deformation of porous silicon layer was completed by means of symmetric and asymmetric X-ray double crystal diffraction. The structure change of porous layer is larger for the sample under lower current density during the anodization in hydrofluoric acid. Both the orientation offset and the lattice expansion in the direction normal as well as parallel to the surface of the matrixes have been measured. The crystal lattice of porous layer formed on the (111) silicon surface is proposed to be triangular distorted, and it gradually matches the lattice of substrate silicon after a time in the atmosphere.</p> <br/>Acta Physica Sinica. 1993 42(6): 954-962. Published 1993-03-05 Author(s): HE XIAN-CHANG, WU ZI-QIN, ZHAO TE-XIU, Lü ZHI-HUI, WANG XIAO-PING, SUN GUO-XI <br/><p>An investigation on the lattice deformation of porous silicon layer was completed by means of symmetric and asymmetric X-ray double crystal diffraction. The structure change of porous layer is larger for the sample under lower current density during the anodization in hydrofluoric acid. Both the orientation offset and the lattice expansion in the direction normal as well as parallel to the surface of the matrixes have been measured. The crystal lattice of porous layer formed on the (111) silicon surface is proposed to be triangular distorted, and it gradually matches the lattice of substrate silicon after a time in the atmosphere.</p> <br/>Acta Physica Sinica. 1993 42(6): 954-962. Published 1993-03-05 INVESTIGATION OF LATTICE DEFORMATION OF POROUS SILICON FILMS BY X-RAY DOUBLE CRYSTAL DIFFRACTION HE XIAN-CHANG, WU ZI-QIN, ZHAO TE-XIU, Lü ZHI-HUI, WANG XIAO-PING, SUN GUO-XI 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 954-962. article doi:10.7498/aps.42.954 10.7498/aps.42.954 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.954 954-962 //m.getgobooth.com/en/article/doi/10.7498/aps.42.963 Author(s): QI MING, LUO JIN-SHENG, J. SHIRAKASHI, S. NOZAKI, K. TAKAHASHI, E. TOKUMITSU, M. KONAGAI <br/><p>The Raman scattering by LO phonon-plasmon coupled (LOPC) mode in heavily carbon doped p-type GaAs grown by MOMBE has been studied. It was shown by the lineshape analysis based on a theoretical model for the Raman scattering rate that the p-type GaAs has only one LOPC structure in contrast to the two modes in n-type doping case. The influence of heavily doping on the Raman spectroscopy was also discussed based on the experimental results. The linewidth broadening and the red shift of the LOPC mode scattering peak at the ul-trahigh doping level are induced by the crystalline disorder and effects of lattice deformation.</p> <br/>Acta Physica Sinica. 1993 42(6): 963-968. Published 1993-03-05 Author(s): QI MING, LUO JIN-SHENG, J. SHIRAKASHI, S. NOZAKI, K. TAKAHASHI, E. TOKUMITSU, M. KONAGAI <br/><p>The Raman scattering by LO phonon-plasmon coupled (LOPC) mode in heavily carbon doped p-type GaAs grown by MOMBE has been studied. It was shown by the lineshape analysis based on a theoretical model for the Raman scattering rate that the p-type GaAs has only one LOPC structure in contrast to the two modes in n-type doping case. The influence of heavily doping on the Raman spectroscopy was also discussed based on the experimental results. The linewidth broadening and the red shift of the LOPC mode scattering peak at the ul-trahigh doping level are induced by the crystalline disorder and effects of lattice deformation.</p> <br/>Acta Physica Sinica. 1993 42(6): 963-968. Published 1993-03-05 RAMAN SCATTERING STUDY OF LO PHONON-PLASMON COUPLED MODE IN HEAVILY CARBON DOPED p-TYPE GaAs QI MING, LUO JIN-SHENG, J. SHIRAKASHI, S. NOZAKI, K. TAKAHASHI, E. TOKUMITSU, M. KONAGAI 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 963-968. article doi:10.7498/aps.42.963 10.7498/aps.42.963 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.963 963-968 //m.getgobooth.com/en/article/doi/10.7498/aps.42.969 Author(s): SU FANG, WU XI-JUN, QIN XIAO-YING, KIE BIN, JI XIAO-LI <br/><p>Two kinds of nanocrystalline materials CaF2(grain fineness D =16nm) and Ca0.75La0.25F2.25(D = 11nm) possessing clean interfaces were prepared with the method of inert gas evaporation and pressed under ultra high vacuum, Their complex impedance spectra were meas-sured in detail in the temperature range of 31℃ to 530℃. The results show that (1) In the range of 300℃ to 530℃, both of the two kinds of nanocrystalline ionic solids obey the Arrhe-nius equation well; (2) Ionic conductivity of nano-CaF2 is about one order of magnitude higher than that of polycrystalline CaF2, two order of magnitude higher than that of monocrystalline CaF2, activation energy for ionic conduction, E=1.14eV; (3) Ionic conductivity of nano-Ca0.75La0.25F2.25 is 1(300℃)-0.6(525℃) order of magnitude higher than that of nano-CaF2, activation energy E is 1.00eV, somewhat lower than that of nano-CaF2, (4) When the temperature rises from 250℃ to 525℃ , the resistance of grains drops about one order of magnitude, but the resistance of interfaces descends monotonously over four order of magnetude. It is demostrated that migration of F- depends on diffusion among grains at temperature lower than 400℃, and also upon diffusion among interfaces at temperature higher than 450℃. To decrease grain fineness of materials to nanometer-size as well as to mingle fluoride with higher valence can increase the ionic conductivity obviously.</p> <br/>Acta Physica Sinica. 1993 42(6): 969-977. Published 1993-03-05 Author(s): SU FANG, WU XI-JUN, QIN XIAO-YING, KIE BIN, JI XIAO-LI <br/><p>Two kinds of nanocrystalline materials CaF2(grain fineness D =16nm) and Ca0.75La0.25F2.25(D = 11nm) possessing clean interfaces were prepared with the method of inert gas evaporation and pressed under ultra high vacuum, Their complex impedance spectra were meas-sured in detail in the temperature range of 31℃ to 530℃. The results show that (1) In the range of 300℃ to 530℃, both of the two kinds of nanocrystalline ionic solids obey the Arrhe-nius equation well; (2) Ionic conductivity of nano-CaF2 is about one order of magnitude higher than that of polycrystalline CaF2, two order of magnitude higher than that of monocrystalline CaF2, activation energy for ionic conduction, E=1.14eV; (3) Ionic conductivity of nano-Ca0.75La0.25F2.25 is 1(300℃)-0.6(525℃) order of magnitude higher than that of nano-CaF2, activation energy E is 1.00eV, somewhat lower than that of nano-CaF2, (4) When the temperature rises from 250℃ to 525℃ , the resistance of grains drops about one order of magnitude, but the resistance of interfaces descends monotonously over four order of magnetude. It is demostrated that migration of F- depends on diffusion among grains at temperature lower than 400℃, and also upon diffusion among interfaces at temperature higher than 450℃. To decrease grain fineness of materials to nanometer-size as well as to mingle fluoride with higher valence can increase the ionic conductivity obviously.</p> <br/>Acta Physica Sinica. 1993 42(6): 969-977. Published 1993-03-05 EFFECT OF STRUCTURE ON IONIC CONDUCTIVITY IN THE NANOCRYSTALLINE MATERIALS CaF2 AND Ca0.75La0.25F2.25 SU FANG, WU XI-JUN, QIN XIAO-YING, KIE BIN, JI XIAO-LI 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 969-977. article doi:10.7498/aps.42.969 10.7498/aps.42.969 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.969 969-977 //m.getgobooth.com/en/article/doi/10.7498/aps.42.978 Author(s): ZHAO YONG, ZUGE XIANG-BIN, HE YE-YE <br/><p>The mechanism of Tc suppression induced by Zn substitution for Cu in YBa2Cu3O7-y system has been studied with respect to its electronic transport properties in normal state, superconducting critical temperature, crystal structure, oxygen stoichiometry and so forth. The results show that Zn ion acts as impurity scattering centre, leading to the increase in the resistivity as well as to the anomalous changes of the resistance-temperature relation. In addition , Zn substitution for Cu reduces the carrier concentration due to the reduction of the number of Cu other than the oxidation state in CuO planes, which precludes the band-filling and carrier-over-saturation models for explaining the mechanism of Tc suppression. Semi-quantitative results reveal that each Zn ion present a scattering cross section with a radius larger than the average Cu-O bond length of the CuO planes. This means that a non-superconducting core may appear around each Zn ion. As a result, the superconducting path in CuO plane will be destroyed gradually.as a percolation process. The percolation threshold observed experimentally is consistent with the theoretical calculation. We believe that the emergence of the normal core together with the consequent percolation is the reason why Tc is suppressed so rapidly by Zn substitution for Cu.</p> <br/>Acta Physica Sinica. 1993 42(6): 978-986. Published 1993-03-05 Author(s): ZHAO YONG, ZUGE XIANG-BIN, HE YE-YE <br/><p>The mechanism of Tc suppression induced by Zn substitution for Cu in YBa2Cu3O7-y system has been studied with respect to its electronic transport properties in normal state, superconducting critical temperature, crystal structure, oxygen stoichiometry and so forth. The results show that Zn ion acts as impurity scattering centre, leading to the increase in the resistivity as well as to the anomalous changes of the resistance-temperature relation. In addition , Zn substitution for Cu reduces the carrier concentration due to the reduction of the number of Cu other than the oxidation state in CuO planes, which precludes the band-filling and carrier-over-saturation models for explaining the mechanism of Tc suppression. Semi-quantitative results reveal that each Zn ion present a scattering cross section with a radius larger than the average Cu-O bond length of the CuO planes. This means that a non-superconducting core may appear around each Zn ion. As a result, the superconducting path in CuO plane will be destroyed gradually.as a percolation process. The percolation threshold observed experimentally is consistent with the theoretical calculation. We believe that the emergence of the normal core together with the consequent percolation is the reason why Tc is suppressed so rapidly by Zn substitution for Cu.</p> <br/>Acta Physica Sinica. 1993 42(6): 978-986. Published 1993-03-05 MECHANISM OF Tc DEPRESSION INDUCED BY Zn SUBSTITUTION FOR Cu IN YBa2Cu3O7-y SYSTEM ZHAO YONG, ZUGE XIANG-BIN, HE YE-YE 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 978-986. article doi:10.7498/aps.42.978 10.7498/aps.42.978 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.978 978-986 //m.getgobooth.com/en/article/doi/10.7498/aps.42.987 Author(s): ZHANG GUO-MING, YANG CHUAN-ZHANG <br/><p>The single-spin-flip Metropolis-Monte-Carlo algorithm is applied to the study of phase diagram of Ising ferromagnet with mixed spins of S = l/2 and S = 1 with a crystal field interaction on the honeycomb lattice. The phase diagram we obtained is very close to the exact solutions and better than the results of effective field theory with correlations. All these make us arrixe the conclusion that the Metropolis Monte Carlo algorithm can also be used to study the mixed-spin model.</p> <br/>Acta Physica Sinica. 1993 42(6): 987-991. Published 1993-03-05 Author(s): ZHANG GUO-MING, YANG CHUAN-ZHANG <br/><p>The single-spin-flip Metropolis-Monte-Carlo algorithm is applied to the study of phase diagram of Ising ferromagnet with mixed spins of S = l/2 and S = 1 with a crystal field interaction on the honeycomb lattice. The phase diagram we obtained is very close to the exact solutions and better than the results of effective field theory with correlations. All these make us arrixe the conclusion that the Metropolis Monte Carlo algorithm can also be used to study the mixed-spin model.</p> <br/>Acta Physica Sinica. 1993 42(6): 987-991. Published 1993-03-05 MONTE CARLO STUDY OF THE PHASE DIAGRAM OF ISING FERROMAGNET WITH MIXED SPINS OF S=l/2 AND S=l WITH A CRYSTAL FIELD INTERACTION ON THE HONEYCOMB LATTICE ZHANG GUO-MING, YANG CHUAN-ZHANG 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 987-991. article doi:10.7498/aps.42.987 10.7498/aps.42.987 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.987 987-991 //m.getgobooth.com/en/article/doi/10.7498/aps.42.992 Author(s): YI LIN, YAO KAI-LUN <br/><p>Based on our previous work, introducing an extended Goldbart ansatz, all eigenvalues of the Hessian matrix in our three-dimensional spin glass model are obtained. It is found that the vanishing smallest eigenvalue λ3 has two solutions, which correspond to the Gabay-Toulouse (GT) upper and Almeida-Thouless (AT) lower critical lines respectively. Finally, the relation between our theory and other method is discussed.</p> <br/>Acta Physica Sinica. 1993 42(6): 992-998. Published 1993-03-05 Author(s): YI LIN, YAO KAI-LUN <br/><p>Based on our previous work, introducing an extended Goldbart ansatz, all eigenvalues of the Hessian matrix in our three-dimensional spin glass model are obtained. It is found that the vanishing smallest eigenvalue λ3 has two solutions, which correspond to the Gabay-Toulouse (GT) upper and Almeida-Thouless (AT) lower critical lines respectively. Finally, the relation between our theory and other method is discussed.</p> <br/>Acta Physica Sinica. 1993 42(6): 992-998. Published 1993-03-05 THREE-DIMENSIONAL QUANTUM SPIN GLASS THEORY (Ⅱ)——STABILITY ANALYSIS YI LIN, YAO KAI-LUN 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 992-998. article doi:10.7498/aps.42.992 10.7498/aps.42.992 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.992 992-998 //m.getgobooth.com/en/article/doi/10.7498/aps.42.999 Author(s): SHEN BAO-GEN, KONG LIN-SHU, CAO LEI <br/><p>We have prepared (Er1-xSmx)2Fe17Cy(x≤0.8,1.5≤y≤2.5) Compounds with a rhombo-hedral Th2Zn17- type structure by melt-spinning . These carbides are found to be stable at high temperature. The (Er1-xSmx)2Fe17Cy carbides with y = 2. 5 have unit cell volumes about 6.3% larger and Curie tewperatures about 330-360K higher than those of the 2:17 parent compounds. Room-temperature saturation magnetizations increase with increasing C content. It is found that the carbides containing Sm exhibit easy c-axis anisotropy at room temperature. The anisotropy field of (Er0.2Sm0.82Fe17C1.5 at room temperature is 8T.</p> <br/>Acta Physica Sinica. 1993 42(6): 999-1005. Published 1993-03-05 Author(s): SHEN BAO-GEN, KONG LIN-SHU, CAO LEI <br/><p>We have prepared (Er1-xSmx)2Fe17Cy(x≤0.8,1.5≤y≤2.5) Compounds with a rhombo-hedral Th2Zn17- type structure by melt-spinning . These carbides are found to be stable at high temperature. The (Er1-xSmx)2Fe17Cy carbides with y = 2. 5 have unit cell volumes about 6.3% larger and Curie tewperatures about 330-360K higher than those of the 2:17 parent compounds. Room-temperature saturation magnetizations increase with increasing C content. It is found that the carbides containing Sm exhibit easy c-axis anisotropy at room temperature. The anisotropy field of (Er0.2Sm0.82Fe17C1.5 at room temperature is 8T.</p> <br/>Acta Physica Sinica. 1993 42(6): 999-1005. Published 1993-03-05 STRUCTURE AND MAGNETIC PROPERTIES OF RAPIDLY QUENCHED (Er1-xSmx)2Fe17Cy SHEN BAO-GEN, KONG LIN-SHU, CAO LEI 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 999-1005. article doi:10.7498/aps.42.999 10.7498/aps.42.999 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.999 999-1005 //m.getgobooth.com/en/article/doi/10.7498/aps.42.1006 Author(s): HE ZHENG-MING, LU GUO-RONG, ZHANG DAO-YUAN, XU YUN-HUA, JIN JIAN-HUI <br/><p>The ferromagnetic resonance spectra of FeCrZr amorphous alloys have been studied, and compared with that of FeCrB. It is found that there is a greater change in the resonance spectra of Fe-base amorphous alloys when the material is doped with Zr instead of B. The experimental results are analysed.</p> <br/>Acta Physica Sinica. 1993 42(6): 1006-1011. Published 1993-03-05 Author(s): HE ZHENG-MING, LU GUO-RONG, ZHANG DAO-YUAN, XU YUN-HUA, JIN JIAN-HUI <br/><p>The ferromagnetic resonance spectra of FeCrZr amorphous alloys have been studied, and compared with that of FeCrB. It is found that there is a greater change in the resonance spectra of Fe-base amorphous alloys when the material is doped with Zr instead of B. The experimental results are analysed.</p> <br/>Acta Physica Sinica. 1993 42(6): 1006-1011. Published 1993-03-05 FERROMAGNETIC RESONANCE STUDY IN FeCrZr AMORPHOUS ALLOYS HE ZHENG-MING, LU GUO-RONG, ZHANG DAO-YUAN, XU YUN-HUA, JIN JIAN-HUI 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 1006-1011. article doi:10.7498/aps.42.1006 10.7498/aps.42.1006 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.1006 1006-1011 //m.getgobooth.com/en/article/doi/10.7498/aps.42.1012 Author(s): LI SHI-CHEN <br/><p>In order to discribe piezoelectric strain optical modulator (PESOM), we analyzed LiNbO3 crystal resonator excited by distributed piezoelectric source in detial in this paper. The quantitative results of structure of strain field are obtained in one-dimension approximation for PESOM.</p> <br/>Acta Physica Sinica. 1993 42(6): 1012-1019. Published 1993-03-05 Author(s): LI SHI-CHEN <br/><p>In order to discribe piezoelectric strain optical modulator (PESOM), we analyzed LiNbO3 crystal resonator excited by distributed piezoelectric source in detial in this paper. The quantitative results of structure of strain field are obtained in one-dimension approximation for PESOM.</p> <br/>Acta Physica Sinica. 1993 42(6): 1012-1019. Published 1993-03-05 ANALYSIS ON LiNbO3 CRYSTAL RESONATOR EXCITED BY DISTRIBUTED PIEZOELECTRIC SOURCE LI SHI-CHEN 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 1012-1019. article doi:10.7498/aps.42.1012 10.7498/aps.42.1012 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.1012 1012-1019 //m.getgobooth.com/en/article/doi/10.7498/aps.42.1020 Author(s): LI SHI-CHEN <br/><p>Axis-cut LiNbO3 crystal piezoelectric strain optical modulators (PESOM)and its properties when they used as laser mode lockers are analysed in detail. We have proved that x-cut plate is the best form used for laser mode locker. And y-cut or z-cut plate will result in loss modulation and frequency modulation at the same time, so in principle they are not suitable for using as laser mode locker operating at steady state.</p> <br/>Acta Physica Sinica. 1993 42(6): 1020-1026. Published 1993-03-05 Author(s): LI SHI-CHEN <br/><p>Axis-cut LiNbO3 crystal piezoelectric strain optical modulators (PESOM)and its properties when they used as laser mode lockers are analysed in detail. We have proved that x-cut plate is the best form used for laser mode locker. And y-cut or z-cut plate will result in loss modulation and frequency modulation at the same time, so in principle they are not suitable for using as laser mode locker operating at steady state.</p> <br/>Acta Physica Sinica. 1993 42(6): 1020-1026. Published 1993-03-05 ANALYSIS ON LiNbO3 CRYSTAL PIEZOELECTRIC RESONATORAND LASER MODE LOCKER LI SHI-CHEN 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 1020-1026. article doi:10.7498/aps.42.1020 10.7498/aps.42.1020 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.1020 1020-1026 //m.getgobooth.com/en/article/doi/10.7498/aps.42.1027 Author(s): YAN JUN-JUE, BAI CHUAN-YONG, YANG WEI-SHENG, WANG YU-GANG, ZHAO WEI-JIANG, YU FU-CHUN, ZHAI PENG-JI, TANG XIAO-WEI <br/><p>In this work we investigate damages on graphite surface gercerated by bombardment with 530 KeV Au+ or 4.5 MeV Au++ at a dose of 1×1012 cm-2. The most significant damages are hillocks with a diameter around 1. 8 nm, as seen from our STM images. Very often they are surrounded by variable 31/2×31/2R30° superstructures of graphite, which die away within a distance of 1 to 3 nm. The density of the hillocks is in good agreement with the ion dose, indicating that they were induced by individual incident gold ions. Besides, in the STM images of higher magnifications there exist many smaller hillocks, which might be caused by the secondary ions or atoms.</p> <br/>Acta Physica Sinica. 1993 42(6): 1027-1034. Published 1993-03-05 Author(s): YAN JUN-JUE, BAI CHUAN-YONG, YANG WEI-SHENG, WANG YU-GANG, ZHAO WEI-JIANG, YU FU-CHUN, ZHAI PENG-JI, TANG XIAO-WEI <br/><p>In this work we investigate damages on graphite surface gercerated by bombardment with 530 KeV Au+ or 4.5 MeV Au++ at a dose of 1×1012 cm-2. The most significant damages are hillocks with a diameter around 1. 8 nm, as seen from our STM images. Very often they are surrounded by variable 31/2×31/2R30° superstructures of graphite, which die away within a distance of 1 to 3 nm. The density of the hillocks is in good agreement with the ion dose, indicating that they were induced by individual incident gold ions. Besides, in the STM images of higher magnifications there exist many smaller hillocks, which might be caused by the secondary ions or atoms.</p> <br/>Acta Physica Sinica. 1993 42(6): 1027-1034. Published 1993-03-05 SCANNING TUNNELING MICROSCOPY INVESTIGATION OF GOLD-ION BOMBARDMENT DAMAGES ON GRAPHITE SURFACE YAN JUN-JUE, BAI CHUAN-YONG, YANG WEI-SHENG, WANG YU-GANG, ZHAO WEI-JIANG, YU FU-CHUN, ZHAI PENG-JI, TANG XIAO-WEI 1993-03-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1993 42(6): 1027-1034. article doi:10.7498/aps.42.1027 10.7498/aps.42.1027 Acta Physica Sinica 42 6 1993-03-05 //m.getgobooth.com/en/article/doi/10.7498/aps.42.1027 1027-1034