//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.40.169 Author(s): QU SHAO-HUA, YAO KAI-LUN, YU BO-MING <br/><p>In this paper, we use the renormalisation group approach and Monte-Carlo simulation to treat the problem of percolation on a two-dimensional square lattice with next-nearest-neighbour interactions. The critical probability pc and the critical exponents α,β,γ and so forth are obtained. It is shown that the two-dimensional percolation problem with next-nearest-neighbour interactions belongs to different universality class from that only with nearest-neighbour interactions.</p> <br/>Acta Physica Sinica. 1991 40(2): 169-174. Published 1991-01-05 Author(s): QU SHAO-HUA, YAO KAI-LUN, YU BO-MING <br/><p>In this paper, we use the renormalisation group approach and Monte-Carlo simulation to treat the problem of percolation on a two-dimensional square lattice with next-nearest-neighbour interactions. The critical probability pc and the critical exponents α,β,γ and so forth are obtained. It is shown that the two-dimensional percolation problem with next-nearest-neighbour interactions belongs to different universality class from that only with nearest-neighbour interactions.</p> <br/>Acta Physica Sinica. 1991 40(2): 169-174. Published 1991-01-05 STUDY OF THE TWO-DIMENSIONAL NEXT-NEAREST-NEIG-HBOUR PERCOLATION MODEL QU SHAO-HUA, YAO KAI-LUN, YU BO-MING 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 169-174. article doi:10.7498/aps.40.169 10.7498/aps.40.169 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.169 169-174 //m.getgobooth.com/en/article/doi/10.7498/aps.40.175 Author(s): LI GUO-QIANG <br/><p>The finite temperature self-consistent semiclassical equation is derived with the utilization of Skyrme force and semiclassical approximation. This equation is solved numerically by employing the imaginary time step method. The nucleon densities of some hot spherical nuclei are determined and the RMS radii are calculated.</p> <br/>Acta Physica Sinica. 1991 40(2): 175-181. Published 1991-01-05 Author(s): LI GUO-QIANG <br/><p>The finite temperature self-consistent semiclassical equation is derived with the utilization of Skyrme force and semiclassical approximation. This equation is solved numerically by employing the imaginary time step method. The nucleon densities of some hot spherical nuclei are determined and the RMS radii are calculated.</p> <br/>Acta Physica Sinica. 1991 40(2): 175-181. Published 1991-01-05 FINITE TEMPERATURE SELF-CONSISTENT SEMICLASSICAL EQUATION AND ITS IMAGINARY TIME STEP SOLUTION LI GUO-QIANG 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 175-181. article doi:10.7498/aps.40.175 10.7498/aps.40.175 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.175 175-181 //m.getgobooth.com/en/article/doi/10.7498/aps.40.182 Author(s): CHANG WEN-WEI, ZHANG LI-FU, SHAO FU-QIU <br/><p>In this paper, we discuss the physical mechanism of laser plasma wake wave and beat wave accelerators by means of theoretical analysis and particle simulation methods. The results show that: as long as laser plasma wave has Vph≈c and is strong enough, and with a proper transverse magnetic field applied, we may accelerate relativistic electrons to the order of magnitude of GeV within a distance of meters. We have also studied the problem of ES wave with low phase velocity generated by laser plasma Raman scattering to accelerate non-relativistic electrons by using particle simulation methods, and possibility of multistage, or multiwave, acceleration is explored as well. The results show that: taking the advantage of laser plasma wave accelerator, we will be able to get high energy electrons of the order of magnitude of Gev under ordinary laboratory conditions.</p> <br/>Acta Physica Sinica. 1991 40(2): 182-189. Published 1991-01-05 Author(s): CHANG WEN-WEI, ZHANG LI-FU, SHAO FU-QIU <br/><p>In this paper, we discuss the physical mechanism of laser plasma wake wave and beat wave accelerators by means of theoretical analysis and particle simulation methods. The results show that: as long as laser plasma wave has Vph≈c and is strong enough, and with a proper transverse magnetic field applied, we may accelerate relativistic electrons to the order of magnitude of GeV within a distance of meters. We have also studied the problem of ES wave with low phase velocity generated by laser plasma Raman scattering to accelerate non-relativistic electrons by using particle simulation methods, and possibility of multistage, or multiwave, acceleration is explored as well. The results show that: taking the advantage of laser plasma wave accelerator, we will be able to get high energy electrons of the order of magnitude of Gev under ordinary laboratory conditions.</p> <br/>Acta Physica Sinica. 1991 40(2): 182-189. Published 1991-01-05 LASER PLASMA WAVE ELECTRON ACCELERATORS CHANG WEN-WEI, ZHANG LI-FU, SHAO FU-QIU 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 182-189. article doi:10.7498/aps.40.182 10.7498/aps.40.182 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.182 182-189 //m.getgobooth.com/en/article/doi/10.7498/aps.40.190 Author(s): TONG XIAO-MIN, LI JIA-MING <br/><p>Here we present a unified theory of above threshold ionization (ATI) phenomena. Based on this theory, we can describe ATI processes in realistic atomic screen potentials and can also elucidate experimental observations of ATI phenomena. The ATI phenomena mainly involve two successive procosses: (1) Quantum transition processe from an initial field-free state to final strong laser field dressed states. (2) in order to descibe experimental observations, one must consider post-interactions between the escaping photoelectron and the strong laser fields, which are classic processes owing to ponderomotive forces generated by non-uniform laser fields.</p> <br/>Acta Physica Sinica. 1991 40(2): 190-197. Published 1991-01-05 Author(s): TONG XIAO-MIN, LI JIA-MING <br/><p>Here we present a unified theory of above threshold ionization (ATI) phenomena. Based on this theory, we can describe ATI processes in realistic atomic screen potentials and can also elucidate experimental observations of ATI phenomena. The ATI phenomena mainly involve two successive procosses: (1) Quantum transition processe from an initial field-free state to final strong laser field dressed states. (2) in order to descibe experimental observations, one must consider post-interactions between the escaping photoelectron and the strong laser fields, which are classic processes owing to ponderomotive forces generated by non-uniform laser fields.</p> <br/>Acta Physica Sinica. 1991 40(2): 190-197. Published 1991-01-05 THEORY OF ABOVE THRESHOLD IONIZATION PHENOMENA IN INTENSE LASER FIELDS TONG XIAO-MIN, LI JIA-MING 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 190-197. article doi:10.7498/aps.40.190 10.7498/aps.40.190 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.190 190-197 //m.getgobooth.com/en/article/doi/10.7498/aps.40.198 Author(s): LIANG ER-JUN, ZHANG PENG-XIANG <br/><p>The interaction between riboflavin and silver colloidal particles was studied with absorption and surface enhanced resonant Raman spectroscopy (SERRS). It was found that flourescence interference was completely quenched while Raman scattering was significantly enhanced upon addition of silver sol into ri boflavin aqueous solution. Tentative assignment of Raman modes was given. SERRS sp ectra suggest that Ag complexation of riboflavin in silver sol dose not resemble the aqueous solution complex of Ag. In addition, Raman bands below 1000 cm-1, which are mostly related to ring breathing and C-H torsion out of plane, were also obtained.</p> <br/>Acta Physica Sinica. 1991 40(2): 198-204. Published 1991-01-05 Author(s): LIANG ER-JUN, ZHANG PENG-XIANG <br/><p>The interaction between riboflavin and silver colloidal particles was studied with absorption and surface enhanced resonant Raman spectroscopy (SERRS). It was found that flourescence interference was completely quenched while Raman scattering was significantly enhanced upon addition of silver sol into ri boflavin aqueous solution. Tentative assignment of Raman modes was given. SERRS sp ectra suggest that Ag complexation of riboflavin in silver sol dose not resemble the aqueous solution complex of Ag. In addition, Raman bands below 1000 cm-1, which are mostly related to ring breathing and C-H torsion out of plane, were also obtained.</p> <br/>Acta Physica Sinica. 1991 40(2): 198-204. Published 1991-01-05 ABSORPTION AND SURFACE ENHANCED RESONANT RAMAN SPECTRA OF RIBOFLAVIN IN SILVER COLLOID LIANG ER-JUN, ZHANG PENG-XIANG 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 198-204. article doi:10.7498/aps.40.198 10.7498/aps.40.198 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.198 198-204 //m.getgobooth.com/en/article/doi/10.7498/aps.40.205 Author(s): HAN RONG-DIAN, GUO XUE-ZHE, WENG HUI-MIN, SHI XING-JUN, XIE LI <br/><p>Positronium atoms are formed efficiently by slow positron beam hitting a solid target surface in vacuum. The fraction of positrons which formed positroniums is determined by applying the "peak method" to the energy spectra of the positron annihilation radiation measured at different target temperatures and incident positron energies. The fraction is dependent on the target material, temperature and incident positron energy. For germanium, the fraction is as high as 80%.</p> <br/>Acta Physica Sinica. 1991 40(2): 205-209. Published 1991-01-05 Author(s): HAN RONG-DIAN, GUO XUE-ZHE, WENG HUI-MIN, SHI XING-JUN, XIE LI <br/><p>Positronium atoms are formed efficiently by slow positron beam hitting a solid target surface in vacuum. The fraction of positrons which formed positroniums is determined by applying the "peak method" to the energy spectra of the positron annihilation radiation measured at different target temperatures and incident positron energies. The fraction is dependent on the target material, temperature and incident positron energy. For germanium, the fraction is as high as 80%.</p> <br/>Acta Physica Sinica. 1991 40(2): 205-209. Published 1991-01-05 PRODUCTION OF VACUUM POSITRONIUM ATOMS HAN RONG-DIAN, GUO XUE-ZHE, WENG HUI-MIN, SHI XING-JUN, XIE LI 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 205-209. article doi:10.7498/aps.40.205 10.7498/aps.40.205 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.205 205-209 //m.getgobooth.com/en/article/doi/10.7498/aps.40.210 Author(s): LIU ZHENG-DONG <br/><p>This paper studies the cavity field generated by injecting atoms, one at a time, initially in the excited state and operating at a one-step two-photon transition. The interesting features of photon statistical distribution in the cavity are found and discussed, the conditions of generating photon number state are shown.</p> <br/>Acta Physica Sinica. 1991 40(2): 210-218. Published 1991-01-05 Author(s): LIU ZHENG-DONG <br/><p>This paper studies the cavity field generated by injecting atoms, one at a time, initially in the excited state and operating at a one-step two-photon transition. The interesting features of photon statistical distribution in the cavity are found and discussed, the conditions of generating photon number state are shown.</p> <br/>Acta Physica Sinica. 1991 40(2): 210-218. Published 1991-01-05 CONDITION OF GENERATING PHOTON NUMBER STATE IN OPTICAL CAVITY LIU ZHENG-DONG 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 210-218. article doi:10.7498/aps.40.210 10.7498/aps.40.210 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.210 210-218 //m.getgobooth.com/en/article/doi/10.7498/aps.40.219 Author(s): ZHANG SHI-CHANG <br/><p>By making use of the parametric-amplif ier model, we analyse the effect of space-charge wave in Raman free-electron lasers. R esults show that without taking the initial transverse velocity into account, kwv20&lt;ωc is a necessary condition under which the scattered wave couples with the slow space-charge wave. The dispersion relation and gain of the scattered wave, as well as the matching condition between the scattered wave and the space-charge wave, are derived.</p> <br/>Acta Physica Sinica. 1991 40(2): 219-225. Published 1991-01-05 Author(s): ZHANG SHI-CHANG <br/><p>By making use of the parametric-amplif ier model, we analyse the effect of space-charge wave in Raman free-electron lasers. R esults show that without taking the initial transverse velocity into account, kwv20&lt;ωc is a necessary condition under which the scattered wave couples with the slow space-charge wave. The dispersion relation and gain of the scattered wave, as well as the matching condition between the scattered wave and the space-charge wave, are derived.</p> <br/>Acta Physica Sinica. 1991 40(2): 219-225. Published 1991-01-05 EFFECT OF SPACE-CHARGE WAVE IN RAMAN FREE-ELEC-TRON LASERS ZHANG SHI-CHANG 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 219-225. article doi:10.7498/aps.40.219 10.7498/aps.40.219 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.219 219-225 //m.getgobooth.com/en/article/doi/10.7498/aps.40.226 Author(s): WANG YING-HAI, HU CHENG-SHENG, WANG ZHI-CHENG <br/><p>By means of the semiclassical method, we discuss the bistability in a two-photon laser with injected signal for the homogeneously broadened single mode ring cavity. It is demonstrated that in the resonant case one can find bistable states in a two-photon laser with injected signal. In the limit of "good cavity" and "bad cavity", we give a simple description of bistability leading to a predictions for the transient behavior of the output light and the hysteresis cycle by adiabatically eliminating the fast variables. It is found that the approach to the stationary state is monotonic in the low-branch and is oscillatory in the high-branch, and a critical slowing down occurs where the output field changes discontinuousiy.</p> <br/>Acta Physica Sinica. 1991 40(2): 226-233. Published 1991-01-05 Author(s): WANG YING-HAI, HU CHENG-SHENG, WANG ZHI-CHENG <br/><p>By means of the semiclassical method, we discuss the bistability in a two-photon laser with injected signal for the homogeneously broadened single mode ring cavity. It is demonstrated that in the resonant case one can find bistable states in a two-photon laser with injected signal. In the limit of "good cavity" and "bad cavity", we give a simple description of bistability leading to a predictions for the transient behavior of the output light and the hysteresis cycle by adiabatically eliminating the fast variables. It is found that the approach to the stationary state is monotonic in the low-branch and is oscillatory in the high-branch, and a critical slowing down occurs where the output field changes discontinuousiy.</p> <br/>Acta Physica Sinica. 1991 40(2): 226-233. Published 1991-01-05 BISTABILITY IN A TWO-PHOTON LASER WITH INJECTED SIGNAL WANG YING-HAI, HU CHENG-SHENG, WANG ZHI-CHENG 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 226-233. article doi:10.7498/aps.40.226 10.7498/aps.40.226 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.226 226-233 //m.getgobooth.com/en/article/doi/10.7498/aps.40.234 Author(s): LIN ZUN-QI, HE XING-FA, ZHANG HUI-HUANG, WANG XIAO-QIN, ZHUANG YI-FEI, LIN KANG-CHUN, ZHAO ZHI-WEN, WEI XIAO-CHUN, SHI A-YING, TIAN LI, DAI MEI-LAN, SHEN XIAO-HUA, LI JIA-MING <br/><p>We present in this paper the temporally and spatially resolved feature of the side scattered 3ω0/2 harmonic emission, induced by A single laser spot with ten-micron-radius-scale in a preformed laser plasma. The close relation of the harmonic emission with such a small scale laser self-focusing filamentation has been discussed in detail. It is suggested that the side scattered harmonic signal from a underdense region as low as 0.05nc may be caused by the Lang-muir wave and/or ion-acoustic wave scattering induced by laser dynamic filamentation.</p> <br/>Acta Physica Sinica. 1991 40(2): 234-242. Published 1991-01-05 Author(s): LIN ZUN-QI, HE XING-FA, ZHANG HUI-HUANG, WANG XIAO-QIN, ZHUANG YI-FEI, LIN KANG-CHUN, ZHAO ZHI-WEN, WEI XIAO-CHUN, SHI A-YING, TIAN LI, DAI MEI-LAN, SHEN XIAO-HUA, LI JIA-MING <br/><p>We present in this paper the temporally and spatially resolved feature of the side scattered 3ω0/2 harmonic emission, induced by A single laser spot with ten-micron-radius-scale in a preformed laser plasma. The close relation of the harmonic emission with such a small scale laser self-focusing filamentation has been discussed in detail. It is suggested that the side scattered harmonic signal from a underdense region as low as 0.05nc may be caused by the Lang-muir wave and/or ion-acoustic wave scattering induced by laser dynamic filamentation.</p> <br/>Acta Physica Sinica. 1991 40(2): 234-242. Published 1991-01-05 SELF-FOCUSING AND HARMONIC EMISSION EFFECT INDU-CED BY TEN-MICRON-SMALL-SCALE LASER SPOT IN PLASMAS LIN ZUN-QI, HE XING-FA, ZHANG HUI-HUANG, WANG XIAO-QIN, ZHUANG YI-FEI, LIN KANG-CHUN, ZHAO ZHI-WEN, WEI XIAO-CHUN, SHI A-YING, TIAN LI, DAI MEI-LAN, SHEN XIAO-HUA, LI JIA-MING 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 234-242. article doi:10.7498/aps.40.234 10.7498/aps.40.234 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.234 234-242 //m.getgobooth.com/en/article/doi/10.7498/aps.40.243 Author(s): WU YING <br/><p>In this paper, the theory of degenerate and nearly degenerate four wave mixing in plasmas in transmission geometry is investigated. The universal set of four wave nonlinear coupled equations is obtained and its exact solution is found. The theoy can be helpful in developing various high speed nonlinear optical devices in the range of microwave frequencies.</p> <br/>Acta Physica Sinica. 1991 40(2): 243-252. Published 1991-01-05 Author(s): WU YING <br/><p>In this paper, the theory of degenerate and nearly degenerate four wave mixing in plasmas in transmission geometry is investigated. The universal set of four wave nonlinear coupled equations is obtained and its exact solution is found. The theoy can be helpful in developing various high speed nonlinear optical devices in the range of microwave frequencies.</p> <br/>Acta Physica Sinica. 1991 40(2): 243-252. Published 1991-01-05 THEORY OF DEGENERATE AND NEARLY DEGENERATE FOUR-WAVE MIXING IN PLASMAS——IN THE CASE OF TRANSMISSION GRATING CONFIGURATION WU YING 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 243-252. article doi:10.7498/aps.40.243 10.7498/aps.40.243 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.243 243-252 //m.getgobooth.com/en/article/doi/10.7498/aps.40.253 Author(s): ZHU MEI-FANG, ZONG JUN, ZHANG XIU-ZEN <br/><p>The effects of nitrogen content on the interfacial properties in a-Si:H/a-SiNx:H superlat-tices have been studies by electroabsorption (EA) photothermal deflection spectroscopy (PDS), photoluminescence (PL) and infrared (IR). The density of interface charges Qs deduced from EA is approximately 1012cm-2. The density of interface states Ni estimated by PDS is ～1011cm-2 which is smaller by a factor of 5 than Qs. The nitrogen content x dependences of Qs, Ni and the relative peak intensity of luminescence Ipl exhibit similar behavior and show extreme values at x=xc which is defined as critical value of nitrigen content. The critical values of nitrogen content are in the x range of 0.85-0.95. The measurements of IR reveal that the absorption of N-H bonds increases rapidly with increasing x in the range of 0.6-1.0. The asymmetry of interfaces and a possible mechanism of presence of critical values are discussed-For interpretating the phenomena observed, a model of charged nitrogen dangling bond is suggested.</p> <br/>Acta Physica Sinica. 1991 40(2): 253-261. Published 1991-01-05 Author(s): ZHU MEI-FANG, ZONG JUN, ZHANG XIU-ZEN <br/><p>The effects of nitrogen content on the interfacial properties in a-Si:H/a-SiNx:H superlat-tices have been studies by electroabsorption (EA) photothermal deflection spectroscopy (PDS), photoluminescence (PL) and infrared (IR). The density of interface charges Qs deduced from EA is approximately 1012cm-2. The density of interface states Ni estimated by PDS is ～1011cm-2 which is smaller by a factor of 5 than Qs. The nitrogen content x dependences of Qs, Ni and the relative peak intensity of luminescence Ipl exhibit similar behavior and show extreme values at x=xc which is defined as critical value of nitrigen content. The critical values of nitrogen content are in the x range of 0.85-0.95. The measurements of IR reveal that the absorption of N-H bonds increases rapidly with increasing x in the range of 0.6-1.0. The asymmetry of interfaces and a possible mechanism of presence of critical values are discussed-For interpretating the phenomena observed, a model of charged nitrogen dangling bond is suggested.</p> <br/>Acta Physica Sinica. 1991 40(2): 253-261. Published 1991-01-05 THE EFFECTS OF NITROGEN CONTENT OF a-SiNx:H ON THE INTERFACE PROPERTIES IN a-Si:H/a-SiNx:H SUPERLATTICES ZHU MEI-FANG, ZONG JUN, ZHANG XIU-ZEN 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 253-261. article doi:10.7498/aps.40.253 10.7498/aps.40.253 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.253 253-261 //m.getgobooth.com/en/article/doi/10.7498/aps.40.262 Author(s): ZHENG FU-QIAN <br/><p>The dynamic viscosity and the steady-state viscosity are measured for the metallic glass Ni30Zr70. The dynamic viscosity increases linearly with the decrease of the heating rate as a result of the structural relaxation, and the temperature dependence of the dynamic viscosity can be described by the Arrhenius equation in the temperature range below Tg. The temperature dependence of the steady-state viscosity satisfies the Fulcher-Vogel equation at temperatures below Tg. From the high temperature at temperature of the onset of crystallization dynamic viscosity values with four heating rates, the equilibrium viscosity is determined. Over the temperature range of 63C to 670K, the temperature dependence of the equilibrium viscosity is well described by the Fulcher-Vogel equation.</p> <br/>Acta Physica Sinica. 1991 40(2): 262-268. Published 1991-01-05 Author(s): ZHENG FU-QIAN <br/><p>The dynamic viscosity and the steady-state viscosity are measured for the metallic glass Ni30Zr70. The dynamic viscosity increases linearly with the decrease of the heating rate as a result of the structural relaxation, and the temperature dependence of the dynamic viscosity can be described by the Arrhenius equation in the temperature range below Tg. The temperature dependence of the steady-state viscosity satisfies the Fulcher-Vogel equation at temperatures below Tg. From the high temperature at temperature of the onset of crystallization dynamic viscosity values with four heating rates, the equilibrium viscosity is determined. Over the temperature range of 63C to 670K, the temperature dependence of the equilibrium viscosity is well described by the Fulcher-Vogel equation.</p> <br/>Acta Physica Sinica. 1991 40(2): 262-268. Published 1991-01-05 DYNAMIC AND STEADY-STATE VISCOSITY OF THE META-LLIC GLASS Ni30Zr70 ZHENG FU-QIAN 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 262-268. article doi:10.7498/aps.40.262 10.7498/aps.40.262 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.262 262-268 //m.getgobooth.com/en/article/doi/10.7498/aps.40.269 Author(s): YANG ZONG-XIAN, ZHANG TAO <br/><p>One-dimensional tight-binding model and the one-electron chemisorption theory are used to calculate the chemisorption energy of CO or O on NixCu1-x surface under the average T-matrix approximation. It is found that the chemisorption of CO and O on NixCu1-x are strengthened with the increase of bulk Ni concentration. The Cu segragation to the NiCu alloy surface may weaken the chemisorption.</p> <br/>Acta Physica Sinica. 1991 40(2): 269-274. Published 1991-01-05 Author(s): YANG ZONG-XIAN, ZHANG TAO <br/><p>One-dimensional tight-binding model and the one-electron chemisorption theory are used to calculate the chemisorption energy of CO or O on NixCu1-x surface under the average T-matrix approximation. It is found that the chemisorption of CO and O on NixCu1-x are strengthened with the increase of bulk Ni concentration. The Cu segragation to the NiCu alloy surface may weaken the chemisorption.</p> <br/>Acta Physica Sinica. 1991 40(2): 269-274. Published 1991-01-05 CO AND O CHEMISORPTION ON DISORDERED BINARY ALLOY NiCu YANG ZONG-XIAN, ZHANG TAO 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 269-274. article doi:10.7498/aps.40.269 10.7498/aps.40.269 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.269 269-274 //m.getgobooth.com/en/article/doi/10.7498/aps.40.275 Author(s): ZHONG ZHAN-TIAN, WANG DA-WEN, LIAO XIAN-BO, FAN YUE, LI CHENG-FANG, MOU SHAN-MING <br/><p>The Au/a-Si:H contact has been investigated by XPS and AES. It is found that the metal cluster occurs, at initial formation process of Au/a-Si:H interface, and after exceeding the critical Au deposition value, the Vinterdiffusion and chemical reaction of Au and Si begin and Au-Si intermixing region is formed. Furthermore, the experimental results of photoemission study confirm that Si islands are formed after annealing the interface of Au/a-Si:H.</p> <br/>Acta Physica Sinica. 1991 40(2): 275-280. Published 1991-01-05 Author(s): ZHONG ZHAN-TIAN, WANG DA-WEN, LIAO XIAN-BO, FAN YUE, LI CHENG-FANG, MOU SHAN-MING <br/><p>The Au/a-Si:H contact has been investigated by XPS and AES. It is found that the metal cluster occurs, at initial formation process of Au/a-Si:H interface, and after exceeding the critical Au deposition value, the Vinterdiffusion and chemical reaction of Au and Si begin and Au-Si intermixing region is formed. Furthermore, the experimental results of photoemission study confirm that Si islands are formed after annealing the interface of Au/a-Si:H.</p> <br/>Acta Physica Sinica. 1991 40(2): 275-280. Published 1991-01-05 XPS AND AES STUDY FOR Au/a-Si:H INTERFACE ZHONG ZHAN-TIAN, WANG DA-WEN, LIAO XIAN-BO, FAN YUE, LI CHENG-FANG, MOU SHAN-MING 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 275-280. article doi:10.7498/aps.40.275 10.7498/aps.40.275 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.275 275-280 //m.getgobooth.com/en/article/doi/10.7498/aps.40.281 Author(s): LI ZHENG-ZHONG, XU WANG, ZHOU QING-CHUN <br/><p>The electrical resistivity of the heavy-fer mion alloy system is calculated through the Yoshimori-Kasai model with the application of the slave-boson technique. The residual resistivity of the system is found in the mean-field approximation by using the CPA method-The low-temperature resistivity maximum in the concentrated alloy is aslo obtained as the Gaussian fluctuation of the slave-boson field is included.</p> <br/>Acta Physica Sinica. 1991 40(2): 281-288. Published 1991-01-05 Author(s): LI ZHENG-ZHONG, XU WANG, ZHOU QING-CHUN <br/><p>The electrical resistivity of the heavy-fer mion alloy system is calculated through the Yoshimori-Kasai model with the application of the slave-boson technique. The residual resistivity of the system is found in the mean-field approximation by using the CPA method-The low-temperature resistivity maximum in the concentrated alloy is aslo obtained as the Gaussian fluctuation of the slave-boson field is included.</p> <br/>Acta Physica Sinica. 1991 40(2): 281-288. Published 1991-01-05 ELECTRICAL RESISTIVITY OF THE WEAK-DISPERSION HEAVY-FERMION ALLOY MODEL LI ZHENG-ZHONG, XU WANG, ZHOU QING-CHUN 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 281-288. article doi:10.7498/aps.40.281 10.7498/aps.40.281 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.281 281-288 //m.getgobooth.com/en/article/doi/10.7498/aps.40.289 Author(s): YANG BING-LIANG, LIU BAI-YONG, CHEN DOU-NAN, Y. C. CHENG <br/><p>The microstructure and current transport behavior in the thermally nitrided silicon oxide (SiOxNy) thin films have been studied and a new model is proposed to explain the current transport behavior of the films. In particular, the model includes the case in which the external applied high field rises up to the value just before the occurance of intrinsic breakdown. The theoretical result of the new model agrees well with the experiment. Finally, the significant current enhancement and trapping ledge phenomenon in the I-V characteristics of the films have been explained satisfactorily using this new model, and the influences of the external applied field and the electron trap on the current transport behavior in the films are also discussed.</p> <br/>Acta Physica Sinica. 1991 40(2): 289-296. Published 1991-01-05 Author(s): YANG BING-LIANG, LIU BAI-YONG, CHEN DOU-NAN, Y. C. CHENG <br/><p>The microstructure and current transport behavior in the thermally nitrided silicon oxide (SiOxNy) thin films have been studied and a new model is proposed to explain the current transport behavior of the films. In particular, the model includes the case in which the external applied high field rises up to the value just before the occurance of intrinsic breakdown. The theoretical result of the new model agrees well with the experiment. Finally, the significant current enhancement and trapping ledge phenomenon in the I-V characteristics of the films have been explained satisfactorily using this new model, and the influences of the external applied field and the electron trap on the current transport behavior in the films are also discussed.</p> <br/>Acta Physica Sinica. 1991 40(2): 289-296. Published 1991-01-05 MICROSTRUCTURE OF SiOxNy THIN FILMS AND A NEW MODEL FOR THE CURRENT TRANSPORT MECHANISM YANG BING-LIANG, LIU BAI-YONG, CHEN DOU-NAN, Y. C. CHENG 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 289-296. article doi:10.7498/aps.40.289 10.7498/aps.40.289 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.289 289-296 //m.getgobooth.com/en/article/doi/10.7498/aps.40.297 Author(s): CHEN XIAN-HUI, CHEN ZU-YAO, QIAN YI-TAI, GU ZHEN-TIAN, CHENG XIANG-AI, SHA JIAN, WANG KE-QIN, ZHANG QI-RUI <br/><p>High-quality single phase polycrystalline sample of 110K superconductor (Bi,Pb)2Sr2Ca2Cu3Oy was prepared, the temperature of zero resistance of which is 107K. In this paper, the formation and transformation of the 2201, 2212 and 2223 phase, and the influence of quenching temperature are discussed. The measurement of complex susceptibility shows the strength of Josephson coupling among the superconducting grains depends on the process of sample preparation. The specific heat jump is △c(107K) =5.3J/molK, and the Sommerfeld cntant is γ = 34.6mJ/molK. The specific heat jump is related to the heat treatment of samples strongly. The eletron diffraction analysis and measurement of the oxygen content of these samples are made. The relationship between the oxygen content and the superconducting volume fraction is also discussed.</p> <br/>Acta Physica Sinica. 1991 40(2): 297-302. Published 1991-01-05 Author(s): CHEN XIAN-HUI, CHEN ZU-YAO, QIAN YI-TAI, GU ZHEN-TIAN, CHENG XIANG-AI, SHA JIAN, WANG KE-QIN, ZHANG QI-RUI <br/><p>High-quality single phase polycrystalline sample of 110K superconductor (Bi,Pb)2Sr2Ca2Cu3Oy was prepared, the temperature of zero resistance of which is 107K. In this paper, the formation and transformation of the 2201, 2212 and 2223 phase, and the influence of quenching temperature are discussed. The measurement of complex susceptibility shows the strength of Josephson coupling among the superconducting grains depends on the process of sample preparation. The specific heat jump is △c(107K) =5.3J/molK, and the Sommerfeld cntant is γ = 34.6mJ/molK. The specific heat jump is related to the heat treatment of samples strongly. The eletron diffraction analysis and measurement of the oxygen content of these samples are made. The relationship between the oxygen content and the superconducting volume fraction is also discussed.</p> <br/>Acta Physica Sinica. 1991 40(2): 297-302. Published 1991-01-05 PHASE TRANSFORMATION AND SUPERCONDUCTIVITY OF 110K SUPERCONDUCTOR IN (Bi, Pb)-Sr-Ca-Cu-O SYSTEM CHEN XIAN-HUI, CHEN ZU-YAO, QIAN YI-TAI, GU ZHEN-TIAN, CHENG XIANG-AI, SHA JIAN, WANG KE-QIN, ZHANG QI-RUI 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 297-302. article doi:10.7498/aps.40.297 10.7498/aps.40.297 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.297 297-302 //m.getgobooth.com/en/article/doi/10.7498/aps.40.303 Author(s): MEI LIANG-MO, LI WEI-DONG, BI SI-YUN, LIU YI-HUA <br/><p>The compositionally modulated FeBSi/Si amorphous films were prepared by rf sputtering. The saturation magnetization of modulated films decreases exponentially with increase of the thickness of Si layers. This is caused by the dead layers. The M?ssbauer spectra measurements showed that the dead layers are the paramagnetic phase formed by the interdiffusion of Fe and Si atoms at the interfaces. The size effect was observed in the FeBSi/Si films. The size effect depends only on the thickness of FeBSi layers, and the dead layer effect depends on both the FeBSi layer thickness and Si layer thickness.</p> <br/>Acta Physica Sinica. 1991 40(2): 303-309. Published 1991-01-05 Author(s): MEI LIANG-MO, LI WEI-DONG, BI SI-YUN, LIU YI-HUA <br/><p>The compositionally modulated FeBSi/Si amorphous films were prepared by rf sputtering. The saturation magnetization of modulated films decreases exponentially with increase of the thickness of Si layers. This is caused by the dead layers. The M?ssbauer spectra measurements showed that the dead layers are the paramagnetic phase formed by the interdiffusion of Fe and Si atoms at the interfaces. The size effect was observed in the FeBSi/Si films. The size effect depends only on the thickness of FeBSi layers, and the dead layer effect depends on both the FeBSi layer thickness and Si layer thickness.</p> <br/>Acta Physica Sinica. 1991 40(2): 303-309. Published 1991-01-05 MAGNETIC PROPERTIES AND CONVERSION ELECTRON M?SSBAUER SPECTROSCOPY OF COMPOSITIONALLY MODULATED FeBSi/Si AMORPHOUS FILMS MEI LIANG-MO, LI WEI-DONG, BI SI-YUN, LIU YI-HUA 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 303-309. article doi:10.7498/aps.40.303 10.7498/aps.40.303 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.303 303-309 //m.getgobooth.com/en/article/doi/10.7498/aps.40.310 Author(s): ZHANG SHENG-LIANG, ZHAI HONG-RU <br/><p>M?ssbauer spectra were taken at 4.2 K and 290 K for the bcc and fee Fe1-xPdx alloys produced by vapor quenching. The hyperfine interaction parameters and hyperfine field distribution curves were obtained with spectrum fitting method. With increasing x, the average hyperfine field, Hhf increases in bcc Fe1-xPdx alloys, while Hhf decreases in fee alloys. The concentration dependence of Hhf can be explained by using a semi-empirical formula.</p> <br/>Acta Physica Sinica. 1991 40(2): 310-315. Published 1991-01-05 Author(s): ZHANG SHENG-LIANG, ZHAI HONG-RU <br/><p>M?ssbauer spectra were taken at 4.2 K and 290 K for the bcc and fee Fe1-xPdx alloys produced by vapor quenching. The hyperfine interaction parameters and hyperfine field distribution curves were obtained with spectrum fitting method. With increasing x, the average hyperfine field, Hhf increases in bcc Fe1-xPdx alloys, while Hhf decreases in fee alloys. The concentration dependence of Hhf can be explained by using a semi-empirical formula.</p> <br/>Acta Physica Sinica. 1991 40(2): 310-315. Published 1991-01-05 M?SSBAUER EFFECT OF VAPOR QUENCHED Fe-Pd ALLOYS ZHANG SHENG-LIANG, ZHAI HONG-RU 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 310-315. article doi:10.7498/aps.40.310 10.7498/aps.40.310 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.310 310-315 //m.getgobooth.com/en/article/doi/10.7498/aps.40.316 Author(s): WANG ZHEN-XIA, PAN JI-SHENG, TAO ZHEN-LAN, ZHANG JI-PING, ZHANG HUI-MING, ZHANG WEI-PING, LU ZHAO-LUN <br/><p>The angular distributions of sputtered atoms of cadmium have been measured with 27 keV Ar+ ion bombardment at normal incidence with different target temperature by using collector technique and RBS analysis. After the sputtering experiment the surface structures have been observed using scanning electron microscope. For all samples the angular distributions are over-cosine. However, the values of the deviation △ from the cosine distribution at the axis of polar angle of 0°is not all the same. The deviation △T at the target temperature of 150℃ △R is smaller than that at room teperature. ie. △TR. A simple model is proposed to explain the formation of pattern of angular distribution.</p> <br/>Acta Physica Sinica. 1991 40(2): 316-322. Published 1991-01-05 Author(s): WANG ZHEN-XIA, PAN JI-SHENG, TAO ZHEN-LAN, ZHANG JI-PING, ZHANG HUI-MING, ZHANG WEI-PING, LU ZHAO-LUN <br/><p>The angular distributions of sputtered atoms of cadmium have been measured with 27 keV Ar+ ion bombardment at normal incidence with different target temperature by using collector technique and RBS analysis. After the sputtering experiment the surface structures have been observed using scanning electron microscope. For all samples the angular distributions are over-cosine. However, the values of the deviation △ from the cosine distribution at the axis of polar angle of 0°is not all the same. The deviation △T at the target temperature of 150℃ △R is smaller than that at room teperature. ie. △TR. A simple model is proposed to explain the formation of pattern of angular distribution.</p> <br/>Acta Physica Sinica. 1991 40(2): 316-322. Published 1991-01-05 A RESEARCH OF THE CORRELATION BETWEEN SURFACE TOPOGRAPHY AND ANGULAR DISTRIBUTION OF SPUTTERED ATOMS WANG ZHEN-XIA, PAN JI-SHENG, TAO ZHEN-LAN, ZHANG JI-PING, ZHANG HUI-MING, ZHANG WEI-PING, LU ZHAO-LUN 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 316-322. article doi:10.7498/aps.40.316 10.7498/aps.40.316 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.316 316-322 //m.getgobooth.com/en/article/doi/10.7498/aps.40.323 Author(s): HUANG WEI-DONG, SHANG BAO-LU, ZHOU YAO-HE <br/><p>Time-dependent development of interface morphology from initial perturbation of a planar interface to a steady periodic array of cells or dendrites was directly observed during directional solidification brocess of a transparent model alloy, succinonitrile -1.1 wt% ethanol. The following results are obtained: 1) The measured wavelength of initial perturbation of planar interface instability is within the expected wavelength range by the MS theory, but not the same as the expected wavelength with the fastest amplitude developing speed. 2) During the initial stage of a planar interface instability, the developing speed of perturbation amplitude is indeed a linear function of the amplitude, but the measured value of the amplitude developing rate is much smaller than the theoretical value. 3) The features of morphology development of cells and dendrites are different from each other, and the main cause leading to the different developing behaviour is that the relative scale of the steady primary spacing and the initial perturbation wavelength is different in the two cases.</p> <br/>Acta Physica Sinica. 1991 40(2): 323-328. Published 1991-01-05 Author(s): HUANG WEI-DONG, SHANG BAO-LU, ZHOU YAO-HE <br/><p>Time-dependent development of interface morphology from initial perturbation of a planar interface to a steady periodic array of cells or dendrites was directly observed during directional solidification brocess of a transparent model alloy, succinonitrile -1.1 wt% ethanol. The following results are obtained: 1) The measured wavelength of initial perturbation of planar interface instability is within the expected wavelength range by the MS theory, but not the same as the expected wavelength with the fastest amplitude developing speed. 2) During the initial stage of a planar interface instability, the developing speed of perturbation amplitude is indeed a linear function of the amplitude, but the measured value of the amplitude developing rate is much smaller than the theoretical value. 3) The features of morphology development of cells and dendrites are different from each other, and the main cause leading to the different developing behaviour is that the relative scale of the steady primary spacing and the initial perturbation wavelength is different in the two cases.</p> <br/>Acta Physica Sinica. 1991 40(2): 323-328. Published 1991-01-05 AN EXPERIMENTAL STUDY OF MORPHOLOGY DEVELOP-MENT OF SOLIDIFICATION INTERFACE HUANG WEI-DONG, SHANG BAO-LU, ZHOU YAO-HE 1991-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(2): 323-328. article doi:10.7498/aps.40.323 10.7498/aps.40.323 Acta Physica Sinica 40 2 1991-01-05 //m.getgobooth.com/en/article/doi/10.7498/aps.40.323 323-328