bluuebunny/crossref_metadata_2025 huggingface dataset:
TRANSMISSION MATRIX OF POLARIZATION HOLOGRAMS IN THE PHOTO-INDUCED ANISOTROPIC RECORDING MATERIAL
Authors: YU MEI-WEN  , ZHANG CUN-LIN  ,   北京理工大学,北京100081
Published: November 2020

The optical parameter distribution can be determined when the polarization state and phase difference of the object wave and reference wave are given. Thus, the polarization hologram can be regarded as a complex polarizing element. According to the matrix theory of the polarizing element, the transmission matrix of polarization holograms can be found. The Jones vectors of the reconstructing wave can be found by the product of the Jones vectors of the illumination light and the transmission matrix of polarization holograms.
PHASE FLUCTUATIONS IN JAYNES-CUMMINGS MODEL WITH AND WITHOUT ROTATION WAVE APPROXIMATION
Authors: LI GAO-XIANG  , PENG JIN-SHENG  ,   华中师范大学物理系,武汉430070
Published: November 2020

In this paper, we have respectively investigated the time evolution of the phase operator of radiation field in the Jaynes-Cummings model with and without RWA. We verified that the atomic Rabi oscillation leads to the phase dissipation of radiation field by analytical method, and the effect of virtual field can exhibit the quantum fluctuations of system and leads to the frequency shift of radiation field.
ATOMIC CORRELATIONS IN AMORPHOUS Si AND Ge AND STRUCTURAL MODEL
Authors: WANG DE-HE  ,   北京大学微电子学研究所,北京100871
Published: November 2020

This paper analyses the atomic correlations in crystalline and amorphous Si and Ge and discusses their relationship. Expressions for the atomic correlations are presented. On the basis of the theory, a 400-atom structural model for a-Ge has been constructed. The main characteristics of the model are in good agreement with experimental results.
ELECTRONIC STRUCTURE OF MOLECULAR RYDBERG STATES OF DIATOMIC MOLECULES WITH Si AS THEIR UNITED ATOM
Authors: SUN BIAO  , LI JIA-MING  ,   中国科学院物理研究所,北京100080
Published: November 2020

Based on the independent-particle-approximation (i.e. the multiple scattering self-consistent-field theory), we studied the electronic structures of Rydberg series of the diatomic molecules with Si as their united atom, such as N2, CO, BF, A1H, LiNa, "BeNe" and "MgHe". The principal quantum number of the first state of the Rydberg series is determined from the limit atom of the molecular elecronic configuration. The dynamics of the excited molecules has been elucidated. Our theoretical results prove to be in fair agreement with the existing experimental measurements, thus it can provide a reliable basis for future refined calculations such as the configuation interaction methods.
TOTAL CROSS SECTION MEASUREMENTS FOR ELECTRON SCATTERING ON N2 IN THE ENERGY RANGE 250-1400 eV
Authors: CHEN XIANG-JUN  , FAN XIAO-WEI  , XU KE-ZUN  , YANG BING-XIN  , XING SHI-LIN  , WANG YONG-GANG  , ZHANG FANG  ,   中国科学技术大学近代物理系,合肥230026
Published: November 2020

A linear-transmission-type apparatus for measuring total cross sections of electron scattering by atoms and molecules has been set up. Measurements on N2 have been carried out for 250-1400eV electrons with an accuracy of 3.5%. The results have been compared with available experimental and theoretical values of the total cross section.
REDUCED FORM AND EIGENMODE SOLUTION OF GENERALIZED MHD EQUATIONS IN A CYLINDRICAL PLASMA
Authors: YANG WEI-HONG  , HU XI-WEI  ,   中国科学技术大学近代物理系,合肥230026
Published: November 2020

In this paper, the reduced form (four differential equations of the first order) of generalized MHD equations is obtained, only some approximations satisfied by the experimental condition of heating tokamak plasma are used. An analytical dispersion relation (eigenmode solution) for a homogeneous plasma cylinder is obtained. It is shown that Appert's theory is a limiting case of our theory.
SCANNING TUNNELING MICROSCOPY INVESTIGATION OF GOLD-ION BOMBARDMENT DAMAGES ON GRAPHITE SURFACE
Authors: YAN JUN-JUE  , BAI CHUAN-YONG  , YANG WEI-SHENG  , WANG YU-GANG  , ZHAO WEI-JIANG  , YU FU-CHUN  , ZHAI PENG-JI  , TANG XIAO-WEI  ,   (1)北京大学技术物理系,北京100871; (2)北京大学物理系,北京100871; (3)中国科学院高能物理研究所,北京100080
Published: November 2020

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.
FLUORESCENCE AND LIFETIME MEASUREMENT FOR RuI
Authors: HUANG WEN  , XU XIANG-YUAN  , ZHAO WEN-ZHEN  , YU JIANG-CHEN  , CHEN DIE-YAN  ,   清华大学现代应用物理系,北京,100084
Published: November 2020

A fluorescence detection system is described in this paper. By means of thermal atomization and laser resonance excitation technique, the system can measure the lifetimes of atomic fluorescence of refractory metals and therefore the lifetimes of the atomic energy levels. The measured lifetime of Rul energy level [4d65s(6D)5p]7P40 is 70.4(±5%)ns.
INFLUENCE OF THE VIRTUAL PHOTON FIELD ON THE PERIODIC DECAY AND REVIVAL EFFECT OF AN ATOM
Authors: PENG JIN-SHENG  , LI GAO-XIANG  , ZHOU PENG  ,   (1)湖北教育学院物理系,武汉,430060; (2)华中师范大学物理系,武汉,430070
Published: November 2020

In this paper, we investigate the time evolution of the atomic operators of a two-level atom interacting with the field via a two-photon process within and without the rotating-wave approximation (RWA) by means of non-relativestic QED. We also verified that the virtual photon field is the cause for quantum chaos embodied by the periodic decay and revival effect of the atom using the numerical and analytic methods, and discussed the reason of neglecting the in-fluence of the virtual photon field on the revival time.
JAYNES-CUMMINGS MODEL OF TWO CASCADE THREE-LEVEL ATOMS AND ITS NONLINEAR PROPERTY
Authors: LIU SAN-QIU  , LIU ZHENG-DONG  , LI FU-QUAN  , CAO CHANC-QI  ,   (1)北京大学物理系,北京,100871; (2)江西师范大学物理系,南昌,330027
Published: November 2020

In this paper, we have studied the nonlinear interaction of two cascade three-level atoms with single mode field. The results show that the cooperative emission of two atoms can translate into synchronous when the strength of exciting field reaches a certain threshold, That is self-organization may occur in many-atom system to form a "large atom system" at the thre-shold, producing synchronous ordered emission Meanwhile, the second-order correlation degree of two-atom system is larger than that of single atom system due to the synchronous emission effect, i.e. bunching is strong but antibunching is weak. Moreover, the deeper squeezing of two-atom system is obtained since many-photon processes become stronger, and the stren-gth of exciting field is reguired to be also stronger.
KEPLER ORBITS FOLLOWED BY HYDROGEN ATOMS IN COHERENT STATES
Authors: XU BO-WEI  , GU WEI-HUA  ,   上海交通大学应用物理系,上海200030
Published: November 2020

Transforming the Coulomb problem to harmonic osillator, we construct nonspreading coherent states for the 2D and 3D hydrogen atom and show that the expectation values of the observables in Q. M. follow the classical Kepler orbits in physical space. The use of a fictitious time variable in the associated auxiliary osillator problem plays a crucial role.
TEMPERATURE DEPENDENCE OF DEUTERON-NUCLEUS SELF-CONSISTENT MICROSCOPIC OPTICAL POTENTIALS
Authors: SHI JIAN-QING  ,   浙江省技术物理应用研究所,杭州310012
Published: November 2020

Under the assumption on the temperature independence of the parameters of the Skyrme interactions, the formula of deuteron-nucleus self-consistent microscopic optical potentials are derived with the utilization of the mass operator method of Green function and the semi-classical variation approach. The temperature dependence of d+40Ca and d+90Zr optical potentials at different energies is discussed.
A STUDY ON LATTICE VIBRATION IN ONE DIMENSIONAL QUASI LATTICE
Authors: XU WEN-LAN  ,   中国科学院上海技术物理研究所红外物理开放研究实验室,上海,200083
Published: November 2020

The properties of vibrational states lor one-dimensional quasi-lattice, specially, properties of critical states are studied. Some methods describing different vibrational states are given.
MULTIPHONON TRANSITION AND TEMPERATURE DEPEN-DENCE OF PHOTOLUMINESCENCE SPECTRA OF DYE J-AGGREGATE LANGMIUR-BLODGETT FILMS
Authors: LIANG PEI-HUI  , ZHANG WEI-QING  , A. MüLLER  ,   (1)Max-Planck-lnstitut fur Biophysikalische Chemic,Gotiingcn,F. R. G.; (2)中国科学院上海光学精密机械研究所,上海,800211
Published: November 2020

In temperature range of 20K to 300K, we measuded photoluminescence spectra of heterogeneous J-aggregate Langmiur-Blodgett (LB) films made of three kinds of cyanine dye. With temperature reduced, while the intensity of J-peak, the zero phonon line increased, anomalous enhancement of the phonon sideband was observed. Analysis shows that J-aggregatc LB films are of characteristics like that of low dimensional crystal, they have strong phonon coupling, and nonradiative transition plays important role.
STUDY ON THE STRUCTURE、THE ELECTRICAL PROPER-TIES AND THE CONDUCTION MECHANISM OF THE POLYCRYSTAL MULTIPHASE MATERIAL Li2Mo2-xWxO6
Authors: CUI WAN-QIU  , SHEN ZHI-QI  , ZHOU DE-BAO  ,   武汉工业大学材料科学系,武汉,430070
Published: November 2020

The poly crystal multiphase creamics material Li2Mo2-xWxO6 with high conductivity is prepared in reducing atomsphere. By X-ray diffraction, EDX graph, 1R and ESR spectra, it is determined that the sample material is composed of two phases, i.e., Li2Mo1-xWxO4 and MoO2. The addition of tungsten mainly replaces molybdenum in the Li2MoO4 lattice. The electrical properties are studied by a.c. admi tance bridge method and a.c. complex impedance spectroscopy. The conductivity of the sample (x = 0.3) is σ27℃ =1.42×10-2(Ωcm)-1, σ300℃=2.86×10-2(Ωcm)-1. The conductivity increases and the ionic conduction activation energy decreases with increasing tungsten content. The microstructure model and the ionic conduction mechanism are given in this paper.
PRESSURE RESPONES OF CONFIGURATION ENTROPY AND INFORMATION DIMENSION IN AMORPHOUS IRON
Authors: QU SHI-XIAN  , SHEN ZHONG-YI  ,   (1)西安石油学院基础部,西安710061; (2)中国科学院物理研究所,北京100080
Published: November 2020

The pressure respones of Configuration entropy and information dimension of atomic energy distribution in amorphous iron is aralysed We calculate the particle number distribution of atomic energy, and take the information entropy of it as the configuration entropy of the amorphous structure. The calculated results suggest that the atomic energy distribution curve and the configuration entropy are relate to the energy interual in statistics, e. g., there is a fractal scaling ruler between configuration entropy and the interval. The configuration entropy is determined by the average value of it in no scaling distribution range of atomic energy between lower bound and upper bound. The results of simulation indicate that information dimension is another efficient parameter to describe the degree of disorder in amorphous system, and the effects of pressure on fractal dimension and the degree of structural disorder in amouphous structure show complicated behavior.
INTERACTION BETWEEN Li ATOMS ON Si(100)2×1 AND PHASE CHANGE OF SURFACE STRUCTURE
Authors: CAO PEI-LIN  , ZHOU XU-YAN  , ZHOU RU-HONG  ,   浙江大学物理系,杭州,310027
Published: November 2020

Using ASED-MO method and cluster models, the chemisorption energy of Li on Si(l00) 2×1 surface and the interaction between two adsorbed Li atoms are calculated. A new model which can be used to explain the transition from Si(100)-Li(2×1) to Li(l×l) in the 1 mono-layer range is proposed.
STUDY ON SOLID STATE REACTION INTERDIFFUSION OF Fe-Ti MULTILAYER MODULATED FILMS WITH DYNAMIC IN SITU X-RAY DIFFRACTION
Authors: BAI HAI-YANG  , CHEN HONG  , ZHANG YUN  , WANG WEN-KUI  ,   (1)中国科学院国际材料物理中心,沈阳,110015; (2)中国科学院物理研究所,北京,100080
Published: November 2020

Solid state reaction interdiffusion of Fe-Ti multilayer modulated films was investigated by means of dynamic in situ X-ray diffraction. With this method, the measurement of the X-ray modulation peak intensity was relatively accurate and the shift in X-ray modulation peak position was also observed. The interdiffusion coefficients of Fe-Ti modulated films were calculated at different temperatures. Plots of the interdiffusion coefficients versus time at different temperatures were given. According to the variation rate of D vs. τ, the activation enrrgy Qy relative to viscosity relaxation was calculated to be 8.3±0.2 kcal/mol.
MAGNETIC TRANSITION IN La2CuO4 INDUCED BY MAGNETIC FIELD PARALLEL TO CuO2 PLANE
Authors: YU ZHI-MING  , WU HANG-SHENG  ,   中国科学技术大学物理系,合肥230026
Published: November 2020

In this letter, we develop a theory in the mean-field approximation for the spin-flop transition in La2CuO4 when the magnetic field is parallel to the CuO2 plane. The temperature dependence of the critical field predicted by our theory agree qualitatively with the experiment. However, there is no multicritical point according to our theory. The origin of this disagreement is discussed briefly.
SUPERPOSITION STATES OF EXCITONS IN SEMICONDUCTOR AND RECOMBINATION RADIATION
Authors: HUANG HONG-BIN  ,   东南大学物理系,南京,210018
Published: November 2020

Under Bose and non-Bose approximations, the squeezing, antibunching and sub-Poisso-nian statistics of one-exciton and two-exciton in the Dicke and Fock superposition states are discussed. The recombination radiation of excitons in these superposition states can also have these non-classical effects. The results obtained in various situations are compared and explained.
PLASMON THEORY OF THREE-DIMENSIONAL TIGHT-BINDING ELECTRON GAS
Authors: WANG XIAO  , CAI JIAN-HUA  ,   (1)南京大学物理系,南京,210008;南京炮兵学院物理教研室,南京,211132; (2)上海交通大学应用物理系,上海,200030
Published: November 2020

The collective excitations of three dimensional tight-binding electron gas system have been studied in the case of three different kinds of structures (s.c.,f .c.c.,b.c.c.). By random phase approximation, we obtain the matrix formulation of the theory.
VALENCE BAND OFFSET IN PSEUDOMORPHIC Si/Ge0.25Si0.75/Si SINGLE QUANTUM WELL MEASURED BY DEEP LEVEL TRANSIENT SPECTROSCOPY
Authors: LI XIAN-HUANG  , LU FANG  , SUN HENG-HUI  ,   复旦大学物理系,上海200433
Published: November 2020

The band offset between strained GexSi1-x and unstrained Si is mainly due to the valence band offset ΔEv. The thermal emission energy from a quantum well is related to the appropriate band offset. The single quantum well (p type Si/Ge0.25Si0.75/Si) samples were grown by molecular beam epitaxy (MBE), the width of quantum well is 15nm. Deep leve transient spectroscopy (DLTS) measurement have been used to study the valence band offset. After considering the band bending due to the electric field and the first subband energy, the valence band offset ΔEv of the single quantum well was estimated as about 0.19eV, it is in reasonable agreement with theoretical results. The same and difference of emission and capture processess between quantum well and deep level defects were discussed.
A STUDY ON MAGNETIC THERMALLY FLUX CREEP OF YBa2Cu3O7-δ THIN FILM
Authors: ZHANG YI-TONG  , JIN XIN  , ZHANG CHANG-GUI  , JIN JI-RONG  , YAO XI-XIAM  , JI ZHENG-MING  , SUN ZHI-JIAN  , YANG SEN-ZU  ,   (1)南京大学物理系,南京,210008; (2)南京大学信息物理系,南京,210008
Published: November 2020

Two high Tc superconductor YBa2Cu3O7-δ thin films, the zero resistance temperature of which were 82K and 71K respectively, were selected for measurement about resistance broadening. The difference in thermal activation energy of the two samples was analyzed with Arrhenius law auggested by Palstra We found that the activation energy decreased depending upon increasing magnetic field. The irreversibi-lity line was B*-(1-T*/Tc)3/2 deduced from our data.
RESEARCH ON THE ORIGIN OF MAGNETO-CRYSTALLINE ANISOTROPY IN COMPOUND Nd2Fe14B
Authors: LI HUA  , JIANG SHOU-TING  , MEI LIANG-MO  , GAO RU-WEI  ,   山东大学物理系,济南,250100
Published: November 2020

Based on the fact of the existance of a small amount itinerant electrons, a new theoretical model giving rise to magneto-crystalline anisotropy in compound Nd2Fe14B is presented in this paper. It is proposed that a combined effect on Nd-ion coming from both the crystal field of ligands and the electric field of itinerant electrons results in the anisotropy in the compound. An approach of calculating the interaction between itinerant electrons and central Nd-ion is given. The magneto-crystalline anisotropy of Nd-ion and its temperature dependences are calculated based on the model. The results are in good agreement with the experiments, and also give explanation to the spin reorientation phenomenon in the compound.
MASTER EQUATION OF A SPIN IN PERIODIC FIELD AND THE STEADY STATE
Authors: ZHANG YU-MEI  ,   同济大学物理系,上海200092
Published: November 2020

Robertson's theory is applied to derive the master equations of a spin under the action of a static longitudinal field and a rotating transverse field. The damping and the steady state of the spin are obtained as functions of field strength, frequency and the coupling with the bath The structure of the steady state and its origin are discussed.
AN INVESTIGATION ON SURFACE STATUS, STRUCTURE RELAXATION AND CRYSTALLIZATION PROCESS OF Fe35Ni15B26 NANOMETER METGLAS
Authors: HU ZHENG  , FAN YI-NING  , CHEN YI  , XIA YUAN-FU  ,   (1)南京大学化学系,南京210008; (2)南京大学物理系,南京210008
Published: November 2020

The surface status, structure relaxation and crystallization process of Fe35Ni15B26 nanometer metglas produced by chemical reduction method were investigated by using X-ray photoelectron spectroscopy and M?ssbauer spectroscopy. The experimental results indicated that it is rich in nickel and lack in iron on the oxidized particle surface compared with the bulk composition of the particles. The change of hyperfinc field distributions during structure relaxation is correlated with the variance of short range order. The crystallization product is different from that of traditional amorphous ribbon with the similar composition because of the heterogeneous distribution of elements in particles.
CHAOS IN A TWO-PHOTON QUANTUM OPTICAL MODEL
Authors: ZHANG JI-YUE  , XU MING  ,   西北大学物理系,西安710069
Published: November 2020

In this paper, we study the chaotic behavior of a two-photon quantum optical model. The results show that the model can exhibit chaotic behavior without any perturbation or modulation terms. The chaos is characterized by Fourier analysis and the maximal Lyapunov exponent. The properties of the chaotic behavior are also discussed. We proved that the two-photon J-C model, which contains the rotating-wave approximation, cannot exhibit chaotic behavior.
THEORETICAL TREATMENT OF RESONANCE RADIATION IMPRISONMENT SOLUTION TO HOLSTEIN'S EQUATION
Authors: LAI RE  , LIU SHI-LIN  , MA XING-XIAO  ,   中国科学技术大学近代化学系,合肥230026
Published: November 2020

The key to the treatment of the resonance radiation imprisonment lies in the solution to Holstein's equation. A new method to solve Holstein's equation is proposed in this paper, which integrates the equation directly by means of operator calculation and results in a formula for the excited particles in an infinite series in an integral operator. Our study on the behavior of the high-ordercoefficients of this series leads to the success in overcoming the difficulty to obtain the sum of infinite terms, and a formula of finite terms under any given precision is acquired, which applies to the whole time scale.
MONTE CARLO STUDY ON THE PHASE DIAGRAM OF THE FERROMAGNETIC BOND-DILUTE BLUME-CAPEL MODEL
Authors: ZHANG GUO-MIN  , YANG CHUAN-ZHANG  ,   苏州大学物理系,苏州215006
Published: November 2020

We have used the Monte Carlo method to study the phase diagram of the ferromagnetic bond-dilute Blume-Capel model, combined with the finite-size scalar theory, and obtained the transition temperatures in zero crystal field, Comparison is made between the results of this simulation and other methods. The influence of the bond-dilute concentration on the tricriti-cal points is determined using the Monte Carlo method.
DEEP LEVELS IN Si-IMPLANTED SEMI-INSULATOR GALLIUM ARSENIDE
Authors: QIU SU-JUAN  , CHEN KAI-MAO  , WU LAN-QING  ,   (1)北京大学物理系,北京100871; (2)机械电子工业部第十三研究所,石家庄050051
Published: November 2020

The deep centers in Si-implanted LEC semi-insulator gallium arsenide have been carefully studied using the deep level transient spectroscopy (DLTS) technique. The results are as follows. The four majority carrier traps,E01 ,E02,E03 and E04 have been observed in the active regions of the Si-implanted LEC semi-insulator gallium arsenide after high temperature an-nealling, and their electron apparent activation energies are 0.298, 0.341, 0. 555 and 0. 821 eV respectively. The E04 trap is related to the EL2. The activation energy of the electron capture cross section of E04 is 0. 119 eV Three minority carrier (hole) traps have been newly found in the same active regions. The hole apparent activation energy of the H03 trap is 0. 713 eV and its concentration is about 2. 8×1016cm-3.
BAND STRUCTURE OF Si/Ge STRAINED LAYER SUPERLATTICE
Authors: QIAO HAO  , ZI JIAN  , XU ZHI-ZHONG  , ZHANG KAI-MING  ,   复旦大学物理系,上海200433
Published: November 2020

The electronic structures of short period (Si)n/(Ge)m Strainedlayer superlattices (SLS's) are calculated using empirical tight-binding method. The results indicate that due to the zone-folding, only the SLS's with n+m=10 have the posibility to form direct band gap. For SLS's with n+m=10, the type of energy gap is determined by the relative energies of conduction band valleys at Γ, N, and Δ. However, the Ge layers number and the composition of substrate play an important role. For (Si)6/(Ge)4 and (Si)8/(Ge)2 SLS's grown on Si1-xGex substrate, direct or quasidirect band gap could be got for the substrate composition 0.4≤x≤1.0 For (Si)4/(Ge)6, direct gap could be obtained only for 0.3≤x≤0.6, and in (Si)2/(Ge)8 SLS's the gap could not be direct for all substrate composition.
INTERFACE STATES AND DEEP CENTERS IN Au-DOPED MOS STRUCTURES
Authors: CHEN KAI-MAO  , JIN SI-XUAN  , WU LAN-QING  , ZENG SHU-RONG  , LIU HONG-FEI  ,   (1)北京大学微电子学研究所,北京100871; (2)北京大学物理系,北京100871; (3)北京有色金属研究总院,北京100088
Published: November 2020

Behavior of gold in the Si/SiO2 interface region has been investigated using deep level transient spectroscopy (DLTS) in the MOS structures made on p-type silicon wafers with orientation. The results are as follows. A new defect, Au-Hit(0.445), has been observed at the interface, which is the incorporation of gold atom by the interaction with the interface defect, Hit(0.494). A continuous spectrum of the interface states related to gold has also been measured in the lower half of Si band gap, which are acceptors, and the physical mechanism of the positive shift of the flat band voltage of the MOS structure caused by gold doping ean be explained in terms of these gap states. The profile of the gold donors in the silicon near the interface has been obtained, which is not monotonically increase towards the surface but exhibits a maximum at 0.37μm from the surface.
DIELECTRIC RELAXATION OF NONCRYSTALLINE REGIONS IN THE FERROELECTRIC COPOLYMERS OF VINYLIDENE FLUORIDE/TRIFLUOROETHYLENE
Authors: ZHANG XING-YUAN  , TAKEO FURUKAWA  ,   (1)中国科学技术大学材料科学与工程系,合肥230026; (2)中国科学技术大学理化学研究所,日本351-01
Published: November 2020

The films of copolymers of vinylidene fluoride with trifluoroethylene (VDF/TrFE) with different crystallinity were prepared by four methods, i. e. , as-cast, quenching in liquid nitro-gen, slow-cooling and annealing at 140℃. The complex dielectric constants were measured using an improved dielectric relaxation spectrometer whose precision increased to 2‰ from the original 1%. The dielectric relaxation of noncrystalline regions was found in accordance with the dielectric frequency spectra of quenched sample that the crystallinity was 20% below room temperature. Thereby, the relationship between the glass transition temperature and the component of copolymers was got.
GENERAL FORMS OF FIELD EQUATIONS AND FREE PARTICLE'S EQUATIONS OF MOTION FOR THEORIES OF GRAVITATION
Authors: CHEN FANG-PEI  ,   大连理工大学物理系,大连116024
Published: November 2020

The general forms of field equations and free particle's equations of motion for theories of gravitation are derived from the generalized Lagrangian densities of matter fields and free gravitational fields with the aid of invariant property in the (εmn,ξμ) transformations. The General Relativity, the ECSK theory and the general type R+R2+T2 theory of gravity with torsion are shown all to be the special case of the theory given in this paper.
CHARGE TRANSFER BETWEEN ALKALI ATOMS AND W,Pt SURFACES
Authors: JIN CHUN-LIN  , LI ZHONG  , ZANG DE-HONG  , YE HUI  , TANG JIA-YONG  , YANG FU-JIA  ,   复旦大学物理二系三束材料改性国家重点实验室,上海200433
Published: November 2020

The interaction of thermal alkali atoms on hot tungsten and platinum filaments has been studied experimentally. The positive ion current has been measured as a function of the surface temperature. Electron exchange between the adatom and metal surface and the change of work function of the adsorbed metal surface have been discussed.
PHOTOCONDUCTIVITY FOR POLYDIACETYLENE SINGLE CRYSTAL
Authors: PENG JING-CUI  ,   湖南大学应用物理系,长沙410082;中国高等科学技术中心(世界实验室),北京100080
Published: November 2020

The photoconductivity along the polymer hain direction for poly [bis(p-toluene sulpho-nate) ester of 2,4-hexadiyne-l,6-diol] (PDA-TS) single crystal is investigated. After analyzing the limitation of Onsager's model for bimolecular geminate pair thermalizing, a new model of photogenerated charge carries is presented and it is used to explain the dependence of stationary photocurrent Iph on the energies of incident photon.
THEORETICAL ANALYSIS OF CURRENT DISTRIBUTIONS OF GLOW DISCHARGE PLASMA IN 3-DIMENSIONAL SPACE
Authors: S. T. BAI  , ZHOU TING-DONG  ,   清华大学电机系气体放电与等离子体实验室,北京100084
Published: November 2020

Current distributions of glow discharge plasma in 3-D space were theoretically analyzed with analytic method. The characterestics of the current continuity and self consistency of the theory were demonstrated. Deficiencies and inconsistencies in the result obtained from other models were also discussed and analyzed. The present results are believed to be useful and significant in the study of low temperature plasma.
X-RAY TRIPLE AXIS SCATTERING STUDIES OF YBa2Cu3Oy SUPERCONDUCTING THIN FILM
Authors: LI CHAO-RONG  , MAI ZHEN-HONG  , P. D. HATTON  , C. H. DU  ,   (1)Department of Physics,University of Edinburgh ,U. K.; (2)中国科学院物理研究所,北京100080
Published: November 2020

The YBa2Cu3Oy thin film on LaAlO3 substrate was investigated by triple axis scattering. Stress, main defects in the film and the crystallographic relationship between the thin film and substrate were studied. Experimental results show that the thin film on substrate was slmost totally relaxed and very low strain and stress existed in the film. The film behaves as a "free" bulk layer on the subtrate. The larger mosaic width of the film indicates the film has poor crystallinity and includes a lot of lattice misorientation defects. Misorientations between the film and substrate were observed in both the perpendicular and parallel direction of the surface.
PHOTOLUMINESCENCE OF (110) MODULATION-DOPED GaAs-AlGaAs HETEROSTRUCTURES
Authors: CHENG WEN-QIN  , LIU SHUANG  , ZHOU JUN-MING  , LIU YU-LONG  , ZHU KE  ,   中国科学院物理研究所,北京100080
Published: November 2020

The photoluminescence spectra of (110) modulation-doped GaAs-AlGaAs het-erostructures grown under high and low carbon background were measured at 4.2K. For high carbon specimen the luminescence peak from the recombination of 2D electrons in channel with holes bound to neutral acceptors was observed, while for low carbon specimen only lines related to bulk GaAs were observed.
VIBRATIONAL SPECRTA OF SINGLE CRYSTAL Li2B4O7
Authors: ZENG LING-ZHI  , JIANG YI-JIAN  , FU YI  , ZHOU YA-DONG  ,   北京工业大学应用物理系,北京100022
Published: November 2020

Polarized Raman spectra of single crystal Li2B4O7 have been measured in the wavenum-ber shift range of 50-3000cm-1 at room temperature. The infrared absorption spectrum of Li2B4O7 has also been measured in the range of 200-4000cm-1 for powder samples dispersed in the pressed KBr disks. Based upon the experimental results of LO-TO splitting, the effective charge and mode strength of polar modes are calculated. A comparison of the structure and B-O stretching vibration frequency of various borate species suggests comparatively high nonlinear optical efficiency of Li2B4O7 crystals.
DOUBLE WAVE DESCRIPTION OF THE MOTION OF A CHARGED PARTICLE IN A UNIFORM MAGNETIC FIELD
Authors: HUANG XIANG-YOU  , LIU QUAN-HUI  , TIAN XU  , QIU ZHONG-PING  ,   北京大学物理系,北京100871
Published: November 2020

Double wave quantum theory is applied to describe the motion of charged particle in a uniform magnetic field. This description of the motion of the particle is complete. One can tell the value of an arbitrary physical quantity at any time. The probability and the formula to calculate mean values in ordinary quantum mechanics comes from the average of double wave description over a certain ensemble. The rule of gauge transformation in quantum mechanics can be seen from the average over an ensemble.
A NONSTATIC PLANE-SYMMETRIC SOLUTION OF EINSTEIN EQUATIONS WITH A SPECIAL SCALAR FIELD
Authors: LI JIAN-ZENG  ,   北京广播学院,北京100024
Published: November 2020

A nonstatic solution of plane-symmetric metric generated by a special scalar field V = V(t-z) has been obtained. The global properties, such as its symmetries, singularities, are also investigated.
A COMMENT ON "GENERAL CONSERVATION LAWS IN EINSTEIN-CARTAN THEORY"
Authors: LI CHENG-YAO  ,   西安电子科技大学物理系,西安710071
Published: November 2020

In this paper, it is proved that if both general displacement of coordinates and the Lie derivative of vierbeins are treated as symmetric transformation, then it is impossible to obtain the called general covariant energy-momentum conservation laws in Einstein-Cartan theory byNoether theorem.
DEPENDENCE OF FIELD-IONIZATION THRESHOLD ON |ml| FOR RYDBERG STATES OF Sr ATOM
Authors: LI JING  , XU YUN-FEI  , WANG YUN-XIAN  , ZHANG SEN  ,   浙江大学物理系,杭州310027
Published: November 2020

We have obtained Rydberg atom of different |ml| value by two-step excitation using polarized lasers. The field-ionization thresholds for 5snd (n= 22-27), | ml| =0,1,2 Rydberg states of Sr atom is measured by using a pulse electric field (up to 2.4kV/cm). Second-order approximate formula of field-ionization threshold that depend on the |ml| value is obtained and compared with the measured data.
AB-IN1T1O MOLECULAR DYNAMICS STUDIES ON GALLIUM CLUSTERS
Authors: GONG XIN-GAO  , ZHENG QING-QI  ,   中国科学院固体物理研究所,合肥230031
Published: November 2020

The ab-initio molecular dynamics method and simulated annealing technique have been used to study the structural properties of small gallium clusters. We have found a transition from planar to nonplanar structure at n=5. Ga, molecule and zig-zag chain are building blocks of gallium clusters.
LASER GINZBURG-LANDAU EQUATION AND ITS PHASE DIFFUSION EQUATION
Authors: WANG KAI-GE  ,   北京师范大学物理系,北京100875
Published: November 2020

The dynamical behavior of laser Ginzburg-Landau equation, which describes the sponta-neously spacial temporal symmetry breaking, has been investigated, In the case of inhomoge-neous stationary solution, it shows the cooperative frequency locking; and in the case of spa-tial-temporal oscillatory solution, all the transverse modes have a common optical carrier fre-quency. However, a chaotic solution can be generated at lower pumping, due to the diffraction of electro-magnetic field and nonlinearity. The numerical results show that, in the situation of small detuning, the reduced phase diffusion equation of this model can more precisely du-plicate its global dynamical behavior. It illustrates that the phase pattern of field guides the dy-namics in spontaneous formation of the transverse pattern of field.
A DYNAMICAL CONVERGENCE CRITERION FOR THE REAL-SPACE MULTI-SLICE IMAGE SIMULATION METHOD
Authors: ZHU SHI-XUE  , WANG YUAN-MING  , WANG SHAO-QING  , YAN DE-QIN  , JIN ZHI-XIONG  ,   中国科学院金属研究所固体原子象开放研究实验室,沈阳110015
Published: November 2020

This paper gives a new dynamical convergence criterion (RSMSD) in the real space multi-slice (RSMS) method, which imposes a practical restriction in choosing dynamically the expan-sion order for the propagator between each pair of slices by using a structure-dependent trun-cation condition, so as to avoid the intrinsic computational divergence problem of the original RSMS method. The validity of the RSMSD method for dynamical diffraction calculation in HREM has been rigorously examined. It has been found that, when the dynamical criterion is satisfied, the RSMSD method gives results in good agreement with those obtained by using fast Fourier transform multi-slice (FFTMS) method but avoiding the computing divergence which can arise in the RSMS method.
STRUCTURES AND MICRODYNAMIC BEHAVIOR OF LIQUID TRANSITION METAL Pd AND Pt
Authors: CHEN KUI-YING  , LI QING-CHUN  , CHEN XI-CHEN  ,   (1)哈尔滨工业大学,哈尔滨150006; (2)中国科学院物理研究所,北京100080
Published: November 2020

On the basis of the embedded atom model reflecting many body interactions among atoms and the effective pair potential, structures and microdynamic behavior of liquid transition me-tal Pd and Pt have been investigated by means of molecular dynamics simulation with compu-ter. Pair distribution function, mean square displacement, self-diffusion coefficients and nor-malization velocity self-correlation function have been calculated, and the influence of many body interactions on these physical quantities have been discussed. Results show that the inf-luence of many body interactions on the pair distribution function is small, but this influence on mean square displacement, self-diffusive coeffcients and normalization wlocity self-correla-tion function is cons derable.
DETERMINATION OF OXYGEN CONTENT IN HIGH Tc SUPERCONDUCTORS BY DEUTERON PARTICLE ACTIVATION ANALYSIS
Authors: TAO ZHEN-LAN  , D.E. AlBURGER  , K.W. JONES  , Y.D. YAO  , Y.H. KAO  ,   (1)Brookhaven National Laboratory,Upton. New York. 11973; (2)State University of New York.,Stony Brook. New York 11794-3800; (3)中国科学院上海原子核研究所,上海201800
Published: November 2020

The experimental method for determining the oxygen content in high Tc superconduc tors is described in detail. This method is applied to determination of oxygen content in high Tc Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O samples in which the stoichiometry is varied by reducing the copper and bismuth concentrations. The oxygen concentration is found to vary linearly with Cu (x= 0-0,2) and Bi (x= 0-0.4) deficiencies in YBa2Cu3(1-x)Oy and Bi2(1-x)Sr2CaCu2Oy respectively. X-ray powder diffraction measurements show that the compound of YBa2Cu3(1-x)Oy, is orthorhombic in the variation range of x=0-0.2
HIDDEN LOCAL GAUGE INVARIANCE IN FATEEV-ZAMOLO-DCHIKOV QUANTUM SPIN CHAIN
Authors: GUAN XI-WEN  , XIONG ZHUANG  , ZHOU HUAN-QIANG  ,   四川师范大学物理系,成都610066
Published: November 2020

Hidden local gauge invariance in Fateev-Zamolodchikov quantum spin chain is studied in detail in the framework of the quantum inverse scattering method (QISM). It is found that, similar to the case of spin 1/2, this model admits an Abelian U(1) gauge transformation and that the energy spectrum is gauge invariant whereas the eigenvectors are explicitly gauge dependent.
STUDIES ON ELECTRIC CONDUCTIVITY AND ELECTRON SPIN RESONANCE FOR IODINE DOPED POLYACETYLENE
Authors: GUI YUN-LONG  , LIN SEN-HAO  , ZHANG JIA-HUA  ,   中国科学院上海原子核研究所,上海201800
Published: November 2020

The four-probe technique is used to measire the electric conductivity of polyacetylene doped with iodine. For dopant concentration ranging from 1.0 to 8.3 mol% in cis-(CH)x, the obtained conductivity values for different temperatures are consistent with the variable-range hopping model. The mechanisms of the temperature dependence of the ESR spin magnetic susceptibility and line width for low iodine concentrations are studied.
AMPLITUDES OF ELECTRONIC WAVEFUNCTIONS AT NUCLEI FOR ATOMS (III)——THEIR DEPENDENCE ON THE CHOICE OF SCF METHODS
Authors: LIU LEI  ,   中国科学院物理研究所,北京100080;复旦大学物理系,上海200433;三束材料改性国家重点联合实验室,复旦大学分部,上海200433
Published: November 2020

Based on Dirac-Fock, Dirac-Slater, Hartree-Fock and Hartree-Slater self-consistent-field methods, we have conducted calculations of reduced normalization factors of occupied shell wavefunctions of nitrogon, iron, and uranium atoms as well as nitrogon-like inon and uranium ions. Their dependence on various coupling terms as well as relativistic effects and effects of the Slater local electron density approximation are discussed.
ELECTRON IMPACT IONIZATION CROSS SECTIONS OF BORON-LIKE IONS
Authors: FANG DU-FEI  , WANG YAN-SEN  , HU WEI  , GAO HAI-BIN  , LU FU-QUAN  ,   复旦大学物理二系,上海200433
Published: November 2020

By using a distorted-wave Born exchange approximation, the direct ionizarion cross section of boron-like ions by electron impact have been calculated. The interferences between direct and exchange amplitudes make important contribution in the process of ionization. The calculated results indicate that the "Natural Phase" approximation is better than the "Maximum Interference" approximation, while the latter agrees better with experiments for some other species of ions. Compared with Coulomb-Born approximation of Moores et al., our calculation gives better agreement with the experiment data available.
GAIN SATURATION EFFECTS IN NONEQUILIBRIUM GAS FLOW AND CHEMICAL LASERS
Authors: FAN AN-FU  , GAO ZHI  ,   (1)四川大学光电科学与技术系,成都610064; (2)中国科学院力学研究所,北京100080
Published: November 2020

In this paper a "convection-nonequilibrium cross relaxation" theory is presented for a gas flow and chemical lasers: The experessions of gain coefficienr and saturated gain spec-trum are derived for the two-type flow models of a gas flow medium with turbulent or lami-nar flow mixture respectively. Some new gain saruration laws are obtained. The unsaturated and saturated gain are dependent on the streamwise distance. The numerical results show that the gain profiles of a saturated amplifier with Doppler-broadening presents some "anoma-lous" phenomena with a mixture of inhomogeneous and homogeneous profiles. The present theoretical results agree with the measured results
DEVELOPMENT OF THREE-WAVE INTERACTIONS IN A PLASMA BEAT-WAVE ACCELERATOR
Authors: YU WEI  , XU ZHI-ZHAN  , MA JIN-XIU  , CHEN RONG-QING  ,   中国科学院上海光学精密机械研究所,上海201800
Published: November 2020

The interactions of two-frequency laser with Langmuir wave in a plasma beat-wave acce-lerator are calculated. We show that the development of the Langmuir wave from initial stage to saturation is closely correlated to the evolution of the three waves involved from phase locking to phase mismatching. The phase difference, describing the extent of three-wave coup-ling, is therefore of great importance in Langmuir-wave excitation by beating two-frequency la-ser.
ERROR ANALYSIS FOR VOIGT FUNCTION METHOD
Authors: CHANG MING  , XU SHOU-LIAN  ,   天津大学机电分校,天津300380
Published: November 2020

Error analysis is carried out systematically for Voigt function method. The rules of error are obtained, and described in the form of formula and diagrams. The reliability regime of this method is also given.
STRUCTURE OF THE SPECTRA AND BONDING STRUCTURE OF LASER-PREPARED NANOMETER a-SixNy:H MATERIAL
Authors: LI DAO-HUO  , WEI XIONG  ,   中国科学院安徽光学精密机械研究所,合肥230031
Published: November 2020

The bonding structure of laser-prepared nanometer a-SixNy:H powder and the bulk body prepared by pressing of powder are studied by IR and Raman spectroscopy. It is found that there are Si-N Si-Si, Si-H, N-H, Si-O-Si bonds and OH group in a-SixNy:H. The distortion of the spectra and the change of bonding structure of the bulk body before and after annealing are discussed.
TEM STUDY OF MICROSTRUCTURAL CHANGES INDUCED BY AR ION IMPLANTATION IN YBa2Cu3O7-x SUPERCONDUCTING FILMS
Authors: LI YI-JIE  , XIONG GUANG-CHENG  , GAN ZI-ZHAO  , REN CONG-XIN  , ZOU SHI-CHANG  ,   (1)北京大学物理系,北京100871; (2)中国科学院上海冶金研究所离子束开放研究实验室,上海200050
Published: November 2020

Ar ion implantation induced superconductivity change and structural change in YBa2Cu3O7-x epitaxial films have been studied. After implantation, not only Jc and Tc of the sa-mples decreased with the increasing of Ar ion fluence, but also a metal-to-semiconducfor transition occurred. The TEM photographs showed that the lattice frame of the implanted sa-mples was nearly unchanged under low fluence. Only at high fluence, the structure was comple-tely destroyed. According to the experimental results, we suggest that the degradation of Jc and Tc may mainly result from the disordering of oxygen sublattice.
ALGEBRAIC PROPERTIES OF THE SEMI-PLANE-SYMMETRIC STATIC SPACE-TIME YIELDED BY SEMI-PLANE-SYMMETRIC NON-NULL ELECTROMAGNETIC FIELDS
Authors: QIANG WEN-CHAO  ,   西安冶金建筑学院基础课部,西安710055
Published: November 2020

The spin coefficients and the tetrad components of the Weyl tensor of the semi-plane-sym-metric static space-time yielded by semi-plane-symmetric non-null electromagnetic fields are found, It is shown that this space-time is of Petrov type I. The behavious of null-vectors and optic scaiars are also discussed.
ELECTRONIC STRUCTURE AND SHAPE RESONANCE OF DIATOMIC MOLECULE C2 AND C2+ AND C2-
Authors: LIU LEI  ,   复旦大学物理系,上海200433;三束材料改性国家重点联合实验室,复旦大学分部,上海200433;中国科学院物理研究所,北京100080
Published: November 2020

We present a theoretical study of electronic structures and shape resonances of diatomic molecule C2 and C2+ and C2- Shape resonances are essentially quasi-bound states which are intimately connected with antibonding molecular orbitals. It is found that as the number of electrons decreases, the energy positions of the shape resonances shift downward, and as the corresponding antibonding molecular orbitals lie below the ionization threshold, the shape resonances disappear.
A CALCULATION METHOD TO OBTAIN NONLINEAR INTER-NAL FRICTION MATERIAL PARAMETERS FOR THE MEASUREMENT WITH TORSIONAL PENDULUM
Authors: SUN ZONG-QI  , YAN DE-QIN  ,   中国科学院金属研究所,沈阳110015
Published: November 2020

Assuming the smallness of the internal friction which depends only on the amplitude of shear strain, based on analytical mechanics, we developed a calculation method to obtain non-linear material parameters of internal fiction and shear modulus from the sampled data of tor-sional displacements of the free-decay oscillation for the torsional pendulum.
NUMERICAL SIMULATION OF UNSTEADY THERMAL CONVE-CTIVE PROCESS IN CZOCHRALSK1 CRYSTAL GROWTH
Authors: TAO FENG  , MA WEN-JU  , ZHENG YUN  , XUE MING-LUN  ,   中国科学院力学研究所,北京100080
Published: November 2020

A numerical study for representing time-dependent natural convection of Czochralski melts, while the growing crystal and crucible do not rotate, is presented in this paper. Using a finite control volume algorithm with central-diference discretization of advective and diffusive fluxes, the Czochralski flow which is governed by the rwo-dimensional N-S equations based on Bous-sinesq approximation is computed. The calculations present some interesting streamlines and isotherms with typical time, total kinetic and thermal energy as function of time. The time-de-pendent transport phenomena in Czochralski melt extend into oscillatory for Gr = 1.6×106 in Pr=0.015. This results obviously influence the thermal fluxes at the crystal-liquid interface. The unsteady simulation in this paper is much helpful for the recognition of natural convection and actural crystal growth in Czochralski melts. The program are also available to other models of Czochralski crvstal growth.
EFFECT OF Pd2Si FORMATION ON X-RAY DIFFRACTION OF Pd/Si MULTILAYERS
Authors: YIN SHI-LONG  , WANG BING  , GAO CHEN  , WU ZI-QIN  , WANG XIAO-PING  , ZHAO TE-XIU  ,   (1)河海大学数理系,南京210024; (2)中国科学技术大学基础物理中心,合肥230026; (3)中国科学技术大学物理系,合肥230026
Published: November 2020

The effect of Pd2Si formation on the X-ray diffraction of Pd/Si periodic multilayer films after annealing has been studied by X-ray diffraction in small and high angle regimes. The results show that the influence of Pd2Si in small period multilayers is more severe than that in large period multilayers. The periods of multilayers have been calculated with one peak posi-tion or with two peak positions after introducing the refractive correction, and the latter is more accurate than the former. The results of simulation show that an uniform Pd2Si layer formation in a period is not enough to explain the large variation of intensity after annealing. Roughness of the interface is another important factor to influencing the diffraction intensity.
ELECTRONIC STRUCTURES OF SOLID GALLIUM
Authors: GONG XIN-GAO  ,   中国科学院固体物理研究所,合肥230031
Published: November 2020

The electronic structures of solid gallium have been calculated by ab-initio moleculardyna-mics, the results are good in agreement with experiments. The results show that β-Ga, Ga-Ⅱ, fcc-Ga are metallic-like, but in α-Ga there is a covalent bond existing between the nearest neighbours. The phase stability of solid gallium has been also discussed.
STUDY OF OPTICAL-PHONON DEFORMATION POTENTIALS ON Λ-AXIS FOR III-V COMPOUND SEMICONDUCTORS
Authors: WANG REN-ZHI  , ZHENG YONG-MEI  , WU SUN-TAO  , HUANG MEI-CHUN  ,   厦门大学物理系,厦门361005
Published: November 2020

The study of optical-phonon deformation potentials (ODP*s) versus wavevector on 1111A-axis in Brillioun zone for nine III-V compound semiconductors is carried out systematically, based on ab initio LMTO-ASA band calculation within the frozen-phonon approximation model. The ODP*s d30(∧),d10(∧,val) and d10(∧,con) obtained from the calculation are presented.
MULTIPLE-SCATTERING THEORETICAL STUDY ON NEAR-EDGE X-RAY ABSORPTION SPECTRA OF C2H4/Ni(100)
Authors: FENG XIAO-SONG  , TANG JING-CHANG  ,   浙江大学物理系,杭州310027
Published: November 2020

In this paper the carbon K-edge near edge X-ray absorption fine strucure spectra (NE-XAFS) of adsorption system C2H4/Ni(100) are calculated by multiple-scattering cluster method. By a conparison between the theortical results and experimental spectra, the chemisorption geo-metries of this system are determined. The results show that the molecule is adsorbed on the perpendicular bridge site, and the distance between the C atom and the nearest Ni atom is 1.70? while the molecular plane tilting to the surface with 50°.It is found that the interaction between H atom and Ni substrate plays an important role in the formation of the adsorption structure. These results are verified by other ways.
STUDIES ON HIGH TEMPERATURE TRAP OF AlGaAs/GaAs GRIN SCH SQW LASER FABRICATED BY MBE
Authors: LU LI-WU  , ZHOU JIE  , XU JUN-YING  , ZHONG ZHAN-TIAN  ,   (1)半导体超晶格国家重点实验室,北京100083; (2)表面物理国家重点实验室,北京100080;中国科学院半导体研究所,北京100083; (3)集成光电子学联合实验室半导体所实验区,北京100083;中国科学院半导体研究所,北京100083; (4)中国科学院半导体研究所,北京100083
Published: November 2020

The high temperature traps of AlGaAs/GaAs GRIN-SCH SQW lasers fabricated by MBE has been studied using DLTS technique.The majority and minority carrier DLTS spectra show that high temperature trap, having larger capture cross section and concentration, exist in n-AlGaAs layer of lasers. This trap may correlate strongly with oxygen content of AlGaAs layer grown by MBE. It may be responsible for the degradation of laser performance. High temperature hole trap may spatially localize between the interface of xAl= 0.2→0.43 and xAl= 0.43 n-AlGaAs layers. And high temperature electron trap may spatially localize in the interface regions of discontinous variation Al mole fraction of AlGaAs layer with xAl= 0.43.