bluuebunny/crossref_metadata_2025 huggingface dataset:
TRANSFER CHARACTERISTICS OF NONRADIATIVE ENERGY FROM Tb3+ TO Ce3+ IN YTTRIUM GALLIUM GARNETS
Authors: LIU XING-REN  , WANG ZHONG-KAI  , WANG XIAO-JUN  ,   中国科学院长春物理研究所
Published: November 2020

Selection-excited spectra and fluorescence lifetimes of Tb3+ and Ce3+ ions in yttrium gallium garnets are obtained at room temperature. In Y3Ga5O12:Tb, Ce, Tb3+ (donor) emission spectrum and Ce3+( acceptor) excitation spectrum overlaps considerably. The observed fluorescence lifetimes of Tb3+ 5D3 and 5D4 levels decrease with Ce3+ concentration when the sample of Y3Ga5O12: Tb, Ce are excited by UV laser pulse. The mechanisms for nonradiative energy transfer from 5D3 and 5D4 states of Tb3+ to 2D3/2 state of Ce3+ are found to be electric dipole-dipole interaction. The critical distance, rate and efficiency of energy transfer from Tb3+ to Ce3+ ion are obtained. The average critical transfer distance (R0) for 5D3 and 5D4(Tb3+)→2D3/2(Ce3+) are 16.3 ? and 11.2 ?, respectively. Although the energy transfer from the 5D4 state is dominated by dipole-dipole interaction, the dipole-quadrupole interaction must also be considered.
THE INTERACTION BETWEEN AN ADATOM AND AN IMPURITY ON THE (100) SURFACE OF THE FCC TRANSIT ION-METAL
Authors: FAN XI-QING  , SHEN SAN-GUO  , ZHANG DE-XUAN  ,   郑州大学物理系
Published: November 2020

The model of the crystal surface developed by Allan was used to derive the Green's function of the fcc (100) surface for tight binding solids. The Green's function method is employed to study the general feature of an adsorbate, and to analyse the interaction energy between an adatom and the substitutional impurity atom at metal surface. Finally, the trends in the influence of substitutional impurity atom along transition series on the heat of adsorpotion for oxygen and hydrogen on the fcc (100) surface of Ni, Pd and Pt metal is predicted qualitatively.
THE UNIVERSAL DISPERSION EQUATIONS OF MSFVW AND MSBVW IN ARBITRARY MULTILAYER MAGNETIC STRUCTURE
Authors: HU WEN-ZHONG  ,   中国西南应用磁学研究所
Published: November 2020

In this paper, we study the regularity that the dispersion equation of MSFVW; in a magnetic anisotropy multilayer structure with finite width varies periodically with the number of magnetic layers increasing. After introducing three self-defined functions, the universal dispersion equation of MSFVW in an arbitrary multilayer magnetic structure is obtained Using similar procedure, a universal dispersion equation of MSBVW in the multilayer struc-ture has also been derived.
SUBHARMONIC SHORT LASER PULSE AND SINGLE MODE BEHAVIOR OF SEMICONDUCTOR LASERS UNDER IGH SPEED LARGE SINUSOIDAL ODULATION
Authors: DENG SHENG-GUI  , GUO CHANG-ZHI  ,   (1)北京大学物理系; (2)中国科学院半导体研究所
Published: November 2020

The output characteristics of semiconductor lasers under high speed large sinusoidal modulation have been analyzed numerically by means of a system of multilongitudinal-mode rate equations. It is shown that with different modulation parameters, the output may contain a regular pulse series,exhibit spectral widening and spectral shift, and under some adequate modulation conditions, 2-or multi-subharmonic short laser pulse of less than 10 ps may appear, and may be of single mode. A qualitative interpretation is given to some of these phenomena.
MEASUREMENT FOR THE HIGH EXCITED SPECTRA OF ATOMIC SAMARIUM BY USING STEPWISE LASER EXCITATION METHOD
Authors: HU SU-FEN  , QIU JI-ZHEN  , ZHANG SEN  , WANG GANG  , LIANG YI  , CHEN XING  ,   浙江大学物理系
Published: November 2020

We report the method for selecting the high excited states from the complex photoionizing spectra. Thirty energy levels of Sm near the ionization limit have been measured.
INVERSE DIELECTRIC FUNCTION AND FAST ELECTRON ENERGY-LOSS-SPECTRUM OF SEMICONDUCTOR SUPERLATTICES
Authors: YANG RUI-QING  , LU XIAO-JIA  , CAI JIAN-HUA  ,   (1)上海交通大学凝聚态物理研究所,中国高等科学技术中心(世界实验室)理论物理中心; (2)中国科学技术大学物理系; (3)中国科学院上海冶金研究所
Published: November 2020

The inverse dielectric function of semiconductor superlattices is derived with inclusion of tunneling effects between adjacent quantum wells. The result is, then, used to evaluate the fast electron energy-loss-spotrum with the conclusion that tunneling effect tend to enhance the energy loss in superlattices.
TRANSPORT PROPERTIES OF TETRAGONAL AND ORTHOR- HOMBIC PHASE IN YBa2Cu3O7-x SYSTEM
Authors: RUAN YAO-ZHONG  , HU XUE-LONG  , LI LI-PING  , MENG GUANG-YAO  , HU JUN-BAO  , JIANG ZHI-HONG  , ZHANG YU-HENG  ,   中国科学技术大学物理系
Published: November 2020

The resistance and thermoelectric power were measured for a series of single phase YBa2 Cu3O7-x samples with different quenching temperature. The relation between the thermopower and temperature indicates that there exists a phonon-drag peak in orthorhombic phase sample. The peak disappears in tetragonal phase sample. This phenomeron suggests that the electron-phonon interaction influences the superconduc tivity of YBa2 Cu3O7-x. According to the experimental data of thermoelectric power, estimation for the Fermi energy and carrier concentration of the sample are made.
X-RAY HUANG DIFFUSE SCATTERING FROM DEFECTS IN γ IRRADIATED LiF CRYSTAL
Authors: JIANG XIAO-MING  , WU ZI-QIN  , QIAN LIN-ZHAO  ,   中国科学技术大学基础物理中心
Published: November 2020

Using X-ray diffractometer equipped with a premonochromator, X-ray Huang diffuse scattering from defects in γ irradiated LiF crysial has been measured with differential and integral methods. The results show that the strain field of irradiation defects in LiF crystal is nearly isotropic.
SUPERCONDUCTIVITY THEORY OF THE ELECTRON-MANY PHONONS COUPLINGS
Authors: FAN XI-QING  , LIU YAN-ZHANG  , WANG HUAI-SHENG  , LIU FU-SUI  ,   (1)北京大学物理系; (2)郑州大学物理系
Published: November 2020

The modified Eliashberg equations and Tc formula are obtained by incorporating the effect of many phonons into the theory of superconductivity. The result of our analysis is that the high frequency phonon plays an important role in raising Tc, and the large number of degenerate degree contributes greatly to superconductivity as well.
A GENERAL COVARIANT DERIVATION OF ELECTRON ENERGY GAIN IN A LASER ACCELERATOR
Authors: ZHU SHI-TONG  , SHEN WEN-DA  , DENG XI-MING  , WANG ZHI-JIANG  ,   (1)上海科学技术大学物理系; (2)中国科学院上海光学精密机械研究所; (3)中国科学院上海光学精密机械研究所,中国高等科学技术中心(世界实验室)理论物理分中心
Published: November 2020

In this paper, we derive an expression of energy gain in a laser electron accelerator by using a general covariant coordinate transformation. It is pointed out that even when the external gravitational field, is absent, the electrons will still be additionally accelerated by the influence of background medium. In the vacunm case, the obtained results agree with those obtained by the Lorentz transformation.
INFRARED AND FAR-INFRARED SPECTRA OF THE OXIDE SUPERCONDUCTORS TixY1-xBa2Cu3O7-δ
Authors: YE HONG-JUAN  , YU ZHI-YI  , LU WEI  , JI HUA-MEI  , CHEN JIAN-XIANG  , LI GUANG-YUAN  , CAI PEI-XIN  , GU WEI-FANG  ,   (1)华东化工学院物理系; (2)中国科学院上海技术物理研究所; (3)中国科学院上海冶金研究所
Published: November 2020

This paper reports the infrared and far-infrared spectra of TixY1-xBa2Cu3O7-δ (x = 0.2, 0.4) superconductors in the temperature range of 300K to 4.2K. Seven reflection peaks have been observed in the range of 50-360cm-1 and identified -to be associated with the vibrations of Ba, Cu, 0 ions, Y, 0 ions, Ti, 0 ions, and Cu-0 bonds respectively. For x - 0.2, two inversion structures were observed, but only one for x = 0.4. In the infrared spectra six reflection and three absorption peaks were observed, the intensities increase with the increase of the Ti content. We discussed the origin of the peaks and the inversion structures comparing with YBa2Cu3O7-δ.
THE ROLES OF Cu O PLANES AND CHAINS IN Yba2Cu3O7-y
Authors: ZHAO YONG  , ZHANG HAN  , ZHANG TAO  , ZHANG QI-RUI  ,   (1)浙江大学物理系; (2)中国科学技术大学物理系
Published: November 2020

The crystal structure, electronic transport properties in normal states, and superconductivity of a series of sample YBa2Cu3-xMxO7-y, (M = Zn,Ni, 0≤x≤0.3) have been studied, and a more direct evidence of preferential substitution of Zn for Cu(2) is obtained. In addition, an orthor-hombic(Ⅰ)-to-orthorhmbic(Ⅱ) structural transition in Zn-doped system as well as the effect of electronic localization in Ni-doped system is observed. The investigation shows that the Zn2+ may replace Cu(2) preferentially, but no such replacement for Cu by Ni was found. The role of Cu-O planes and chains on superconductivity is discussed. The importance of the coupling between Cu-O sheets and chains for high Tc superconductivity are noticed.
MONTE CARLO RENORMALIZATION GROUP STUDY OF THREE-STATE AND FOUR-STATE POTTS MODEL ON TWO-DIMENSIONAL RANDOM TRIANGLE LATTICE
Authors: HUANG WU-QUN  , CHEN TIAN-LUN  , XIN YUN-WEI  ,   南开大学物理系
Published: November 2020

An improved Monte Carlo renormalization group method is applied to three-state and four-state Potts models on two-dimensional random triangle lattice. Their fixed points and critical exponents are analysed. The critical exponents obtained are consistent with the theoretical analytical values.
INVESTIGATION OF SURFACE PHONONS AT IDEAL, RELAXED AND 2×1 RECONSTRUCTED Si(lll) SURFACE
Authors: LIN ZI-JING  , WANG KE-LIN  ,   中国科学技术大学基础物理中心
Published: November 2020

Using the perturbation method to study the influence of the coupling between occupied states and empty states on the electronic band energy, we obtained analytical expressions for semiconductor force constant calculation within the scheme of extended band orbital approximation. The surface phonon dispersion curves and related vibrational amplititude distribution of Si(111) ideal, 1×1 relaxed and 2×1 reconstructed Haneman model surfaces are calculated by means of these expressions. The results for different surfaces show the important effects of surface relaxation and reconstruction on the properties of surface phonons. It is also shown that the Haneman model for Si(111)-2×1 reconstructed surface can not explain the experimental surface phonon measurement very well.
FORMATION OF BULK METALLIC GLASS Pd40.5Ni40.5P19 BY SOLIDIFICATION WITHOUT CONTAINER IN A DROPPING TUBE
Authors: WANG WEN-KUI  , QIN ZHI-CHENG  , XU YING-FAN  , SUN GUO-XIAN  , XU XIAO-PING  , BAI HAI-YANG  , JIN ZUO-WEN  , LIU PEI-MING  , CHEN JIA-GUI  ,   中国科学院物理研究所
Published: November 2020

The dispersed molten droplets of Pd40.5Ni40.5P19 alloy solidified during fall down in a 1.2 m drop-tube which is filled with purified helium at 0.8 atmosphere. Owing to solidificat ion without container occurring at high undercooling, the heterogeneous nucleation was inhibited and the metallic glass sphere of 2 mm in diameter was obtained, which is the largest one prepared by dropping tube up to now.
COMPUTER SIMULATION OF FRACTAL BEHAVIORS IN a-Ge/Au BILAYER THIN FILMS
Authors: HOU JIAN-GUO  , BI LING-SONG  , WU ZI-QIN  ,   (1)中国科学技术大学基础物理中心,合肥,230026; (2)中国科学院福建物质结构研究所,福州,350002
Published: November 2020

Based on the experimental observation, two models were proposed to described the fractal formation in a-Ge/Au films with different interfacial structures. Computer simulations were done according to the above models, the results are in agreement with experimental observations. The results also show that the local latent temperature fields play a dominant role in the fractal formation process, and the appearance of dense branching morphology is due to the local diffusion effect.
A STUDY ON THE STRUCTURE AND THE ELECTR-ICAL PROPERTIES OF THE POLYCRYSTAL MATER IAL Li2Mo2O6
Authors: CUI WAN-QIU  , SHEN ZHI-QI  , ZHOU DE-BAO  ,   武汉工业大学,武汉,430070
Published: November 2020

The polycrystal material Li2Mo2O6 is prepared using solid phase firing method. By X-ray diffraction, IR and ESR spectra, we determined that the polycrystal material is composed of two phases: Li2Mo2O4 and MoO2. Molybdenum exists in MoO2 crystal phase in the form of Mo4+. The relationship between crystal interface and temperature is analyzed by AC complex impedance spectroscopy. The AC conductivity is measured and it is found that the ln(σT)-l/T curve consists of two straight and one curved segments. The conductivity is σ27℃=1.36×10-3(Ω·cm)-1,σ115℃=1.49×10-3(Ω·cm)-1,σ300℃=9.71×10-3(Ω·cm)-1,σ370℃=2.42×10-3(Ω·cm)-1. The activation energy is E1 = 0.043eV, E2 = 0.235eV, Eav = 0.76eV. The electronic conductivity σe is measured by Wagner method, σe27℃ = 2.24×10-5 (Ω·m)-1, σe300℃= 4.476×10-3(Ω·m)-1. It is proved that the material is a solid electrolyte at room temperature and a mixed conductor at 300℃.
EXPERIMENTAL STUDY ON ECRH TRAPPED ELECTRON BEAM INJECTED INTO THE SIMPLE MIRROR
Authors: ZHANG JUN  , WANG EN-YAO  , GUAN WEI-SHU  , CHENG SHI-QING  , DUAN SHU-YUN  , GU BIAO  , SHANG ZHEN-KUI  ,   西南物理研究院,乐山,614007
Published: November 2020

The experiments on ECRH trapped electron beam injection in various ways have been carried out on a simple mirror-MM-2 device by use of a 15GHz high power gyrotron. The experimental results show that the preionization time of plasma will be greatly reduced for the electron beam injection ahead of the microwave. And because of ECRH trapped electron beam, the parameters of hot electron ring will be improved greatly, and the diamagnetic value increases about 62 percent. The trapping efficiency of electron beam for the increasing rate of diamagnetic is about 30-40 percent. The gas "pressure window" for building a hot electron ring is (4.67-21.3)×10-4 Pa, as the gyrotron output power is about 30kW.
INVESTIGATION OF THE LARGEST CURRENT IN A RANDOM RESISTOR NETWORK
Authors: BAD KE-DA  , XIONG JIA-JIONG  ,   (1)北京大学物理系,北京,100871; (2)清华大学现代应用物理系,北京,100084
Published: November 2020

In this paper it is shown that the expected largest current in a random resistor network can be scaled as (InL)α , where L is the size of the network and the exponent a not only depends on dimension and the ratio of two conductances in the network, but also depends on the value of vertex angle β of the defects remarkably. This result follows from an analysis of the funnel configuration with a channel in it. Here we have also suggested a qualitative explanation concerning the difference in the values of exponent α when σ2→0 of Machta et al. and DEL theory.
ROLE OF Sb5+ AND Sb3+ IN THE FORMATION OF NEW HIGH TcPHASE
Authors: XIA GUO-QIANG  , WU XIAO-ZU  , LI QING-YUN  ,   西北有色金属研究院,宝鸡,721014
Published: November 2020

By comparing the R-T curves and the X-ray diffraction patterns of samples containing Sb3+ and Sb5+ , we discuss the role of Sb5+ and Sb3+ in the formation of new high Tc phase. It is found that Sb3+ partly substitutes Bi3+ forming 2223 structure; but a new high Tc phase will be produced when Sb5+ is added to the system.
RESEARCH ON THE CONDUCTION BEHAVIOR OF YBa2Cu3O7-x AT HIGH TEMPERATURE
Authors: GAO ZHI-SHUANG  , HOU ZHI-JIAN  , DU BAO-SHI  , WANG CHEN-XU  , ZHU CHANG-YU  , LI YUN-JUN  , LIU FU-SUI  ,   (1)北京大学,北京,100871; (2)郑州大学,郑州,450052
Published: November 2020

Based on the result of the YBCO's experiments at high temperatures, this paper analysed and discussed the Influences of oxygen on the YBCO's conduction behavior at high temperature and the conductive actions of one dimensional Cu-O chains. We also reported a new phenomenon of YBCO in N2, i.e., once the N2 atmosphere is replaced by the O2 atmosphere at high temperature, a rapid stractural phase transition from semconductor to metal will occur.
TUNABLE VACUUM-ULTRA VIOLET RADIATION GENERATED BY TWO-PHTON RESONANTFOUR-WAVE DIFFERENCE MIXING IN Hg VAPOR
Authors: HUANG XIAN-LING  , XIA ZONG-JU  , ZOU YING-HUA  ,   北京大学物理系,北京100871
Published: November 2020

Vacuum-ultra violet radiation is generated by 61S0-61D2 or 61S0-63D2 two photon resonant four-wave difference mixing (ω4=2ω1-ω3) in Hg vapor. VUV radiation is tunable when one of the input wave (ω3) is tuned, the tuning range is 184.9-187.5 nm. The mechanism of this frenquency conversion, for example, the two-photon and single-photon resonant enhancement and phase matching have been investigeted. The competing processes and saturation effect on conversion efficiency have been analyzed. Using the generated tunable VUV radiation, we have recorded the absorption spetrum of O2 in air.
STUDY OF DEFECTS IN CRYSTAL OF TRIHYDROXYME-THYLAMINOMETHANE BY X-RAY TOPOGRAPHY
Authors: ZHAO QING-LAN  , HUANG YI-SEN  ,   中国科学院福建物质结构研究所,福州350002
Published: November 2020

Trihydroxymethylaminomethane (TAM) is a new crystal analyzer with both chemical stability and X-ray analytical performance better than pentaerythrite(PET). The X-ray topographic experiment results show that there are not only a variety of dislocations with Burgers vectors b=±[100], ±[010], ±[001], ±[101], ±[101] and ± [011] etc, but also macroscopic inclusion arrays or isolate inclusions. The planar defect parallel to (001) plane is occured rarely. Origins of defective formation are discussed briefly.
AN EXPERIEMENTAL STUDY ON SCALING PROPERTIES OF DIFFUSIONLIMITED AGGREGATION IN UNIFORM EXTERNAL FIELDS
Authors: FENG YUE-XIN  , FENG CHANG-JING  ,   (1)江西电视大学,南昌,330003; (2)江西水利规划设计院,南昌,330029
Published: November 2020

In this article, we found that scaling properties of the cluster are changed by uniform external fields, when we adopted the model of diffusion-limited aggregation without branching to simulate the irrevesible aggregation of small particles in uniform external fields. The relationship between Hausdorff dimension D of the cluster and uniform external fields has been found: D = 2.50F0.37exp(-1.08F) + 1
THE ANOMALOUS DIFFRACTION OF A LASER BEAM IN LiNbO3:Fe CRYSTAL (Ⅰ)——e→ e DIFFRACTION
Authors: JIANG YI-JIAN  , LIAO LI-JI  , CHEN WEI-QUN  , ZHANG PENG-XIANG  , LIU YU-LONG  ,   (1)北京工业大学应用物理系,北京100022; (2)中国科学院物理研究所,北京100080
Published: November 2020

Based on the anisotropic diffraction theory of phase gratings of Stepanov et al., using the method developed by Gu and Li, we have made a detail calculation of the effect of anomalous diffraction of a laser beam passing through a cube of LiNbO3: Fe crystal. Fourier transform of the chaotic destribution of electric charge excessively accumalated in small regions shows the existence of infinite number of phase gratings. The diffraction pattern is determined by the diffraction efficiency of these gratings. The results of calculation show that the two lobes on both sides of the central spot the shapes of which are determined by the lease effect can be interpreted. Theory and experimental data fit fairly well.
SCREENING BEHAVIOR OF THE DIFFUSION-LIMITED AGGREGATION FOR SOME RANDOM WALK PARTICLES
Authors: WENG JIA-QIANG  , KONG LING-JIANG  , CHEN GUANG-ZHI  ,   广西师范大学物理系,桂林,541001
Published: November 2020

According to the computer simulation results for diffusion-limited aggregation in two-dimensional Euclidean space, we give a discussion about some formula for the screening behavior introduced by Muthukumar, Tokuyama, Hentschel and Mutsushita separately. We show that these formula give a large disaggreement with our computer simulation results for a finite system. Then, through the analysis of the process of aggregation by random walk particles, we obtain a equation for the screening behavior that agrees with the simulations in this paper. Finally, we find that the formula introduced by Muthukumar is correct if the aggregate is sufficiently large.
THEORETICAL STUDY OF MULTIPHONON RADIATIONLESS RELAXATION RATE
Authors: ZHANG BAO-ZHENG  , LI YU-XING  , LIN MEI-RONG  , CHEN WEN-JU  ,   南开大学物理系,天津,300071
Published: November 2020

In this paper, with the assuption of effective lattice mode of coupling, a generalized theoretical expression of multiphonon relaxation rate has been derived by using quantum mechanical generating function method. An analytical rate expression is presented for high-order approximation case. Limitations of relaxation rate expressions in weak coupling approxamation given by Fong et al. with the quantum statistical method, and in weak coupling approximation and low temperature approximation given by Miyakawa et al. with quantum statistical method are pointed out. The dependence of the multiphonon relaxation rate on temperature, phonon. energy, energy gap and displacement parameter are also calculated.
INFRARED DIVERGENCE RESPONSE OF STRUCTURAL RELAXATION IN KCl:OH
Authors: LIU YAN-ZHANG  , FAN XI-QING  ,   郑州大学物理系,郑州,450052
Published: November 2020

The infrared divergence response theory is applied to reorientational relaxation process of OH- in KCl: OH to study the behaviour of low temperature ultrasonic absorption in this system. Our calculation results showed that the thermally activated relaxation process makes the main contribution to the ultrasonic absorption for T>4.5K; as for T<4.5K, the tunneling relaxation process can not been neglected.
PREFERENTIAL SPUTTERING FROM Ni-Pd ALLOY AT ELEVATED TEMPERATURES
Authors: WANG ZHEN-XIA  , PAN JI-SHENG  , CHEN SHOU-MIAN  , ZHENG LI-PING  , TAO ZHEN-LAN  , WANG CHENG-BAO  , ZHANG HUI-MING  , ZHANG WEI-PING  , LU ZHAO-LUN  ,   (1)杭州大学物理系,杭州,310028; (2)上海合金厂,上海,201800; (3)中国科学院上海原子核研究所,上海,201800
Published: November 2020

Individual sputtering angular distributions and partial sputtering yields of Ni and Pd from Ni-Pd alloy have been measured at different temperatures, by using the Rutherford back-scattering spectrometry (RBS). The experimental results indicate that the partial sputtering yields of both Ni and Pd have a great change near the Curie temperature (the temperature of magnetic phase-transition of Ni-Pd alloy). Furthermore, the change of Pd partial sputtering: yield is greater than that of Ni. Ni is the preferentially sputtering element, but its preferential sputtering extent decreases during the magnetic phase-transition as taget temperature increases. The phenomena seem to be caused by the reduction of surface binding energies during the magnetic phase-transition, the surface segregation and the enhanced diffusion induced by-ion bombardment.
TEM STUDY OF CRYSTALLIZATION BEHAVIOUR OF Ni51Zr49 AMORPHOUS ALLOY
Authors: HEI ZU-KUN  , JIANG WEI-JI  ,   (1)大连海运学院,大连,116024; (2)上海交通大学,上海,200030
Published: November 2020

The crystallization behaviour of Ni51Zr49 amorphous alloy has been studied by the transmission electron microscopy (TEM). It has been found that a metastable phase, NiZr, in rose-like morphology with C-centered monoclinic lattice, a = 0.3268, b = 0.4101, c = 0.5224nm and β= 71.8° in amorphous matrix in the earlier stage of the crystallization, The following orientation relationships between the metastable phase and the stable phase, NiZr, exist: [100]NiZr＇//[100]NiZr [001]NiZr＇//[ll0]NiZr. NiZr＇ phase is regarded as a metastable state of NiZr phase and transforms to NiZr phase gradually with an increase in temperature. A small quantity of Ni10Zr7 phase formed in the final stage of the crystallization. Both NiZr and NiZr＇ have complex twins with two principle typies, one of which is 180°twins with the [02l] direction of NiZr or NiZr＇ as axis and another 36°rotation twins with [001] of NiZr or [010] of NiZr＇ as axis. The total amount of twins decrease gradually with the increase in temperature.
A COUNTER-EXAMPLE TO THE PROPOSITION OF MAKING LONGER THE RANGE OF WALL POTENTIAL IN FAVOR OF FIRST-ORDER WETTING TRANSITION
Authors: DING E-JIANG  ,   北京师范大学低能核物理研究所,北京,100875
Published: November 2020

The discussion on the theoretical models for the wetting transition up to now shows that making the range of wall potential longer tends to favor first-order wetting transition. To this proposition, however, a counter-example treated analytically is presented in the present paper.
EXPERIMENTAL INVESTIGATION MECHANISM ANOMALOUS HALL EFFECT OF n-Ge ABOVE ROOM TEMPERATURE
Authors: XING XU  ,   东北师范大学物理系,长春,130024
Published: November 2020

Since the discovery of specific anomalous electromagnetic character of n-Ge above room temperature, the inversion layer model has been very successful in theoretical investigation of anomalous Hall effect. However, up to now this model has not been verified experimentally. This paper reports this aspect of work.
HIGH BETA EFFECTS ON THE FLUTE LOWER HYBRID DRIFT INSTABILITY
Authors: WANG DE-ZHEN  , GUO SHI-CHONG  , CAI SHI-DONG  ,   (1)大连理工大学物理系,大连,116024; (2)中国科学院物理研究所,北京,100080,中国高等科学技术中心(世界实验室)
Published: November 2020

The high β flute lower hybrid drift (LHD) instability is studied in detail. The dispersion relation governing LHD mode with density, electron temperature inhomo-geneities and magnetic drift resonance is derived via gyrokinetic equations. It is found that when ▽Te//▽n the magnetic drift resonance related to ▽Te, enhances the instability and when ▽Te//▽n the resonance reduces the instability. In both cases, the finite βprovides a stability effects and shifts the largest growth rate point to the longer wave length. The analytical and numerical results are in good agreement. Electron temperature anisotropy gives no contribution to LHD mode.
STATISTICAL DESCRIPTION OF POLARIZATION STATES OF BROADBAND THERMAL LIGHT
Authors: LIU PEI-SEN  , QIN KE-CHENG  ,   (1)北京大学物理系,北京,100871; (2)北京理工大学工程光学系,北京,100081
Published: November 2020

Starting from the joint statistics of the orthogonal components of the broadband thermal light viberation, which are normal to the propagation direction of light wave, we derive the concept of polarization degree and the joint probability density functions of those two orthogonal components in various polarization states, so that an overall description of polarization of the broadband thermal light is obtained.
RADIATION TEMPERATURE OF LASER-PLASMAS EXPERI-MENTAL INVESTIGATION
Authors: TANG YONG-JIAN  , ZHENG ZHI-JIAN  , DING YAO-NAN  , FENG JIE  , CHEN XIAO-FENG  ,   中国工程物理院西南核物理与化学研究所,成都,610003
Published: November 2020

A method bas been developed for measuring radiation temperatures using a set of absorption-foils coupled to a soft X-ray streak camera in laser plasme experiments. A result has been given for a planar gold target irrdiatcd by laser (λ = 1.053μm) pulses of about 360ps in duration with average intensities of about 1014W/cm2 from the LF-11# Nd: glass laser facility. In addition, applications to measuring time-resolved spectra and space-resolved temperature are discussed.
LASER PLASMA X-RAY EMISSION FROM 5? TO 200?
Authors: WANG XIAO-FANG  , A. PACHTMAN  , XU ZHI-ZHAN  , CHEN SHI-SHENG  , LI YAO-LING  , QIAN AI-DI  ,   中国科学院上海光学精密机械研究所,上海,201800
Published: November 2020

This paper presents the studies of the dependence of soft X-ray emission on atomic-number and laser intensities by using a new diagnostic tool, pinhole transmission grating spectrograph (PTGS). Plasma X-ray spectra of various elements from Z = 6(C) to Z = 79(Au) produced by a laser beam with an average power density 5×l014W/cm2 reveal the strong dependence of X-ray emission on atomic number Z. Comparative experiments of Al or Au plasma X-ray emis-sion under both spot and line focused laser illumination show that changes of the laser intensity have more remarkable influence on low Z plasma X-ray emission than that on high Z.
LATTICE VIBRATION SPECTRA OF POLYMERS WITH NONDEGENERATE GROUND STATE
Authors: LING FAN  , WU CHANG-QIN  , SUN XIN  ,   (1)复旦大学物理系,上海,200433; (2)扬州师范学院物理系,扬州,225002
Published: November 2020

For the vibrational spectra of trans-(CH)x and Cis-(CH)x, in the region of weak electron-lattice coupling λ, the λ-dependences of optical phonons ω0(k = O) of these two isomers obey different rules. This is due to the existence of 3 confined potential barrier in the cis-(CH)x and thus causes the ground state to be non-degenerate.
EFFECTS OF HYDROGEN ATMOSPHERE ON LOSS CHARAC-TERISTICS OF OPTICAL FIBER
Authors: NING DING  , HU KAI-SHENG  , FU HUAI-JIE  ,   机械电子工业部电子材料研究所,天津,300220
Published: November 2020

Spectrum attenuation changes for MCVD optical fiber exposed to a hydrogen atmosphere at 100, 130, 150 and 180℃ are measured. The loss increases at 1.24 μm and 1.41μm due to molecular hydrogen and hydroxyl respectively are investigated. The empirical formula for time and temperature dependence of the loss increase are obtained from the experimental results. The loss increase at 1.3 μm and 1.55μm, at room temperature are estimated.
THE SUB-STEPS OF I-V CHARACTERISTICS IN JOSEPHSON JUNCTION
Authors: LIU ZENG-RONG  , JIANG XIA-MEI  , HUN ZHI-BIN  , GU GUO-QING  ,   (1)上海机械学院系统工程系,上海,200093,中国高等科学技术中心(世界实验室); (2)苏州大学数学系,苏州,215006; (3)中南民族学院数学系,武汉,430074
Published: November 2020

On the basis of Ref. [1] , we analyse the sub-steps of I-V characteristics in Josephson junction theoretically. Firstly, a mathematical method is developed, then the conditions of existence of sub-steps are obtained by that method. Our results make the discussion for I-V characteristics in Josephson junction perfect.
ENHANCEMENT OF SQUEEZING AND SUPERPOSITION STATES
Authors: ZHU KAI-CHENG  , WANG QIN  , YAN ZHAN-XIAN  ,   湖南吉首大学物理系,吉首,416000
Published: November 2020

A way is presented with which the optical field states exhibiting much deeper squeezing can be achieved through a simple superposition of the vacuum and the squeezed states with smaller squeezing. The enhancement effect of squeezing and the antibunching effect exhibiting in the superposition states depend on the average photon number of the squeezed states and, are very remarkable for the field exhibiting much smaller squeezing.
ANALYSIS OF RESULTS OF CHINESE FIRST EXPERIMENT ON GaAs SINGLE CRYSTAL GROWTH IN SPACE
Authors: HUANG LIANG-FU  , XIE XIE  , TAN XIAO-CHEN  , ZHANG ZHONG-LI  , HE PING  ,   中国空间技术研究院兰州物理研究所,兰州,730000
Published: November 2020

By the method of remelting and recrystalization, the GaAs single crystal doped with Te grew from the floating melt in microgravity environment in space. The GaAs single crystal broke in the middle, showing that the long floating melt was not stable. No impurity striations were found in the middle part of the crystal, which indicated that buoyancy-driven convec-ion disappeared, but they were observed on he outer layer of the crystal, showing that there existed Marangoni convection. The control of segregation mechanism of impurities in the short melting zone and the volatilization of Te impurity from the melt resulted in the decrease of impurity contents and nonuniform macroscopic distribution of impurities in the crystal. The dislocation defect in the crystal was due to the thermal stress caused during rapid growth and the collapse of vacancy clusters at the side of interface seed crystal.
STUDY ON A SPECIAL DEFECT IN KTP CRYSTAL
Authors: TIAN LIANG-GUANG  , JIANG XIAO-LONG  , LI RUN-SHEN  , XU SHUN-SHENG  , LIU YAO-GANG  ,   (1)山东大学晶体材料研究所,济南,250100; (2)中国科学院上海冶金研究所,上海,200050
Published: November 2020

There is a special area in KTP crystal, in which the SHG efficiency is obviously increased. In this paper, the KTP crystal is studied by means of Synchrotron Radiation (SR) White Beam Topography, and a planar defect is found in such an area. The lattice is deformed because of the accumulation of impurity in this area, which results in the increase of SHG efficiency. The maximum strain direction is determined to be R=〈010〉 according to the extinction condition of planar defect.
A STUDY ON MANGETO-OPTICAL PROPERTIES AND INTERFERECT EFFECT OF Bi SUBSTITUTED DyIG SPUTTERED THIN FILMS
Authors: SHEN DE-FANG  , DU TENG-DA  , WANG LI-JUAN  , ZHANG WEI-ZHU  ,   中国科学院上海冶金研究所,上海,200050
Published: November 2020

Bi substitute DyIG thin films having high coercive force and good squareness have been prepared on glass substrates by sputtering. The Faraday rotation amounts to about 7.5°/μm at wavelength of 500 nm. The magnetic domains are stable after thermal magnetic recording. The interference of magnetooptical thin films is investigated when the surface of films is deposited with different metals. Using this charecteristics the optimum disign for garnet recording discs can be achieved.
FREQUENCY LOCKING, QUASIPERIODICITY, SUBHARMONIC BIFURCATIONS AND CHAOS IN HIGH FREQUENCY MODULATED STRIPE GEOMETRY DH SEMICONDUCTOR LASERS
Authors: Zhao Yi-guang  ,   北京大学物理系,北京,100871
Published: November 2020

The method of obtaining self-consistent solutions of the field equation and the rate equations of photon density and carrier concentration has been used to study frequency locking, quasiperiodicity, subharmonic bifurcations and chaos in high frequency modulated stripe geometry DH semiconductor lasers. The results show that the chaotic behavior arises in self-pulsing stripe geometry semiconductor lasers. The route to chaos is not period-double, but quasiperiodicity to chaos. All of the results agree with the experiments. Some obscure points in previous theory about chaos have been cleared up.
SPIN-ORBIT COUPLING PARAMETER MODEL OF g FACTOR FOR Ni2+-6X-CLUSTERS
Authors: DU MAO-LU  , CHEN JIA-JUN  , CHEN KANG-SHENG  ,   (1)成都地质学院应用化学系,成都610051; (2)四川师范大学固体物理研究所,成都610066; (3)四川师范学院物理系,南充637002
Published: November 2020

This paper presents a two spin-orbit (SO) coupling parameter model of g factor for Ni2+-6X- clusters. Using this model, the g factors of NaCl:Ni2+ and NaBr:Ni2+ are calculated. The molecular orbitial coefficients are determined by means of a semiempirical method in calculation of the g factors. The results show that the contribution from the SO coupling of ligand ions to the g shifts can not be neglected for ligand ion possessing large SO coupling constant such as Br- or I-. This suggests that the calculation of g factor in some covalent crystals containing trasition metal ions should use the two SO coupling parameter model but not the classical crystal field model including only the contribution from the SO coupling of central transition metal ions.
A STUDY ON Sn4+ CATION EXCHANGE NATURAL ZEOLITE TREATED AT DIFFERENT TEMPERATURES
Authors: WU YONG-HUA  , LI HUI-XIANG  , WANG DA-ZHI  , ZHANG DAO-YUAN  ,   (1)中国科学技术大学材料科学与工程系; (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
Published: November 2020

The samples of Sn4+ zeolite are obtained by cation exchange between natural zeolite and SnCl4, and then treated at different Temperatures (70-1000℃). By using Mossbauer spectroscopy, X-ray diffraction and infra-red spectroscopy, we studied the change of position of Sn4+ in the zeolite structure with the temperature. The results show that the Sn4+ is situated in the main duct (channel) of the zeolite structure, but with the increase of the temperature the zeolite is dehydrated gradually, then the Sn4+ begins to move from the center of the duct to the walls of the duct, consequently, owing to the increase of the asymmetry of the electric field where the Sn4+ is situated, the quadruple splitting increases with the increase of the temperature. At the same time the SnO2 component increases with the increase of temperature. When heat-treatment temperature reached 1000℃ the long range order structure of zeolite may be destroyed completely.
THERMAL STABILITY OF REACTIONS OF TRANSITION METALS WITH GaAa
Authors: ZHAO YUE-CHAO  , XIAN DING-CHANG  ,   北京同步辐射国家重点实验室,中国科学院高能物理研究所,北京100039
Published: November 2020

In this paper, the formation enthalpies of the final phases presented in annealed contacts composed of transition metals (Pd, Pt, Ni, Ir, Rh, Co, Ti, Cr, V, Zr) and GaAs are calculated by using Miedema's semi-empirical model. Furthermore, the free energies of reaction both for the formations of the final phases and for the decompositions of the final phases containing As are calculated. These calculated results are compared with the experimental values. We reach the conclusion that for most of the above systems, the free energies of reaction can be adopted to assess the formation temperatures and the stabilities for the final phases.
XPS STUDIES OF Bi2Sr2CaCu2-xLixOy CERAMICS SERFACES
Authors: CHEN XIAN-HUI  , QIAN YI-TAI  , CHEN ZU-YAO  , ZHO JUN-HUA  , JI MING-RONG  ,   (1)中国科学技术大学结构成分分析中心,合肥230026; (2)中国科学技术大学应用化学系,合肥230026
Published: November 2020

The XPS(X-ray photoelectron spectroscope) measurements of the 80K phase Bi-Sr-Ca-Cu-Li-O ceramics were carried out on surfaces obtained by polishing in ultrahigh vacuum. The results show that the chemical bond natures of Bi and Sr almost did not change, but the binding energies of Ca, Cu and O shifted apparently toward higher energy when Li doped in the Bi-Sr-Ca-Cu-O system. The XPS spectrum of O Is has only singe peak (528.8eV) from clean surfaces polished in vacuum and consists of the OH (531eV) and OL (528.8eV) components from conventionally polished surfaces.
DYNAMIC LASER SPECKLES PRODUCED BY DOUBLE LIGHT BEAMS
Authors: YAO KUN  , XU GUANG-YU  , GUO GUANG-CAN  , PENG HU  , ZHOU PEI-LING  ,   (1)中国科学技术大学电子技术基础部,合肥,230026; (2)中国科学技术大学物理系,合肥,230026
Published: November 2020

In this paper we derive the time-space correlation funotion of dynamic speckles produced by double light beams. An experiment using photon correlation method is performed, the result accords well with the expectation of the present theory.
REFLECTION AND TRANSMISSION OF PICOSECOND SOLI-TON AT INTERFACE SEPARATING TWO MEDIA IN OPTICAL FIBER
Authors: CHEN LU-JUN  , LIANG CHANG-HONG  , WU HONG-SHI  ,   西安电子科技大学,西安,710071
Published: November 2020

The governing equations and boundary conditions for reflection and transmission of picosecond soliton at the interface between two media in optical fiber is developed by radial mode averaging method with slowly varing envelope and quasi-monochromatic approximations. The proccess of reflection and transmission is numerically simulated by using beam-propagating method and some numerical examples are given.
ELECTRON SPIN RESONANCE STUDY ON RADIOLYTIC DAMAGE IN BaCl2 CRYSTALLITE
Authors: HOU BI-HUI  , YANG BING-XIN  , SHI CHAO-SHU  , LIANG REN-YOU  , LU XIAO-PU  ,   (1)中国科学技术大学结构分析开放研究实验室,合肥,230026; (2)中国科学技术大学近代物理系,合肥,230026; (3)中国科学技术大学物理系,合肥,230026
Published: November 2020

The x-ray and γ-ray radiolytic damage in luminous host material BaCl2 and its recovery have been studied by the electron spin resonance method. It is found that the x-ray radiolytic damage in the sample can be recovered completely under sunlight for only two minutes, but the complete recovery of γ-ray damage is not easy.
LANGEVINIAN THEORY OF TWO-PHOTON LASERS BY OPTICAL PUMPING
Authors: HU XIANG-MING  , WANG DE-XIN  ,   华中师范大学物理系,武汉,430070
Published: November 2020

In this paper, a two-photon laser by optical pumping, with two-photon losses, is studied by means of the Langevinian theory, the langevinian equation is obtained. Then the steady-state average photon number, the frequency pulling, the linewidth and the dynamical Stark effect are obtained. From the analysis of the gain, it is shown that, for the incoherent pumping, only the two-step process of single-and two-photon gives contribution. And for the coherent pumping, in addition, the one-step process of single and two-photon also contributes. And two processes are confined by the negative-feedback and saturation. The linewidth is independent of the steady state average photon number.
POSITRON ANNIHILATION CHARACTERISTICS OF HYDRO-GEN-VACANCY COMPLEX IN ALUMINUM
Authors: WANG XIAO-GANG  , ZHANG HONG  ,   中国科学院上海冶金研究所,上海,200050
Published: November 2020

The positron annihilation characteristics of one hydrogenvacancy complex and many hydrogens-vacancy complex in aluminum have been calculated, using the discrete variational method, embedded-cluster model based cm the first-principles and a fully-three-dimensional numerical relaxation technique. The possible location of hydrogen atom in the single vacancy in aluminum is discussed.
SYMMETRY IN CANONICAL FORMALISM OF CONSTRAINED SYSTEM
Authors: LI ZI-PING  ,   北京工业大学应用物理系,北京100022
Published: November 2020

We have derived the generalized Noether's first theorem in canonical formalism for field theory with singular Lagrangian and generalized Noether's identities in canonical formalism for variant Lagrangian. The application to the Dirac's constraint theory was discussed. We point out that some variance system may has a Dirac constraint. A counter-example to a conjecture of Dirac was given which indicates that Dirac's conjecture is invalid in this example. The application of generalized Noether's identities to the chromodynamics is also discussed.
TEMPORAL PROFILE AND LINEWIDTH OF THE COHERENT HARMONIC EMISSION GENERATED BY THE FUNDAMENTAL MODE BUNCHING
Authors: DING WU  ,   北京应用物理与计算数学研究所,北京100088
Published: November 2020

Tn this paper, we have obtained the power expression of the coherent harmonic emission generated by the fundamental mode bunching, and explained their temporal profile and line-width.
IRRADIATION EFFECT WITH SLOW NEUTRONS OF LOW FLUENCE ON Bi-BASED SUPERCONDUCTORS
Authors: JIN JI-RONG  , CHEN WU-MING  , JIN XIN  , ZHANG YI-TONG  , LU MU  , JI HE-LIN  , LIU XIN-HU  , YAO XI-XIAN  , YI MIN-YU  , HONG CANG-SHENG  , WAN TAO-YU  , FANG JUN-REN  ,   (1)长沙矿业冶金研究院,长沙410012; (2)南京大学物理系固体微结构国家重点实验室,南京210008
Published: November 2020

Effect of slow neutron irradiation of low fluence on bismuth-based superconductors is studied. It's shown through experiments that (1) both critical current density Jc and zero-resistance temperature Tc0 are increased, though to different extents, after the Bi-based superconductors were irradiated with slow neutrons to suitable fluence and (2) slow neutrons of low fluence and fast neutrons of high fluence have similar irradiation effects on Bi-based superconductors.
THE ROLE OF INTERNAL STRESS IN THE AMORPHIZATION PROCESS DURING MECHANICAL ALLOYING
Authors: MIAO WEI-FANG  , LI GU-SONG  , LI SHU-LING  , WANG JING-TANG  ,   中国科学院金属研究所,沈阳110015
Published: November 2020

The characteristics of amorphization process during mechanical alloying of the mixture of Ni and Zr powders have been studied by differential scanning calorimetry (DSC) and X-ray diffraction measurements. The role of internal stress in the amorphization process, together with the variation in internal stress are discussed.
STUDY ON WETTING TRANSITION IN A MIXTURE FLUID(Ⅱ)——BINARY SYSTEM AT THREE PHASE COEXISTENCE
Authors: SONG YAN  , DING E-JIAN  , HUANG ZU-QIA  ,   (1)北京师范大学低能核物理研究所,北京100875; (2)中国科学院理论物理研究所,北京100080;北京师范大学低能核物理研究所,北京100875
Published: November 2020

With Sullivan model as a start point, analysis study for the nature of wetting transition in binary system at three phase coexistence, the typical binary mixture, is conducted by means of trajectory expansion in dynamics approach, from which we modify and make supplements for our previous results.
STRUCTURE DETERMINATION OF HCOO-Cu(110) BY MULTIPLE SCATTERING CLUSTER METHOD
Authors: TANG JING-CHANG  , FU SONG-BAO  , JI HONG  , CHEN YI-BING  ,   (1)杭州汽车发动机厂职工大学,杭州310007; (2)浙江大学物理系,杭州310027
Published: November 2020

Using the multiple scattering cluster method (MSC), we have calculated the oxygen K-edge NEXAFS spectra of formate molecule which is the intermediate in the catalytic decomposition of formic acid over Cu(110) surface. The calculation shows that the formate is adsorbed at the short-bridge site of Cu(110) surface, the bond-lengths LC-0 and LCu-o are 1.26±0.01? and 1.975±0.02? respectively, the O-C-O bond angle is in the range of 130°-134°. This result agrees with that of photoelectron diffraction, and demonstrates that the multiple scattering cluster method is an effective one for the surface structure determination.
HEAVY ELECTRON METALS IN A NONZERO MAGNETIC FIELD
Authors: CHEN CHUN  , LI ZHENG-ZHONG  , XU WANG  ,   南京大学物理系,南京210008
Published: November 2020

The specific heat coefficient and magnetization of the heavy electron metals in a nonzero magnetic field are calculated by using the slave boson mean field theory. The results indicate that the heavy fermion feature of the system is depressed in the magnetic field. A theoretical explanation for anomalous volume magnetostriction of the heavy electron metals is also given in this paper.
UNIFORMIZATION IN RIEMANN SURFACES AND LIOUVILLE FIELD THEORY
Authors: SHEN JIAN-MIN  , SHENG ZHENG-MAO  , LI YOU-QUAN  ,   (1)杭州大学物理系,杭州310028; (2)浙江大学浙江近代物理中心,杭州310027
Published: November 2020

The monodromy of Liouville field in the punctured Riemann sphere is disc us-sed. The exchange algebras and exchange matrix of the field are obtained by means of uniformization in Liouville theory. A relation between the exchange matrix and SL(2n,R) is also presented.
GLAUBER COHERENT STATE q-DEFORMED QUANTUM OSCILLATOR
Authors: HAO SAN-RU  ,   长沙水利电力师范学院物理系,长沙410077
Published: November 2020

By making use of the Fock States of the q-deformed quantum oscillator which possesses the symmetry of quantum group, we construct the Glauber coherent state of the q-deformed quantum oscillator (the q-Glauber coherent state ㄧα>q). We discuss the of completeness properties, particle number distribution, oscillator strength distribution and the minimal uncertainty principle of the q-Glauber coherent states, and point out that the coherent degree of the q-Glauber coherent state can be described by the parameter q.
EFFECT OF INTERSUBBAND IMPURITY SCATTERING IN TWO DIMENSIONAL DISORDERED ELECTRON SYSTEMS
Authors: YANG YONG-HONG  , XING DING-YU  , GONG CHANG-DE  ,   南京大学物理系理论物理中心,南京210008
Published: November 2020

By using the Green's function method, we have studied effect of intersubband impurity scattering on the quantum correlation of conductivity and Hall coefficient. It is shown that crossover behaviors appears in both coductivity and Hall coefficient when the situation changes from one-subband occupation to two-subband occupation.
STUDIES OF INTERFACE ATOMIC STRUCTURE OF Al2O3/Al(100) BY MeV ION SCATTERING AND CHANNELING
Authors: CHENG HUAN-SHENG  , YAO XIAO-WEI  , YANG FU-JIA  ,   上海复旦大学物理二系,上海,200433
Published: November 2020

The experimental method for studying interface atomic structure between amorphous layer and crystal by MeV ion scattering and channeling is described. This method is applied . to study the Al2O3/Al(100) interface. Thin Al oxide film are formed on clean Al(l00) surface in pure oxygen ambience at 400℃. The experimental results show that the composition of the oxide film is precisely Al2O3, and the interface between Al oxide film and Al(l00) bulk is very sharp, the reconstructive layer under the Al2O3 film is no more than one monolayer. Monte carlo simulations indicate the distance between displaced Al atoms on the reconstuctive layer and Al〈l00〉axis is 0.18 A. At room temperature, the oxygen adsorption layer of Al〈l00〉 is primarily stoichiometric A1O at low surface coverages.
DYNAMIC THEORY FOR DISORDERED SUPERCONDUCTIVITY
Authors: YI LIN  , YAO KAI-LUN  ,   (1)华中理工大学物理系,武汉430074; (2)中国高等科学技术中心(世界实验室),北京100080
Published: November 2020

The dynamic theory for disordered superconductivity is suggested based on the fracton-electron interaction. It has been demonstrated that electrons in disordered superconductors can feel an attractive interaction by exchange of virtual fractons. A normal state is unstable with respect to such an interaction, and a superconducting state is formed through the association of electrons in pairs with opposite wave vectors and spins. The critical temperature for percolation superconducting model can be derived from this theory.
X-RAY DOUBLE-CRYSTAL DIFFRACTION AND TOPOGRAPHY STUDY OF STRAIN RELAXED InGaAs/GaAs SUPERLATTICES
Authors: LI JIAN-HUA  , MAI ZHEN-HONG  , CUI SHU-FAN  ,   中国科学院物理研究所,北京100080
Published: November 2020

In this paper, strain relaxed InGaAs/GaAs strained-layer superlattice has been studied by X-ray double-crystal diffraction and topography. By simulating the double-crystal rocking curves using X-ray dynamical scattering theory, important imformation such as the structure, the mechanism and degree of strain relaxation, the misorientation between the superlattice layers and the substrate and misfit dislocation density, and so forth are obtained. The misfit dislocation distribution at the interface between the superlattice layers and the substrate and in the superlattice layers are observed by double-crystal topography.
ELECTRONIC STRUCTURE OF MOLECULAR RYDBERG STATES OF SOME SMALL MOLECULES AND MOLECULAR ION
Authors: SUN BIAO  , LI JIA-MING  ,   中国科学院物理研究所,北京100080
Published: November 2020

Based on an independent-particle-approximation (i.e. the multiplescattering self-consistent-field theory), we studied the electronic structures of Rydberg states of the small diatomic molecules H2, He2 and the He2+ molecular ion. The principal quantum number of the first state of the Rydberg series is determined from a convention of the limit of the molecular electronic configuration. The dynamics of the excited molecules and molecular ion has been elucidated. Our theoretical results are in fair agreement with the existing experimental measurements, thus they can serve as a reliable basis for future refined treatment such as the configuration interaction calculation.