bluuebunny/crossref_metadata_2025 huggingface dataset:
NORMAL-MODE SOUND FIELD OF DIRECTIONAL RADIATOR
Authors: Zhang Ren-he  , Zhu Bai-xian  ,   中国科学院声学研究所
Published: November 2020

In this paper, the sound field of a more general directional radiator in a stratified medium is treated, and the concept of directivity is applied to calculation of the normal modes. The result shows that the normal-mode field of a directional radiator can be obtained by supplementing the normal-mode expression of a omnidirectional point source with the directivity-excitation-function, which is dependent on the position and directivity of the radiator. In addition, the normal-mode fields of the radiators with vertical-symmetrical, vertical-antisymmetrical, single-side and sharp directivity are calculated, respectively.For the vertical line array in a homogeneous water-layer, if the source distribution is proportional to the eigenfunction of some normal mode, the zeros of the directivity-excitation-function are just corresponding to the directions of eigen-rays of other normal modes.
THE RECOMBINATION BEHAVIOR OF PLATIUM IN SILICON
Authors: Zhou Jie  , Li Shu-ying  , Tan Fei  ,   中国科学院半导体研究所
Published: November 2020

With dark capacitance transient method, electron emission and capture transient processes at deep level, which is located within an energy range of KT above EF in depteled region of zero-biased junction, have been observed in Pt diffused deep diffsion junction of n-Si and p-Si with different background doping density. These transient behaviors agree with the solution of electron variation rate equation of deep level for different initial conditions at that place.In this paper, a machanism is also proposed to explain the occurrence of emission transient. It is considered that the origin of emission transient is closely related to the structure in the deep diffusion junctions and the capture transient to the capture characteristic of different impurity.
THE MODULATION INSTABILITY AND THE COLLAPSE PROCESS OF WAVE PACKET IN PLASMA
Authors: HE XIAN-SHI  ,   中国科学院原子能研究所
Published: November 2020

In this paper, the expressions of the high-frequency and low-frequency nonlinear currents that leads to strong turbulence formation in plasma were found by using Kinetic theory. According to the system of equations in the reference [2] which included pondermotive force, self-generated magnetic field and their damping effects, we generalized the modulation instability analysis given by Kono et al. and obtained the expressions of growth rate parameter etc. in various cases while the longitudinal and transverse waves were excited by Langmuir or transverse pump waves. Finally, we discussed the collapse dynamics of wave packet and extended the collapse argument on nonlinear Schrodinger equation to the case of the density and field coupling equation system.
THE NONEQUIVALENCE OF x-AXIS AND y-AXIS FOR RAMAN SPECTRA OF UNIAXIAL CRYSTALS
Authors: LIU SI-MIN  , ZHANG GUANG-YIN  ,   南开大学物理系
Published: November 2020

In this paper, we show that in Raman spectrum of uniaxial crystals, for nonpolar mode and A(z) (or B(z)) mode, under any scattering geometry, x-axis and y-axis are always equivalent. For polar mode E(x) and E(y), in the tetragonal and hexagonal crystal systems, x-axis and y-axis are equivalent in most cases; but in the trigonal crystal system, they are equivalent only in a few cases.
DETERMINATION OF THE COMPLETE SET OF ELECTROELASTIC CONSTANTS OF FERROELECTRIC CRYSTAL (K0.20Na0.20Sr0.60Ba0.20)Nb2O6
Authors: Xu Yu-huan  , Chen Huan-chu  ,   (1)山东大学晶体研究所; (2)中山大学物理系
Published: November 2020

This paper discusses the measuring method and the measuring program of all of the dielectric, elastic and piezoelectric constants of ferroelectric single crystal (K0.20Na0.20Sr0.60Ba0.20)Nb2O6. This crystal was first grown by the authors. All 53 date of the dielectric, elastic and piezoelectric constants and some of the electromechanical coupling factors are published for the first time. Most of these date are measured in accordance with "IRE Standards on Piezoelectric Crystals" except that elastic coefficients S66 and S13 are measured by the thickness shear mode of the (zxl) 45° specimens and the length extensional mode of the (xzt) 45° bars respectively. The measuring accuracies are also discussed.
A STUDY OF SYNTHETIC DIAMOND SURFACE USING REFLECTION ELECTRON MICROSCOPY
Authors: Kang Zhen-chuan  ,   北京市冶金研究所
Published: November 2020

The surface of synthetic diamond have been observed employing reflection electron microscopy with both TBM and STEM instrument. It is found that there are slip steps of screw dislocations, growth steps and microcrystals on the surface. The result shows that the surface of sythetie diamonds is characteristic of crystallization from solution.
TEMPERATURE DEPENDENCE OF RETROGRADE VELOCITY OF VACUUM ARCS IN MAGNETIC FIELDS
Authors: FANG DAO-YU  ,   复旦大学电光源研究所
Published: November 2020

Using optical method the retrograde velocities of vacuum arcs in magnetic fields were measured as a function of the cathode temperature for Cu, Al and 316 stainless steel used as the cathode material. It was found that with increasing the cathode temperature the arc velocity decreases. The experimentally measured temperature dependence of retrograde velocity of vacuum arcs can be explained by the ion jet model for retrograde motion of vacuum arcs.
ENERGY TRANSFER OF THE EXCITON IN THE QUASI-ONE-DIMENSIONAL ANTIFERROMAGNET CsMnCl3·2D2O
Authors: JIA WEI-YI  , YAN. W. M.  ,   (1)Dept. of Physics,University of Wisconsin-Madison,U. S. A.; (2)中国科学院物理研究所
Published: November 2020

The dynamic processes, of energy transfer of the 4T1 exciton of Mn2+ ions have been studied in the temperature region 2-300 K in the pure and Mg2+-, Ni2+-, Co2+-doped quasi-one-dimensional antiferromagnet CsMnCl3·2D2O (CMC). It has been found that the fluorescent intensity and the lifetime of the exciton drops rapidly with increasing temperature in the region 2-10 K, with a further weakened fluorescence and shortened lifetime in the heavily doped crystals. These phenomena are presumed to be associated with the multiphonon nonradiative transition and energy transfer between donors and acceptors, both of which are related to the magnetic interactions and the spin ordering. At higher temperature, the rate of energy transfer increases. However, because of the persistence of spin short-range order and the Jahn-Teller effect, the energy transfer among donors is still limited to some extent, and nonexponential attenuation processes appear. The different impurities show different abilities of trapping and relaxing to a certain degree.
STUDIES OF HYDROGEN ADSORPTION ON Al(111) AND Ag(111) SURFACES BY EHT METHOD
Authors: XU YONG-NIAN  , ZHANG KAI-MING  ,   复旦大学现代物理研究所
Published: November 2020

The hydrogen adsorption on Al(111) and Ag(111) surfaces have been studied by the charge self-consistent EHT method. It is shown that the H2 molecule would dissociated on Al(111) surface, the H atom could be adsorbed at certain sites with symmetric geometry (such as the threefold, eclipsed, bridge and the atop sites), and H could penetrate into the surface layer and become an interstitial atom. However it is shown that the H2 molecule can be adsorbed on Ag(111) surface with H-H bond paralled to the surface, this result seems to be in fairly good agreement with the result of high resolution electron-energy-loss spectra for H2 on Ag at low temperature. In addition, when the temperature is high, the dissociative adsorption of H2 on Ag(111) surface is also possible.The merit of the method used is discussed.
A STATISTICAL THEORY OF THE TWO-DIMENSIONAL ALTERNATIVE BINARY SYSTEM
Authors: DU YI-JING  , YAN ZU-TONG  , CHEN LI-RONG  ,   安徽师范大学物理系
Published: November 2020

The two-dimensional alternative binary system is studied by using the Collins model. The free energy of the system is calculated. The equation of the solubility curve is given. Using the condition of phase equilibrium, the phase diagrams of the two-dimensional alternative binary system are obtained, Finally, a dicussion on the results are presented.
THE HEXAGONAL METASTABLE PHASE FORMED IN AN AMORPHOUS Ni-P ALLOY DURING CRYSTALLIZATION (Ⅲ)——HEXAGONAL POLYTYPE
Authors: LIANG JIN-ZHONG  , LAI ZONG-HE  , WU YU-KUN  , GUO KE-XIN  ,   中国科学院金属研究所
Published: November 2020

By tilting the crystals formed in an amorphous Ni-P alloy during crystallization in transmission electron microscope, two further hexagonal metastable phases (a2 and a3) have been discovered. Their lattice parameter a has the same value (6.73?) as that of the previously reported hexagonal metastable phase (a1), but the values of the other lattice parameter c are 3/2 and 4 times respectively of that of the phase a1. This shows that these phases are longperiod polytype structures. Furthermore, the previously assumed F.C.C. sublattice (a=5.50?) of a1 has been found to be really metastable phase from {111} planes of which these hexagonal metastable phases are formed.
A LONG PERIOD STRUCTURE 21R IN Co-Al ALLOYS
Authors: ZHANG GUO-GUANG  , LI WAN-TONG  , GUO KE-XIN  ,   (1)北京钢铁学院; (2)中国科学院金属研究所
Published: November 2020

During the martensitic transformation of Co-Al alloys stacking faults occur abundantly and sometimes a local ordered 21R structure can be found by electron diffraction and lattice imaging techniques. It is shown that optical diffraction method is a useful means of studying this kind of local ordered structure.
SOUND ATTENUATION IN METALLIC SUPERLATTICES
Authors: YANG RUI-QING  , XIONG SHI-JIE  , CAI JIAN-HUA  ,   (1)南京大学固体物理研究所; (2)南京大学固体物理研究所,上海交通大学物理系
Published: November 2020

Following the line of our interpretation of the conduction behavior of metallie su-perlattices, we have studied the attenuation of sound waves in such artificial materials, with special emphasis on the dependence upon the modulation wavelength. Acoustical experiments may help to justify the physical mechanism of transport processes suggested in [1].
A STUDY ON MIGRATION OF Li IONS IN α-LiIO3 SINGLE CRYSTAL UNDER AN ELECTROSTATIC FIELD APPLIED ALONG THE c-AXIS BY 6Li (n, α)t NUCLEAR REACTION
Authors: YANG TONG-HUA  , BAO ZONG-YU  ,   中国科学院原子能研究所
Published: November 2020

The detailed information about the migration of Li ions under an DC electric field applied along the c-axis of an α-LiI03 single crystal has been obtained by analysing the spectrum of the nuclear reaction 6Li (n, α)t in the single crystal bombarded by thermal neutrons. The migration of Li ions in the crystal can be continuously studied non-destructively by this method. The results show that the Li ions have migrated into Al-electrode when 0.1 Columb of charge is accumulated and have penetrated the Al-electrode at 0.3 Columb. The relutive density of the Li ions at various depth in the single crystal have also been measured versus different amount of accumulated charge.
CRYSTALLIZATION PHASES IN AMORPHOUS Ni-P ALLOY
Authors: LAI ZONG-HE  , WU YU-KUN  , GUO KE-XIN  ,   中国科学院金属研究所
Published: November 2020

Vafaei-Makhsoos claimed to have discovered three new Ni3P phases in crystallized Ni-P amorphous alloy. By analysis of his experimental data as well as our own electron diffraction experiments, it is shown that the various electron diffraction patterns of the so-called new Ni3P phases are in fact all belonging to Ni12P5. Thus it is clear that there are seven crystallization phases in annealed amorphous Ni-P alloys: metastable fcc phase α (α=5.48?), metastable hexagonal polytypes α1,α2,α3 transformed from α, bct Ni12P5, bct Ni3P and Ni solid solution.
SUPERCONDUCTING PROPERTIES OF GETTER SPUTTERED Mo1-xSix FILMS
Authors: ZHAO ZHONG-XIAN  , MENG RU-LING  , ZHOU PING  , LI LIN  ,   中国科学院物理研究所
Published: November 2020

The superconductivity properties of four Mo1-xSix thin films were measured. The results of superconducting transition temperatures, the critical magnetic fields near Tc, the critical current densities at 4.2 K and room temperature (300K) and low temperature (8 K) resistivity measurements indicated that the four samples showed characteristic features of amorphous films, the Mo78Si22 film showed better ‘ amorphousness' among them.
A COMMENT ON THE REASONS FOR THE FAILURE OF MULTAN
Authors: YAO JIA-XING  ,   中国科学院物理研究所
Published: November 2020

MULTAN-multisolution tangent formula procedure is based on the probability distribution of three phase invariants. Based on this distribution, we analyzed how a small starting set, the main weakness of MULTAN, effects the process of phase development and refinement by the tangent formula. The reason of MULTAN failure and the approach to overcome the disadvantage of small starting set are discussed here. The principle and advantage of RANTAN-random MULTAN is elucidated briefly and compared with MULTAN in fourexamples.
SCATTERING OF ELECTRONS BY SCREW DISLOCATIONS IN SILICON CRYSTALS
Authors: HUANG HENG-JI  , YASUNARI ZEMPO  ,   (1)广岛大学物性系; (2)延边大学物理系
Published: November 2020

In this paper, the scattering of electrons by 〈110〉-screw dislocations insilicon crystals is discussed. We use the tight-binding approximation, only electrons in the s and p state are taken into account. With the long wave length approximation, only scattering of electrons near Г in the first BZ is considered. A scattering theoretical approach yields an integral equation of Kirchh off-Huygens type. The scatlering equation has been solved by means of gauge transformation and Green's function. It is confirmed that, as in the ease of single band in the case of many bands the shadow, which is the region that can not be affected by electron flux, appears in the down stream side of dislocations as well.
AN INVERSE CHERENKOV FOCUSING LASER ACCELERATOR
Authors: ZHUANG JIE-JIA  ,   中国科学院高能物理研究所
Published: November 2020

The principle of the inverse cherenkov focusing laser accelerator is presented. It is readily shown, by studying the dynamics of the charged particles, that the particles are accelerated steadily and continuously when the condition of the cherenkov radiation is satisfied, and need no additional focusing systems since the laser field on the focusing axis is just the accelerating field, so that the intensity of the latter may be higher than that in the previously proposed inverse cherenkov laser accelerator. The limitations of this accelerating mechanism are also discussed.
STUDY OF ACOUSTICAL NONLINEARITY B/A IN BIOLOGICAL MEDIUM
Authors: FENG RUO  , GONG XIU-FEN  , ZHU ZHENG-YA  , SHI TAO  ,   南京大学声学研究所
Published: November 2020

By using insert substitution method, the acoustical parameter of nonlinearity B/A have been determined for a series of liquid biological samples: porcine whole blood, bovine whole blood, milk and aqueous solutions of polyethylene glycol of various molecular weight. The values of B/A for solutions of PEG increase linearly with solute concentration and exhibit no evident dependence on solute molecular weight.
ON CONVECTIVE EFFECTS IN GAS LASERES
Authors: GAO ZHI  ,   中国科学院力学研究所
Published: November 2020

The convection of the gain medium is a decisive factor for large increase in power output of gas lasers. The present analysis shows that both the saturation intensity and the laser power density (or the small-signal gain coefficient) by which CW laser is characterized increase nonlinearly with the flow speed and tend to the respective limiting values. It is also shown that the increment of the saturation intensity does not go beyond about 10 times, and a large increase in power density is caused by the accumulation of excited energy in the flowing gas. These results are not the same as those of the currently accepted theory which predicts that the saturation intensity increase linearly and unlimitedly with flow speed, and a large increase in power density is due to a large increase in the saturation intensity. The present quantitative results of the variation of the saturation intensity with the gas flow transient time are consistent with the experimental data of the flowing CO2 gas lasers, where the gas flow transient time denotes the time required for the flowing gas to move across the gas gain region, or the probing-beam section.
DEEP INELASTIC SINGLET STRUCTURE FUNCTIONS AND SCALING VIOLATION
Authors: LI WEN-ZHU  , HU BING-XUN  ,   浙江大学物理系
Published: November 2020

The flavour singlet structure functions of deep inelastic scattering processes can yield more decisive tests of QCD than the non-singlet. We give analytical expression for flavour singlet structure functions through analysing the lepton-nucleon deep inelastic scattering processes by means of QCD and using Jacobi polynomials. This expression contains 4 to 5 parameters and shows the changes of the singlet structure functions with x and Q2 very well. In QCD leading order, the conclusion is in reasonable agreement with experimental data.
GREEN FUNCTION METHOD FOR CALCULATING INFRARED SPECTRUM OF ONE-DIMENSIONAL TWO-BLOCK CRYSTAL
Authors: ZHOU QING  ,   中国科学院化学研究所
Published: November 2020

In this article, the Green Function method has been employed to investigate the infrared spectrum of one-dimensional twobloek crystal A-E. Assuming that the Green Functions of the blocks are known, we first derive the matrices and the Green Functions of the crystal and then investigate some quantities important to infrared spectrum of the crystal, including (1) the density of states, (2) the eigenfrequencies of the crystal, (3) the normal displacements of atoms in the crystal, (4) infrared absorption intensity and (5) peak width.
THE PROPERTIES OF THE SURFACE LAYER OF LiNbO3 CRYSTAL AFTER LOW-ENERGY ION BOMBARDMENT
Authors: FENG XI-QI  , REN CONG-XI  , LI CHUAN  , CHENG GUANG-MENG  ,   (1)复旦大学物理系; (2)中国科学院上海硅酸盐研究所; (3)中国科学院上海冶金研究所
Published: November 2020

We observed experimentally that at least two optical absorption peaks appear between 3500-6500? after bombardment of LiNbO3 crystal surface by low-energy ion. Also the relative dark conductivity increase by two order of magnitudes, the fact suggests that the additional optical absorption and conductiviting active center creates after ion-bombardment. During bombardment, owing to the prior sputtering of some atom and atom groups in the crystal, a substantial deviation of stoichiometry occur in the surface layer, which has a direct effect upon the optical and electrical properties of LiNbO3 crystal.The measurements of XPS (X photoelectron energy spectroscopy) prove that the structure of this surface layer conforms to the vacancy model of LiNbO3 defect structure. We propose a possible mechanism of the formation of this kind of active center in LiNbO3. By this model, we can explain qualitatively the result obtained from LiNbO3 crystals after bombardement by the mixed ions of Ar+/O+.
CALCULATION OF THE X-RAY INTENSITY FROM PARTICLES BY MONTE CARLO SIMULATION
Authors: HE YAN-CAI  , CAO LI QUN  ,   (1)上海市物资局计算站; (2)中国科学院上海硅酸盐研究所
Published: November 2020

Based on the intersection between Gauss electron beam and the largest cross-sectior of the particles, a method is proposed for calculating the X-ray intensity emitted frond particles. The intensity of the characteristic X-rays from particles of the shape of spheroid, cuboid, elliptic cylinder or elliptic spheroid has been calculated for Al, Cu and Au at 20keV and 25keV. Monte Carlo evaluation of the electron scattering was performed using the model put forward in reference (1).
THE STRUCTURES OF ELECTRODEPOSITED ALLOY OF NICKEL-PHOSPHORUS SYSTEM
Authors: LIN SHU-ZHI  , HEI ZU-KUN  ,   中国科学院金属研究所
Published: November 2020

The structures of electrodeposited alloy of nickelphosphorus system were investigated by means of X-ray diffraction, method. It is shown that the structures of those alloy are a solid solution of phosphorus in nickel while the contents of phosphorus are less than 5.4 at%. When the contents of phosphorus increase up to more than 7.8 at%, the structures of alloys suffer a tremendous change, the diffraction patterns of these alloys may be interpreted by a model of random-layer (turbostratic) structures. The distances between neighbouring layers are 2.04? and the diameter of the layers are 6-8?. The thickness of stacking of layers is decreased as the contentes of phosphorus in alloy are increased. For examples, it changes from 124? for 7.8 at% P to 13? for 18 at% P. The diffraction pattern of the later is just the same as that of the typical amorphous alloys.Using the data of the ratio of intensities of {lll} or the data of the radial distribution function, the rootmean-square of static distortion can be calculated as (u2)1/2=0.17?. This value can be used to interpret why an arbitrary displacement between two neighbouring layers would be possible even though the distance between neighbouring layers is smaller than the diameter of an atom. Because of the small dimension of the layers and the large static distortion of the atom, it is easy to change the orientation of layer domain and no cr-ystallographic boundary region are necessary for the variation of orientation, so that the specimens are the continue distribution of atoms as a whole bat not an aggregation of micro-crystals.The β{lll} corresponding to the breadth of {lll} reflection at half-maximum intensity have been measured for some specimens. The results show that βlll/β222222/cosθlll, where θ is the Bragg angle, this means there would be some other factors (for example, the component fluctuation), to affect the breadth of the reflection line, besides the size factor.
FURTHER REMARKS ON THE SUPERMODULUS EFFECT
Authors: XIONG SHI-JIE  , CAI JIAN-HUA  ,   南京大学固体物理研究所
Published: November 2020

On the basis of the explanation of the supermodulus effect given in a previous paper we discuss further the criterions for the appearance of this effect in compositionally modulated alloys. The results are in accord with all the existing experimental facts.
15N NUCLEAR RESONANCE REACTION AND HYDROGEN PROFILE IN PALLADIUM
Authors: WANG GUANG-HOU  ,   南京大学物理系
Published: November 2020

The 15N+ 1H→12C+4He+4.43MeV(γ-ray) nuclear resonance reaction has been used to study the H concentration versus depth in Pd. It is a precise method because. (1) it has a high depth resolution (～50?); (2) γ-ray can be detected easily after penetrating low temperature and vacuum systems; (3)the isolated resonance has an energy of 6.385 -MeV with very narrow width (6-keV); (4) it has reaction cross section of 0.46 barn and high sensitivity. In this paper, the principle of the method, the experimental set-ups as well as hydrogen distribution in the superconducting Pd (H) prepared at different conditions are discussed. In comparison with the observations on the presure charged sample, some new ideas about the hydrogen behavior in this kind of superconductor are given.
HARMONIC EMISSION GENERATED BY RESONANT ABSORPTION IN LASER-PRODUCED PLASMAS
Authors: YU WEI  , XU ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The harmonic generation by resonant absorption in the laser-produced plasmas is analytically investigated by considering the steepened plasma density gradients in the vicinity of the critical density. The efficiency of the second-harmonic generation obtained is in agreement with experimental results. The calculation has also been extended to estimate the efficiency of the third harmonic generation.
A STUDY OF NITROGEN ISOELECTRONIC TRAPS IN GaAs
Authors: ZHAO XUE-SHU  , LI GUO-HUA  , HAN HE-XIANG  , WANG ZHAO-PING  , TANG RU-MING  , CHE RONG-ZHEN  ,   (1)中国科学院半导体研究所; (2)中国科学院物理研究所
Published: November 2020

The photoluminescences of nitrogen implanted GaAs samples at 77 K have been studied under high pressures. The luminescence peaks of excitons Nx bound to N trap central cell potential and excitons NT bound to deformation potential were observed. The exprimen-tal value of pressure coefficient of Nx level is 2.8 meV/kbar. Under the atmospheric pressure, the N resonant state is at 179 meV above the conduction band edge. The pressure behaviors of electron-phonon coupling strength of N isoelectronic trap and effective radius of bound exciton are discussed.
OPTICAL OBSERVATION OF THE IONIC TRANSPORTATION AND ITS RELAXATION IN α-LiIO3 UNDER THE DC ELECTRIC FIELD ALONG c-AXIS
Authors: ZHANG GUANG-YIN  , LIU JIAN  , FENG SHANG-TING  ,   南开大学物理系
Published: November 2020

Having observed directly the fibre channels in which the ions transport and their relaxation with a polarizing microscope, we have provided a strong evidence for the model of the channel conductance in the c-direction. At the same time, we observed that a rotation of π/2 in the polarization of transmission light only takes place near the channels for α-LiIO3. It is sure that the grating which produces light diffraction beam subtending large angles and turning its polarization to π/2 consists of the many channels.
FIELD THEORY OF THE DISPLACIVE INCOMMENSURATE PHASE
Authors: GUO RU  , YANG ZHEN-QING  ,   南开大学物理系
Published: November 2020

In this letter, we derive a multi-harmonic modulation solution of the incommensurate phase of a sinple model by a method like that used to solve pendulum problem in mechanics. This solution reduces to single-harmonic modulatioi at the of high temperature limit and transforms into kink solution at the of low temperature limit. The basic wave-vector decreases monotonously with temperature as observed in experiment.
THE BEHAVIOR OF DEEP LEVEL WAVEFUNCTIONS IN SHALLOW ENERGY REGION
Authors: LI MING-FU  , REN SHANG-YUAN  , MAO DE-QIANG  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学研究生院
Published: November 2020

The behavior of deep level wavefunctions induced by short range defect potential is investigated when the energy difference ε between the defect state and the band edge is very small. When ε→0, the wavefunctions tend to expand in real space and concentrate in k space when some symmetric matching condition is satisfied. A specific scheme is developed for efficient and reliable numerical calculations of the deep level wavefunctions when ε is very small. For the case of A1 symmetric defect states near the bottom of the conduction band, for Si, when ε1 defect states near the top of the valance band, no concentration in k space occur since the A1 defect states mismatch to the Block states at valance band maxima.
ANOTHER APPROACH OF TREATING KINETIC PROBLEM OF PLASMA
Authors: ZHANG CHENG-FU  ,   北京大学物理系
Published: November 2020

The traditional approach of treating kinetic problem of plasma is solving kinetic equation for f (v, r,t), then calculating the wanted macroscopic quantities by integration. It is shown that this is not a convenient and direct way. If transforming f (v, r, t) in to the Fourier space K, with respect to v, getting f(K, r, t) and corresponding equation of it, then only the value of f (K, r, f) near K≈0 is need for practical interest Two examples, one is the derivation of dispersion equations of electro-magnetic modes in a inhomogenius low β plasma, the other is the effect of collision on the temperal echo, show the main procedures of this approach and its advantage over the traditional one.
ON A SET OF COUPLED EQUATIONS FOR THE ORDER PARAMETER -STATISTICAL GREEN'S FUNCTIONS
Authors: SU ZHAO-BIN  , YU LU  , ZHOU GUANG-ZHAO  ,   中国科学院理论物理研究所
Published: November 2020

A set of coupled equations for a quantum statistical system that determine self-consis-tently the order parameter, the energy spectrum, the dissipation and the distribution for both fermion field and collective excitation is suggested with a loop expansion formalism. They are applicable to non-equilibrium as well as equilibrium systems.
FITTING THE ATOMIC SCATTERING FACTORS FOR ELECTRONS TO AN ANALYTICAL FORMULA
Authors: JIANG JIAN-SHENG  , LI FANG-HUA  ,   (1)中国科学技术大学; (2)中国科学院物理研究所
Published: November 2020

The data of electron scattering factor for all neutral atoms, given in International Tables for X-Ray Crystallography in the range of sinθ/λ from 0.0 to 2.0 have been fitted by use of the damping least square method to an analytical formula with nine parameters as f(s)=sumfrom i=1to4 (aie-bis))+c. A relative deviation factor R=sumfrom k=1toN (|fok-fok|)/sumfrom k=1toN (fok) is served as the criterion of the relative deviation between the calculated and the observed values of the atomic scattering factor. The calculation shows that the relative deviation factors R for all atomic factors are approximately equal to 10-3. All parameters and corresponding relative deviation factors are tabulated. The maximun errors, the mean error, the mean square error and the summation square deviation are also given.
YOUNG TABLEAUX FORMS OF FN CONFIGURATION WAVE FUNCTION
Authors: ZHANG SI-YUAN  ,   中国科学院长春应用化学研究所
Published: November 2020

By using the Young tableaux, a systematic method of expressing the wave function of fN configuration spectral term, in particular, the wave function of degenerate spectral term, are given. The wave functions obtained are in accordance with the Racah group chain.
THE SATURATION EFFECT OF DEGENERATE FOUR-WAVE MIXING IN DOPPLER-BROADENED SYSTEM
Authors: FU PAN-MING  ,   中国科学院物理研究所
Published: November 2020

We have studied the saturation effect of degenerate four-wave mixing in Doppler-broadened two-level system. A set of recurrent formula which is suitable for numerical analysis is derived and applied to calculate the lineshape of four-wave mixing signal in the weak saturation region. The results show that a double-peak structure appears at the line center as the intensity of the incident light increases.
STATIONARY PULSE SOLUTIONS FOR A FREE ELECTRON LASER
Authors: FANG HONG-LIE  , FU SHU-FEN  , G. T. MOORE  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The stationary pulse solutions for a free electron laser are obtained by using the classical theory. Computation shows that the stationary solutions can only be found under certain particular conditions. The shapes of the solutions do not depend on the shapes of initial optical pulses as long as these conditions are satisfied.
STUDY ON THE FREQUECY DEPENDENCE OF THE CONDUCTIVITY OF AMORPHOUS B2O3-0.7Li2O-0.7LiCl
Authors: YANG YUAN  , YANG PEI-FANG  , YU WEI-HAI  ,   中国科学技术大学物理系
Published: November 2020

The relationship of the conductivity with frequency for an amorphous fast lithium ion conducting material B2O3-0.7Li2O-0.7LiCl was studied. The results showed that: in a quite wide frequency range the bulk conductance was equal to the total conductance for the specimens; the frequency spectra of the conductivity showed a plateau and a rise in the intermediate and higher frequency range, respectively; and the frequency at which the conductivity began to increase became higher with rising of temperature. As a result of the features of such amorphous material, the measurement of the conductivity may be carried out by use of the a.c. bridge or the a.c. V-A method and thus be simplified. Considering the effect of the long range disorder in the non-crystalline solid on the ionic transport, we praposed a mechanism of the local polarization and explained the features of the spectra of conductivity and its dependence on temperature.
ANELASTIC INTERACTION BETWEEN MOVING KINK AND MOBILE PAIRS OF POINT DEFECTS
Authors: SUN ZONG-QI  ,   中国科学院金属研究所
Published: November 2020

The micro-diffusion equation for Zener pairs and asymmetric pairs of point defects in fcc metals under the action of periodic distributional moving sources of inner stress have been solved by using finite Fourier transformation and Laplace transformation. Finite sum formulae for rigidity and damping coefficient of a kink have been obtained.Numerical results are given. A simple analytic result is obtained for anelastic interaction between edge dislocation and asymmetric pairs of point defects, which is found to be in agreement with other results based on a different approach.The enhanced internal friction due to the interaction between dislocation and point defects is discussed.
A SEARCH FOR π-N INTERACTION BY QUARK MODEL
Authors: HE QI-ZHI  , YANG JIAN-HUA  , CHENG GUO-JUN  , YANG RONG-FU  ,   (1)大连轻工业学院; (2)喀什师范学院; (3)四川大学
Published: November 2020

By means of quark potential model and Warke approximation, and introducing as compensation intermediate potential (-1)T+JKre(-r/a2) in the phenomenological one gluon exchange quark interaction potential, the pion-nucleon interaction potential is calculated. The phase shifts of p-N scattering in the six channels S11, S31, P11, P31, P13, P33 are determined for the incident pion kinetic energy in the laboratory coordinate system up to 700 MeV. These results are compared with the experimentally determined phase shifts.
THE RESPONSE OF A TRI-LEVEL ATOMIC SYSTEM TO LASER PULSES AND TWO-PHOTON TRI-LEVEL ECHO
Authors: CHEN TIAN-JIE  , S. R. HARTMANN  ,   (1)Radiation Lab,Columbia University New York City,U. S. A.; (2)北京大学物理系
Published: November 2020

The response of an atomic tri-level system to laser pulses was analyzed and the condition for forming tri-level echo was obtained. This new echo has been observed experimentally and used to measure the collisional cross-section between │32D〉+│32P3/2>〉 Na and Ar.
THE EFFECT OF THE COULOMB INTERACTION ON LOCALISED STATES IN CONJUGATED POLYMERS
Authors: PENG JING-CUI  ,   湖南大学物理系
Published: November 2020

The effect of the coulomb interaction on electrically neutral, localised states of conjugated polymers is investigated using a tight binding Hamiltonian. For trans- (CH)x, we calculated the excitonic spectrum, recalculated the absorption coefficient, and corrected the edge of the absorption profile. The results are shown to be in good agreement with experiments.
THE ELASTIC CONSTANTS CijE, AND CijD, OF LiNbO3 DETERMINED BY THE ULTRASONIC "PULSE ECHO OVERLAP METHOD"
Authors: WANG RU-JU  , WANG JI-FANG  , CHA JI-XUAN  ,   (1)中国科学院声学研究所; (2)中国科学院物理研究所
Published: November 2020

Based on the fundamental piezoelectric Christoffel's equation, we derived the expression of the elastic constants for piezoelectric crystal with trigonal symmetry point group 3 m. The ultrasonic wave velocities in LiNbO3 crystal, propagating along different crystallographic directions, are determined by the "pulse echo overlap method". The. carrier frequency of rf pulse is 10 MHz. The Values of the secondorder elastic constants CijE and CijD for LiNbO3 crystal are obtained as follow: C11E = 19.89, C12E = 5.25, C13E = 7.81, C14E = 0.96, C33E = 25.44, C44E = 6.10, C66E=7.32×1010N/m2·C11D = 21.51, C12D= 3.65, C13D = 7.91, C14D=-1.41, C33D = 26.10,C44D = 9.62, C66D = 8.93×1010N/m2.
SPONTANEOUS MAGNETIC MOMENTS AND CURIE TEMPERATURES OF Au-Ni WEEKLY FERROMAGNETIC ALLOYS
Authors: YU MEI  , LIU ZUN-XIAO  , H. L. LUO  ,   (1)Department of Electrical Engineering and Computer Siences,University of California,San Diego,USA; (2)北京大学物理系
Published: November 2020

The low-temperature magnetizations of liquid-quenched Au-Ni alloys containing 42 to 55 at% Ni have been measured in an uniform magnetic field (2 to 70kOe) using a motor-driven vibrating sample magnetometer. The spontaneous magnetic moments at 1.5 K were obtained. And the Curie temperatures were determined from Arrott-Noa-kes plots. The measured magnetic moments are first compared with the average moments calculated from Perrier nearestneighbor model. Furthermore, we not only consider the Ni nearest neighbors but also the Ni second-nearest neighbors. The simple model of an environment-dependent moment is presented. It is assumed that one Ni atom has a moment μNi=0.606 μs if surrounded by at least 11 Ni atoms as nearest and second-nearest neighbors (the numbers of the nearest and the second-nearest neighbor are 18 for fee structure), and no moment if not. The calculated values from this model fit the measured values well. The existence of spin clusters and their interactions are discussed. The averagevalues of the internal field μBH/kB, which present the ferromagnetic interaction betweenspin clusters, are estimated.
A METHOD OF DETERMINATION OF CRYSTALLITE SIZE FROM LINE PROFILES FITTED BY THE WEIGHTED GAUSS-CAUCHY COMBINATION FUNCTIONS
Authors: LIU YUN-JI  , GUO CHANG-LIN  ,   中国科学院上海硅酸盐研究所
Published: November 2020

In this paper, a new method for determining the crystallite size from line profile analysis is presented. The diffraction line profiles are fitted by weighted Gauss-Cau-chy combination functions. By using Fourier transform method, the integral width of pure physical brodening function f(x) can be obtained directly without assumption about the profile f(x). The method is more accurate, simple and convenient than the usually used methods of approximate functions, and the artificial and arbitrary nature of the assumption about function f(x) are avoided.
DECOUPLED DIRAC EQUATIONS IN KERR-NEWMAN-DE SITTER SPACE-TIME
Authors: SHEN YOU-GEN  ,   中国人民建设银行上海市分行
Published: November 2020

In this work, we solved the decoupling problem of the Dirac equation with non-zero rest mass in a Kerr-Newman-De Sitter background. The physical solutions of the Dirac equation with non-zero rest mass are found outside the event horizon of Kerr-Newman-De Sitter space-time by a proper transformation. The Hawking thermal spectra formula is also dirived. The problem of the Hawking evaporation of Dirac particles in Kerr-Newman-De Sitter black hole background is thus solved.
INFLUENCE OF CUBIC MAGNETOCRYSTALLINE ANISO-TROPY ON THE STABILITY OF STRIPE DOMAIN AND BUBBLES SUBJECTED TO AN IN-PLANE FIELD
Authors: HAN BAO-SHAN  , LI BO-ZANG  , NIE XIANG-FU  , TANG GUI-DE  ,   (1)河北师范大学物理系; (2)中国科学院物理研究所
Published: November 2020

The erasing process of stripe domains in eight (111)-oriented garnet bubble films was observed in the presence of an in-plane field. The stripe domain erasing field H*s and the domain erasing field H*k were measured as functions of the azimuthal angle βof the in-plane field. Taking the cubic magnetocrystalline anisotropy into account, a theory of stability of stripe domains subjected to an in-plane field was developed. The main features of the experimental results can be expained qualitatively by this theory. Two theoretical relationships between Hs* and βas well as K1 were found. They are applicable to the cases that the direction of in-plane field is near and not fairly near the 〈110〉 crystallographic axes respectively, and are found to be roughly consistent with the experimental results. In particular, along the 〈110〉axes an analytical expression was obtained:Hk〈110〉* =Hs〈110〉*=Hk{1+ K1/2ku-[al/h(4pMs/Hk)2]2/3},which is in good agreement with the experiments.
OPTICAL SWITCHING AND BIST ABILITY IN A FABRY-PEROT INTERFEROMETER CONTAINING PLASMA
Authors: ZHONG QUAN-DE  ,   中国科学院物理研究所
Published: November 2020

In this paper, the optical switching and bistability of a Fabry-Perot interferometer filled with plasma are studied theoretically. In the plane-wave approximation a equilibrium state equation which shows nonlinear transmission-intensity characteristic is derived. The critical detuning and the general formulae of "on " and "off" intensities for bistable operation are presented. A numerical example is given.
ON ELECTRON OPTICAL TRANSFER FUNCTION AND IMPULSE RESPONSE IN THE PRESENCE OF SPHERICAL ABERRATION AND DEFOCUS
Authors: XIMEN JI-YE  , YAN JI-WEN  , HUANG XU  ,   北京大学无线电电子学系
Published: November 2020

It is well known from electron optics that spherical aberration and defocus modify the diffraction plane wave function by a phase shifty and the coherent amplitude and phase-contrast transfer functions are cosy and siny. Consequently, the inverse Fourier transforms of cosy and siny are the real and imaginary parts of impulse response. The locations of the zeros and extrema of the amplitude- and phase-contrast transfer functions are presented. These zeros and extrema devide the diffraction plane into a series of annular regions. When the value of the dimensionless defocus is selected as △=N1/2 (N is a positive integer), the integrals of transfer function over corresponding annular regions are equal. Equivalently, their contributions to the central value of the impulse response are of the same value. The conditions for maximizing or minimizing the integrals of cosy on siny (i.e. maximizing or minimizing the central value or intensity of impulse response) has been suggested. In the present paper, the condition for the mean-square optimum approximation of impulse response with the ideal Airy distribution has also been discussed.
RELATIONSHIP BETWEEN FORMAL QUANTUM-OPERATOR METHODS AND MATRIX METHODS IN OPTICS
Authors: SUN FENG-JIU  ,   东北工学院物理系
Published: November 2020

This paper discusses the relationship between operator methods and matrix methods in optics. Based on the definition of optical variable operators and the hypothesis that optical operators of linear optical systems are unitary, the relation equation dealing with the relationship between operator methods and matrix methods in optics has been obtained from the general property of linear systems. For a given optical system, its optical operator can be derived from its optical matrix by solving the relation equation. And if the optical operator of a system is given, its optical matrix can also be derived from that equation. Thus the equivalency between operator methods and matrix methods in optics is demonstrated. Finally, the physical significance of the optical operator h has been pointed out.
FLUORESENCE SPECTRUM AND TWO-PHOTON PROCESSES OF A THREE-LEVEL ATOM INTERACTING WITH TWO MONOCHROMATIC LASER
Authors: PENG JIN-SHENG  ,   华中师范学院物理系
Published: November 2020

A three-level atom interacting with a strong and a weak monochromatic laser is investigated by means of the dress unitary transformation technique. The two-photon process characteritics is analysed and the fluorescence spectrum of atom is presented, it is shown that they depend on both the intensity of driving field and the detuning.
COMMENTS ON THE FLUCTUATION MODEL OF PAS-SIVELY MODE-LOCKED LASERS
Authors: ZHU ZHEN-HE  ,   中国科学院物理研究所
Published: November 2020

We investigate how the pulse number of the set of fluctuations effects the mode-locking. The effects of the length of laser cavity on the mode-locking "window" and mode-locking threshold are als studies for Nd-glass and Nd: YAG lasers.
ELECTRONIC STRUCTURE OF THE DIVACANCY IN SEMICONDUCTORS (Ⅰ)——BASIC EQUATIONS
Authors: REN SHANG-YUAN  , MAO DE-QIANG  , LI MING-FU  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学研究生院
Published: November 2020

A complete set of equations for determining the energy levels and the wavefunc-tions with different symmetry of electronic states of the ideal divacancy in cubic semiconductors is obtained using the Koster-Slater Green's function method. Using an empirical tight binding Hamiltonian for the band structure of the host and the on-site pertubation approximation for the defect, only the on-site and the off-site Green's functions of the host and their derivatives with respect to energy E are involved in these equations.
A STUDY ON PHASE RELATIONS OF RAPIDLY QUENCHED ALLOYS IN Ag-Ge SYSTEMS
Authors: CHE GUANG-CAN  , LIANG JING-KUI  , JIN ZUO-WEN  , ZHAO ZHONG-XIAN  ,   中国科学院物理研究所
Published: November 2020

The phase relations and thermodynamic stabillity of metastable phases in rapidly quenched Ag-Ge alloys have been studied by means of DTA, DSC and X-ray powder diffraction techniques. Solubillity of Ge in Ag is extended from 1.5 at% Ge to 8 at% Ge, when cooling speed of alloy is approximately 104 K/s. Except supersaturated solid solution of Ge in Ag and Ge, there also exists a metastable phase, which has the hexagonal close-packed structure (hep) with lattice parameters a=2.893±0.010 ?, c=4.720±0.010 ?, c/a=1.632. For 20 at% Ge alloy, the activation energy of hep phase transition and supersaturated solution desolvation are 93 kJ/mol and 102 kJ/mol respectively. The nature and transition mechanism of the metastable phases are discussed.
HARTREE-FOCK-ROOTHAAN WAVEFUNCTIONS FOR DIATOMIC MOLECULES IN A SAME BASIS SET (Ⅱ)——H2 AND FIRST-ROW HOMONUCLEAR SYSTEMS A2, A2~±AND A2
Authors: WU JI-AN  ,   中国科学院半导体研究所
Published: November 2020

Ab initio calculations of electronic wavefunctions, orbital energies and total energies for H2 and first-row homonuclear diatomic systems have been performed with the same double zeta CGTF basis set which has been used in the previous paper. The repertory of states includes the ground states A2, a few lowlying excited states A2~*, and positive and negative ions A2~± where A denotes the elements Li through F. The calculations are restricted to states involving either closed-shell electron configurations or open-shell configurations with one incompletely filled open shell. Tables of electronic wavefunctions of H, and some ground states A2, as examples, are presented.
GROWTH AND OPTICAL PROPERTIES OF K5Bi(MoO4)4-Nd3+ SINGLE CRYSTALS
Authors: TANG LIAN-AN  , LIU JIAN-CHENG  , CHEN JIA-PING  , WANG WEN  , LE XIU-HONG  ,   中国科学院上海硅酸盐研究所
Published: November 2020

Single crystals of K5Bi0.9Nd0.1 (MoO4)4 and K5Bi0.97Nd0.03(MoO4)4 were grown from sto-ichiometric melts by the usual Czochralski technique. The crystal (Nd = 0.1) belongs to trigonal system, with space group R3m, Z = 1.5, and cell parameters a = 6.023 ?, c=20.887?.The room temperature absorption spectra of K,Bi(MoO4)4-Nd3+(3 % or 10 % Nd3+) consist of several bands characteristic of the rare earth Nd ions in crystals. The substitution of Nd3+ by Bi3+ does not affect the surrounding of the active ions. Details of room temperature emission spectra corresponding to the 4F3/2→4I13/2 and 4F3/2→4I11/2 transitions are also given.
THERMAL NEUTRON INELASTIC SCATTERING SPECTRA OF LaNi4.5Mn0.5Hx
Authors: CAO MING-ZHONG  , WANG FU-TUAN  , WANG GEN-SHI  , SONG DE-YING  , CHEN GUI-YING  , RUAN JING-HUI  ,   (1)南开大学; (2)中国科学院原子能研究所
Published: November 2020

Inelastic neutron scattering spectra of LaNi4.5Mn0.5Hx (x=1.2, 4.2, 5.6) have been measured using berylium filter detector spectrometer. From the spectras, it was found that the second and the third peak of optical branches shifted 6 meV and 10 meV towarcs high frequency respectively, and the M-H bond in LaNi4.5Mn0.5Hx became stronger than that in LaNi5Hx, after the same part Ni of LaNi5 was replaced by Mn. Finally, we explained the cause of this phenomena in brief.
STUDY OF STIMULATED PHOTON ECHO IN DEGENERATE TWO-LEVEL SYSTEM GENERAL THEARY AND RELAXATION INDUCED STIMULATED PHOTON ECHO
Authors: YE PEI-XIAN  , FU PAN-MING  ,   中国科学院物理研究所
Published: November 2020

The stimulated photon echo in degenerate two-level system has been studied. The stimulated photon echo signal for different polarization arrangement of incident lights was obtained basing on the third-order perturbation theory, where, the density matrix was expanded in an irreducible spherical-tensor operator. The characteristics of stimulated photon echo were discussed. Taking ja = jb = 1/2 system as example, we have also studied the relaxation induced stimulated photon echo, where, the polarization arrangement of the three incident pulses is σ+→σ+→σ-.
MONTE CARLO SIMULATIONS OF SU(2) LATTICE GAUGE THEORY WITH THE NEW ACTIONS BY USING THE DISCRETE SUBGROUP
Authors: LI WEN-ZHU  , ZHANG JIAN-BO  , DONG SHAO-JING  ,   浙江大学物理系
Published: November 2020

Monte Carlo simulations of the SU(2) lattice gauge theory with SIN action and EXP action are performed by using the icosahetral subgroup. We obtain that the first order phase transition points due to the nature of discrete subgroup are βc′≈9.2±0.2 and βc′= 6.8±0.2 respectively. The plaquette energy and specific heat of present case are in good agreement with that of the SU(2) group. Therefor, we verify that for two kinds of actions mentioned above, using discrete subgroup instead of SU(2) group is reasonable and provides the foundation for further calculations by means of the icosahetral subgroup.
THE SCHWINGER-DYSON EQUATIONS OF THE WILSON LOOP VARIABLE IN THE LATXTICE GAUGEX FIELD THEORY AND THE PROBLEM OF UNIVERSALITY
Authors: HE XIANG-HAO  , XIAN DING-CHANG  ,   中国科学院高能物理研究所
Published: November 2020

Some categories of generalized Wilson actions are introduced and the Schwinger-Dyson equations corresponding to these actions are derived. It is shown that these equations have the same form as those in the continuum limit, thus showing that these generalized Wilson actions are equivalent.
ELECTRONIC STOPPING POWER OF B+ IMPLANTATION IN GaAs
Authors: CHENG ZHAO-NIAN  , WANG WEI-YUAN  ,   中国科学院上海冶金研究所
Published: November 2020

Based on published experimental data of Rp, a proposed relative correction method combining with numerical solution program of LSS equation was used to calculate the electronic stopping power of B+ implantation in GaAs, as follows NSe(E) = 12.4E0.605,Using this expression, the range statistic parameters Rp,△Rp and R⊥for B+ implanted GaAs were calculated.