bluuebunny/crossref_metadata_2025 huggingface dataset:
AN ALTERNATE PROOF OF THE INFINITE ORDER PERTURBATION THEORY BY MATRIX PARTITION
Authors: ZHENG ZHAO-BO  ,   中国科学技术大学物理系
Published: November 2020

Recently, Wu and his coworkers formulated an infinite order perturbation theory for solving the Green's function of a disordered system, using a diagrammatic technique. In this paper, the method of matrix partition is used to obtain the same series of recursion relations, thus providing an algebraic proof for the theory.
A THEORY OF COHERENT PROPAGATION OF LIGHT IN SEMICONDUCTORS (Ⅰ)
Authors: GAN ZI-ZHAO  , YANG GUO-ZHEN  ,   (1)北京大学物理系; (2)中国科学院物理研究所
Published: November 2020

This paper is the first part of a theory of the coherent propagation of light in semiconductors. When the interaction between electrons is neglected we obtain the Bloch equation describing the matrix elements of interband transitions induced by coherent light in semiconductors. The interband transitions in the system are analogous in form to those of an inhomogeneously broadened two-level system, but a particular type of multiphoton process will occur under the action of intense light.
NEUTRON DIFFRACTION STUDY OF THE ORDER-DISORDER TRANSITION OF AN Fe-Si-Al ALLOY
Authors: QIAN XIANG-RONG  ,   上海钢铁研究所
Published: November 2020

The degrees of LEO (Long Range Order) and magnetic moments of the Fe atoms in a Fe-Si-Al alloy have been determined by neutron diffraction. The results indicate that after heat-treatments with different cooling rates, the alloy gains different degrees of LRO, which may be regarded as the main cause giving rise to significant, differences in the magnetic permeability.
ON THE APPLICATION OF HEAVY ATOM INFORMATION IN DIRECT METHODS——PHASE ESTIMATION OF THE STRUCTURE FACTORS IN CRYSTALS CONTAINING HEAVY ATOMS
Authors: FAN HAI-FU  , HAN FU-SEN  , HE CUN-HANG  ,   (1)中国科学院物理研究所; (2)中国医学科学院
Published: November 2020

Information drawn from the heavy atom plays an important role in the determination of crystal structures containing heavy atoms. To what extent would the determination proceed successfully depends on how the heavy atom information should be used. In this paper a new procedure is proposed to make full use of the heavy atom information and make the combination between heavy atom method and direct method more efficient.
FURTHER INVESTIGATIONS ON THE ABNORMAL SCATTERING OF LIGHT IN AN α-LiIO3 SINGLE CRYSTAL UNDER THE ACTION OF A DC FIELD
Authors: YANG HUA-GUANG  , LI CHEN-XI  , XU ZHENG-YI  ,   中国科学院物理研究所
Published: November 2020

It is found in Eef. [1] that a band of scattered light is produced when a laser beam passes through an α-LiIO3 single crystal under the action of a DC field along the c-axis. The electric vector of the scattered light has special direction which differs from that of the incident beam. In this paper, we have further investigated the characters of this scattering of light. The fine structure of the band has been studied. No frequency shift between the scattered and incident beam larger than 15 MHz has been. observed. The distribution of intensity of the band is asymmetric with respect to the transmitted light spot, one side is stronger than another. We have found that the distributions of intensity of the scattering band are inverse for the two types of absolute configuration of α-LiIO3 single crystals, that is the stronger side of the band for the D type crystal corresponds to the weaker side for the L type crystal. We have also studied the relationship between locations of bands and that of the transmitted light spots, and found it is dependent on the orientations, of the incident and exit surfaces of specimens with respect to the c-axis of the crystal.
PARAMETRIC EXCITATION EFFECTS ON THE ELECTRON CYCLOTRON HEATING IN HIGH FIELD TOKAMAK
Authors: ZHOU YU-MEI  , CAI SHI-DONG  ,   中国科学院物理研究所
Published: November 2020

Several possible parametric decay channels are studied in high field and dense Tokamay range. It is found that for the high power nearly perpendicular incident, electron cyclotron wave parametric processes may occur before it encounters the linear mode-conversion-layer. The pump wave decays into an ion Bernstein wave or a lower hybrid wave is most probable.
A NEW THEOREM DEDUCED FROM THE COMPLETION OF HANUSSE'S THEOREM
Authors: ZHAN KEN-HUA  , XIE DAI-LAI  , WANG PEI-ZHUANG  ,   (1)北京师范大学; (2)西北大学
Published: November 2020

A new theorem have been deduced from the completion of Hannsse's theorem. It states: "If reactants in the intermediate reaction are not more than two kinds and the numbers of molecule taking part in any one reaction are not more than two, then it is not possible that a steady state arrives at a limit cycle".
COHERENT POTENTIAL APPROXIMATIONS FOR n-COMPONENT LIQUID ALLOYS
Authors: SHEN YU-TANG  , ZHANG ZHAO-QING  ,   中国科学院物理研究所
Published: November 2020

Coherent Potential Approximation (CPA) for a n-component liquid alloy is derived by taking the limit of a generalized lattice-gas model, criminally formulated by Yonezawa and Watabe. We have taken the transfer integral tAB between atoms A and B as the geometrical mean of tAA and tBB. In the absence of short range order, our results are consistent with that obtained by Shiba using a coherent locator method.
RESISTIVITY DUE TO SPIN-WAVE SCATTERING IN FERROMAGNETIC METALS
Authors: LEI XIAO-LIN  ,   中国科学院上海冶金研究所
Published: November 2020

We have discussed the effect of the split of the energy levels between spin-up and spin-down electrons caused by magnetization on the magnon-induced resistivity in ferromagnetic metals at low temperatures. As a result of such an energy split, the low-temperature magnetic resistivity always declines exponentially with decreasing temperature in the single-hand model, while it may probably be enhanced in certain conditions in the two-band model. The comparison between the low-temperature expression of magnetic resistivity deduced from the single-band model considering the energy-gap in the spin-wave spectrum and the experimental data of Tb and Dy shows agreement not only on temperature dependence of resistivity at low temperatures but on the magnitude of high-temperature magnetic resistivity as well.
FOURIER ANALYSIS OF RAINBOW HOLOGRAPHIC IMAGING
Authors: CAI LU-ZHONG  , ZHANG YOU-WEN  ,   (1)山东大学; (2)上海交通大学
Published: November 2020

Based on the viewpoint of Fourier optics, we have analysed systematically the (monochromatic) point spread function and transfer function of rainbow holographic imaging limited by an arbitrary aperture, revealed the essential relation between the function and the aperture, then established a unified theory which is analogous to that of conventional imaging system. Thus we provided a simple and clear mathematical basis for calculation of the limited resolution and the cut-off frequency.
THE CORRESPONDANCE BETWEEN GROWTH STRIATIONS AND STRUCTURES OF FERROELECTRIC DOMAINS IN CZOCHRALSKI-GROWN LiNbO3 SINGLE CRYSTALS
Authors: MING NAI-BEN  , HONG JING-FEN  , FENG DUAN  ,   南京大学物理系和固体物理研究所
Published: November 2020

The variations of ferroelectric domain structures related to rotational striations and power striations are observed. The one-to-one correspondance between rotational striations and structures of ferroelectric domains have been demonstrated. The distribution of solute concentration in rotational striation is measured by means of energy dispersive analysis of X-ray in scanning electron-microscope, and we reached the conclusion that the ferroelectric domain structures are dependent on the gradient of solute concentration. The coupling of the spontaneous polarization with the gradient of solute concentration is experimentally demonstrated for the first time.
THE ELECTRICAL PROPERTIES OF KLiSO4 SINGLE CRYSTALS
Authors: ZHU YONG  , ZHANG DAO-FAN  , XU ZHENG-YI  ,   中国科学院物理研究所
Published: November 2020

In this paper, we have verified that the KLiSO4 single crystal is a Li ionic conductor. It was determined that carriers in KLiSO4 single crystal are interstitial Li ions and Li vacancies by measuring the voltage distribution in the specimen. After turning off the applied dc voltage, the decrease of current follows a negative power law of time in a certain time domain. Correspondingly, the dielectric dispersion which has a negative power relationship with frequency has also been found in a certain frequency domain. The background current, the dc electric conductivity and the apparent dielectric constant of KLiSO4 single crystal exhibit sharp peaks besides jump nearby the transition temperature. These peaks were observed only when the rate of temperature change is low, thus it is shown that the phase transition includes a relaxation process.
TWO DIMENSIONAL DYNAMICAL NMR SPECTRUM IN WEAK COUPLED TWO SPIN (I=l/2) SYSTEM
Authors: HUANG YONG-REN  ,   华东师范大学物理系
Published: November 2020

In general, two dimensional dynamic NMR spectrum can be obtained by means of three-pulses experiment. But the informations from this experiment may sometimes be obscured if the scalar coupling in the nuclear system appears. In this work, a theoretical 2D dynamic NMR spectrum of weak coupled two spin system is calculated in Liouvelle space. The analytic solutions of density matrix in AX(I=1/2) system is given. It is shown that (1) after applying of gradient pulse, a z-component, a zero-quantum coherence and a double-quantum coherence will be left in the density matrix; (2) the effects of scalar coupling is different from those of exchange and relaxation and the former only contributes to the zero-quantum coherence and double-quantum coherence. Therefore, one can expect that the interference from the scalar coupling would be eliminated in some appropriate experiment.
MONTE CARLO CALCULATION ON THE MEASUREMENT OF THICKNESS OF THIN FILMS IN MICRO-DOMAIN
Authors: HE YAN-CAI  , HUANG YUE-HONG  , SUN JING  , CHEN YU-SAN  ,   (1)中国科学院上海硅酸盐研究所; (2)中国科学院上海冶金研究所
Published: November 2020

Monte Carlo method has been used to evaluate the X-ray intensity distribution funetion in freestanding thin films and in surface layer of same thickness of the same material. A simple equation of the X-ray emitting intensity from a thin film on substrate has been proposed to correct the influence of Z. A. P. on the determination of film thickness. The accuracy of the present measurement is higher than that of methods previously. developed. Experimental results are presented for Ta2O5 film on GaAs and for ZrO2 on Si. They are in agreement with those obtained by ellipsometry.
THE MEASUREMENT OF THE TRUE SURFACE TEMPERATURE VIA THE BRIGHTNESS METHOD
Authors: ZHANG CAI-GEN  ,   中国科学院上海技术物理研究所
Published: November 2020

In this paper, we present the method and the experimental results of direct measuring of the true surface temperature for a body in the environment using the IR thermometer.The calculation of the equivalent blackbody temperature TB of the environmental radiation and the emissivity ε of the target on the basis of the temperature data of the IR thermometer is discussed.
PHASE DIAGRAM OF THE ALLOYS OF THE GADOLINIUM-INDIUM BINARY SYSTEM
Authors: ZHUANG YING-HONG  , YUAN SHI-TIAN  , ZHENG JIAN-XUAN  ,   广西大学物理系
Published: November 2020

A phase diagram of the alloys of the gadolinium-indium binary system was studied by differential thermal analysis, X-ray diffraction method and microscopic observation. The following six intermediate phases were verified: Gd3In,Gd2In,Gd5In3,Gdln,Gd2In3 and Gdln3. There are five eutectic transformations corresponding respectively to about 12 at % In (eutectic temperature 988℃), 30.5 at % In (1151℃), 38.5 at % In (1114℃), 64.5 at % In (1010℃). The eutectic on the In-rich side is degenerate. The decomposing temperature of the compound Gd2In3 formed by peritectie reaction is Tper= 1107℃. The periteetoid reaction 2Gd2+GdIn←→Gd5In3 occurs at 1071℃. Neither In in Gd nor Gd in In shows any detectable solid solubility.
ANALYTICAL THEORY OF ION-TEMPERATURE-GRADIENT INSTABILITY
Authors: GUO SHI-CHONG  , SHEN JIE-WU  , CHEN LIU  , CAI SHI-DONG  ,   (1)美国普林斯敦大学等离子体物理实验室; (2)中国科学院物理研究所
Published: November 2020

The relations between the threshold values of ion-temperature-gradient instabilities and the temperature parameter of plasmas are investigated analytically in the slab and toroidal geometries separately. It is found that the threshold values increase rapidly when the ion temperature becomes much higher than the electron temperature. The change of the threshold values with respect to the ion temperature is quite similar for both geometric models. Our results are consistent with the PLT observations and also agree well to that of the numerical calculations.
THE TWO-DIMENSIONAL NONLINEAR EFFECTS OF PONDEROMOTIVE FORCE OF LOWER HYBRID WAVE
Authors: LI DA-FENG  , MA ZHONG-FANG  , CHEN JI  ,   中国科学院等离子体物理研究所
Published: November 2020

We discussed the nonlinear effects of ponderomotive force, which is exerted by powerful LH waves with large electrical fields (|E|～1.5 kV/cm). An obvious nonlinear nonhomogeneity of density in the direction parallel to B0 has been found. It might be serious enough to influence the propagation of the long waves (such as waves with N‖～1). As for the direction perpendicular to B0,if there is reflection inside the plasma (for example, from the region close to the limiter of Tokamak), a series of density cavities might appear along the path of LH wave transmission, and the picture of plasma displacement is no longer suitable.
AN ELECTRON MICROSCOPIC STUDY ON AMORPHOUS Tb-Fe THIN FILMS
Authors: YANG CUI-YING  , ZHOU YU-QING  , ZHAO JIAN-GAO  ,   中国科学院物理研究所
Published: November 2020

Using electron microscopy and electron diffration methods, we have investigated the microstructures, shortrange order and their changes with increasing temperature in amorphous Tb31Fe69 and Tb27Fe73 films prepared by vapour deposition in a vacuum of 10-5 torr. The process of crystallization have also been observed and analysed. The microstructures of samples with different oxygen contamination and different annealing temperatures were found to be different. However, the phase separation of both samples seemed to occure by a mechanism similar to spinodal decomposition, by which an initial amorphous phase first decomposed into two or more compsitionally discrete amorphous phase, each of which then crystallized independently with rising temperature. Thus, the whole process of crystallization consisted of several stages. Finally a poly-crystalline mixture would be formed.
MAGNETIC AND ELECTRONIC PROPERTIES OF TbFe2 AMORPHOUS FILM
Authors: ZHENG DE-JUAN  , WANG ZHEN-XI  , ZHANG DIAN-LIN  , LIN SHU-YUAN  , LIU LIAN-FAN  , CAI YAN-HUANG  , XIA KE-DING  ,   (1)中国科学院上海原子核研究所; (2)中国科学院物理研究所
Published: November 2020

We have studied magnetic and electrical properties of TbFe2 amorphous film prepared by R. F. sputtering. Saturation magnetization Ms(T) (77-800K), electrical resistivity ρ(T) (4.2-400K) and M?ssbauer spectra (18K, 400K) measurements were made. We obtained the Curie temperature (Tc～400K), temperature of the resistivity minimum (Tmin～360K) and the negative temperature coefficient of resistivity. M?ssbauer spectra at room temperature were resolved using both of the method of Hesse and that of Window. The hyperfine field distributions obtained by both methods are in good agreement. There are two distributions at H=210 kOe and H=25 kOe respectively. The first is consistent with ferromagnetism and the second is probably associated with Kondo-type resistance minimum. The M?ssbauer effect results indicate that the spin of the iron ion is also subjected to a local anisotropy field of random orientation. This result is consistent with the Harris model.
GENERAL RULE ON THE APPEARANCE OF MULTIPLE SOLUTION IN THE DETERMINATION OF CRYSTAL STRUCTURES CONTAINING HEAVY ATOMS
Authors: FAN HAI-FU  , ZHENG QI-TAI  ,   (1)中国科学院生物物理研究所; (2)中国科学院物理研究所
Published: November 2020

In the determination of crystal structures containing heavy atoms, special arrangement of the heavy atoms leads often to the failure of determining uniquely the positions of the light atoms. This is the case not only occured frequently in Patterson analysis but also in heavy-atom method ar direct methods. Hence it is a common difficult problem in crystal structure analysis. The authors have proposed systematically a series of procedures to tackle this problem. The present paper deals with the general rule on the appearance of multiple solution in the determination of crystal structures containing heavy atoms. It is concluded that whenever the distribution of heavy atoms possesses higher symmetry than that of the light atoms by an additional inversim centre and lor sulperiodicity of translation, multiple solution would be obtained for the light atoms that two or more structure images of the light atom portion related by the additional symmetry would result simultaneously.
ELECTROSTATIC SHIELDING OF A TEST PARTICLE IN AN ANISOTROPIC PLASMA
Authors: LU QUAN-KANG  , CHEN ZHI-FAN  ,   复旦大学物理系
Published: November 2020

In an anisotropic plasma, the electrostatic shielding of a static test particle is always complete for an arbitrary distribution function. In this paper the analytical formula and the numerical values of the electrostatic shielding potential in a bi-Max-wellian plasma are given. When the distance R is large, the potential is proportional to R-3. Under certain conditions, there might appear some supershielding regions about the test particle.
AN EMPIRICAL CORRELATION BETWEEN SUPERCONDUCTING ENERGY GAPS 2△0 AND THE HALL COEFFICIENTS IN AMORPHOUS SUPERCONDUCTORS
Authors: CAO XIAO-WEN  ,   中国科学院等离子体物理研究所
Published: November 2020

An empirical correlation between superconducting energy gaps 2△0 and the Hall coefficients RH of amorphous state and between superconducting energy gaps 2△0 of amorphous state and the Hall coefficients RHL of corresponding liquid metals is found respectively, that is: in numerous non-transition metals and alloys, 2△0 takes a maximum value as RH (or RHL)=-3.5--4.0×10-11m3/AS.
ELECTRICAL RESISTIVITY AND LONGE-RANGE ORDER IN Cu3Au
Authors: LEI XIAO-LIN  ,   中国科学院上海冶金研究所
Published: November 2020

In this paper, an explanation for the increase in temperature coefficient of electrical resistivity of Cu3Au with increasing degree of long-range order is given on the basis of a recent theory of resistivity for crystalline alloys proposed by the author. The ρT and dρ/dT of Cu3Au calculated by using a simple model pseudopotential appear to be in relatively good agreement with experimental data.
INVESTIGATION OF THE DEFECTS IN SILICON SINGLE CRYSTALS GROWN BY FLOATING-ZONE METHOD IN THE ATMOSPHERE CONTAINING HYDROGEN
Authors: YANG CHUAN-ZHENG  , ZHU JIAN-SHENG  ,   中国科学院上海冶金研究所
Published: November 2020

Defects in dislocation-free silicon single crystals grown by floating-zone method in the atmosphere containing Ar-H2 or H2 were investigated by means of chemical etching and X-ray projection topography. It has been found that anomalous etch pits and defect density are closely related to the hydrogen content. (Change of the defect density with hydrogen content shows a maximum at approximately 10% hydrogen for ay-grown crystals. After annealing at high temperatures, the defect density in the inner part of the crystal is found to be more than that at the surface and also more than that in as-grown state when hydrogen content is greater than 25% in the atmosphere.) Defects in annealed crystals grown in the pure hydrogen atmosphere have been observed. The relationship between some defects showing in topographs and etch patterns was found. Effect of annealing on wafer with these defects was also observed. Finally, clustering and precipitating of hydrogen have been discussed. Dislocation loops formed at precipitate-matrix interface were described. The process of motion and interaction of the loops as well as the forming of multi-centre loops at high temperatures were also discussed briefly.
SPACE FREQUENCY BANDWIDTH OF RAINBOW HOLOGRAM AND ORDINARY HOLOGRAM
Authors: ZHANG YOU-WEN  , CAI LI-ZHONG  , ZHU WAI-GUANG  ,   (1)山东大学; (2)上海交通大学
Published: November 2020

According to the Fresnel-Kirchhoff diffraction theory, we have analyzed systematically the space frequeney bandwidth of rainbow hologram and ordinary hologram as the object, slit, reference source and holographic plate are in different relative positions. For each of these cases, a universal fomula of frequency bandwidth has been derived, it is suitable not only to rainbow hologram but also to ordinary hologram. The theory given here may be useful for space frequency bandwidth compression and plate choice.
A METHOD TO ACHIEVE OPTICAL MULTI-CHARACTERISTIC PATTERN RECOGNITION
Authors: LIU JI-LIN  , DAI JIAN-HUA  , ZHANG HONG-JUN  ,   中国科学院物理研究所
Published: November 2020

The projections of an input image on the Schmidt orthogonalized basis functions are determined from the crosscorrelation matrix of the input and the reference image, so a novel method for multi-characteristic pattern recognition has been provided. The experimental demonstrations are in agreement with the theory.
ON THE THIRD ORDER OPTICAL NONLINEARITY NEAR EXCITON LINES
Authors: GAN ZI-ZHAO  , YANG GUO-ZHEN  ,   (1)北京大学物理系; (2)中国科学院物理研究所
Published: November 2020

In this paper, a theoretical method is presented to calculate the third order optical susceptibility which is induced by the saturation effect of light absorption near exeiton lines. In particular, the numerical results of the nonlinear susceptibility are given in both exeiton lines of GaAs and exeiton lines of the yellow series of Cu2O.
THE DIFFERENTIAL CURVE OF Tc WITH RESPECT TO λ
Authors: LIU CHANG-WEN  , WU HANG-SHENG  ,   中国科学技术大学物理系
Published: November 2020

In the present paper, the conclusion we arrive through analyzing the (dTc/dλ)-λ curve is that the Tc-λ curve is composed of three parts with entirely different properties, namely, "McMillan region", "λn region" and "series solution region". This conclusion is identical with that obtained in paper [20] except that the value of n is, in general, not equal to 1.55 but is a real number larger than 0.5 and varies with, the shape of the effective phonon spectrum.
QUASI-ELASTIC STRONG LIGHT SCATTERING IN α-LiIO3 SINGLE CRYSTALS INDUCED BY IONIC TRANSPORTATION
Authors: XU ZHENG-YI  , ZHANG AN-DONG  , XU GANG  , YANG HUA-GUANG  , LI YIN-YUAN  ,   中国科学院物理研究所
Published: November 2020

The strong quasi-elastic scattering of light observed with a laser beam transmitting through an α-LiIO3 single crystal under the action of a DC field in the c-direction was further investigated. we recognized that the phenomenon consists of the following: (1) A scattering band appears perpendicular to the c-axis and extends to very large scattering angles. The scattered beam is the ordinary light, if the incident beam is the extraordinary light; and vice versa. If the incident beam contains both the ordinary and extraordinary components, two bands may be observed slightly separated in the azimuthal direction. (2) A band extends in the same direction as (1), but the polarization state does not change after scattering. (3) The scattered beam produces a pattern with one or a number of stripes in tilted directions other than those of c-axis. Their spatial frequency spectra are rather limited and the polarization state does not change. For all the three types of scattering we recorded the fine structure of intensity distribution vs the scattering angle, the relaxation of light scattering after the DC potential having been removed and the variation of the scattered intensity with the change of the locality through which the incident beam passes. Because of the behavior of unidimensional ionic conduction in α-LilO3, it is possible to prepare a specimen such that in a certain part of its volume the field is strong but no current flows. We noticed that no scattering occurs when the light passes through only such a space in a specimen. The strength of scattering is apparently associated with the current density. The scattering (1)-(3) may be interpreted as a radiation process of second order, phenomenologically described by the time and space fluctuation of the diagonal and nondiagonal components of the dielectric tensor. They are originated from the distribution and redistribution of the space charge. The nondiagonal components are now not zero even referred to the principal axes of the crystal. The fine structure of scattered intensity and related features should be attributed to the decoration of quasiperiodical defects.
SILICON IMPLANTATION IN SEMI-INSULATING GaAs SUBSTRATE
Authors: WANG WEI-YUAN  , QIAO YONG  , LIN CHENG-LU  , LUO CHAO-WEI  , ZHOU YONG-QUAN  ,   中国科学院上海冶金研究所
Published: November 2020

Semi-insulating GaAs substrates doped with chromium were implanted with 120-160 ke V28Si+ ions (1012-1013 cm-2 at room temperature. After thermal annealing, the carrier concentration and mobility profiles, residual damage and impurity levels of implanted wafer were determined by C-V method, back scattering technique and photo-1uminescence spectra. The results showed that the semi-insulating GaAs substrate selection and 28Si+ beam purity control are necessary to obtain reproducible and high activation implantation. Fabricated with multiple localized silicon implantation for both active and contact layer, GaAs dual-gate MES FET applicated in UHF TV tuner reached a noise figure of 0.9 dB and an associated gain of 10 dB at 1 GHz. The mobility profile and appropriate annealing temperature are discussed on the basis of the present experimental results.
ION OPTICAL THEORY FOR THE THIRD ORDER TRAJECTORY IN A CROSSED TOROIDAL ELECTRIC AND INHOMOGENEOUS MAGNETIC FIELD (II)——TRANSFER MATRIX, LIOUVILLE'S THEOREM AND TRANSFORM MATRIX
Authors: CHENG REN-SHU  , XIMEN JI-YE  ,   北京大学无线电电子学系
Published: November 2020

In this part, the ion optical theory for the third order trajectory in a crossed toroidal electric and inhomogeneous magnetic field is treated in detail. The transfer matrix are derived up to the third order. Consequently, for an ion optical system possessing the second and third order aberrations, the determinant of the transfer matrix is shown to be equal to 1. In order to transform the transfer matrix between different deviations the transform matrixes are derived. Some related equalities and corresponding relations for the elements of S and H matrixes are given. These results may be of use in designing mass spector meters.
THEORY OF OPTICAL BISTABILITY IN TWO-PHOTON RESONANCE MEDIA
Authors: YE PEI-XIAN  , ZHANG YI-XIANG  ,   中国科学院物理研究所
Published: November 2020

In this paper, the optical bistability in two-photon resonance media is discussed theoretically. The steady-state behavior in both the cases of two-photon far- and near-resonance, and the transient behavior in the case of two-photon near-resonance are analysed. The two-photon vector model is established and applied to the analyses. The corresponding characteristic curves in sodium vapour are given based or the result of numerical calculation.
IN SITU TEM STUDIES OF FERROELECTRIC PHASE TRANSITIONS IN Ba2NaNb5O15 AND LiTaO3
Authors: HU MEI-SHENG  , FENG DUAN  ,   南京大学物理系
Published: November 2020

In this paper we presented our experimental results of in situ TEM observations of ferroelectric phase transitions in BaBa2NaNb5O15 (Tc =550℃) and LiTaO3 (TC = 660℃). At room temperature the domain patterns are of the scale 0.2-1 μm. Increasing the temperature to near Tc, the micro-domains forming quasi-regular arrays of the scale about several hundreds of angstroms have been observed and interpreted according to a model slightly modified from that of Селок. A strong susceptibility to radiation damage is found in LiTaO3 near phase transition temperature which may be connected with soft modes of phase transitions.
THE CRYSTAL STRUCTURE OF ARMILLARINE
Authors: HE CUN-HENG  , XU CHANG-FU  , BAO GUANG-HONG  , MU SHAN-TIAN  ,   中国医学科学院基础医学研究所
Published: November 2020

The Armillarine (C24H30O6) crystal belongs to the orthorhomcic system with space group P21 21 21 and unit cell parameter α= 18.784(9)?, b = 14.002(7)?, c = 8.598(5)?, z= 4. The calculated density Dc= 1.216 g· cm-3.The intensity data were collected on the Philips PW-1100 diffractometer. The structure was determined by MULTAN-80 with the statistically weighted tangent formula after MULTAN-78 had been proved unsuccessful. The structure has been refined by full-matrix least-squares method to a final R value of 0.076 for 1624 reflexions. The hydrogen atom locations were determined by difference Fourier synthesis.
RESEARCH ON DIBENZO-18-CROWN-6 AND YTTRIUM ISOTHIOCYANATE COMPLEX (Ⅱ) ——DETERMINATION OF THE CRYSTAL STRUCTURE
Authors: XU ZHANG-BAO  , GU YUAN-XIN  , ZHENG QI-TAI  , SHEN FU-LIN  , YAO XING-KAN  , YAN SI-PIN  , WANG GEN-LIN  ,   (1)南开大学; (2)中国科学院
Published: November 2020

Dibenzo-18-Crown-6 Yttrium Isothiocyanate crystal is the complex of Crown and Yttrium Isothiocyanate. The molecular formula is C23H24O6N3S3Y. The crystal belongs to the orthogonal system, with space group D2h-Pmcn. The cell dimensions are a= 19.885(9)?, b = 17.283(8)?, c = 7.942(3)?. Pour molecules are contained in a cell (z = 4). The nine-coordination polyhedron around the Y(111) ion was formed by six oxygen atoms and three nitrogen atoms of three NCS- acid radicals in the molecule. The space group of the molecule is Cs. The intensity data were collected on a PW-1100 four circle diffractometer. The total number of independent diffractions amounts to 2859. The crystal structure has been determined by Patterson method and the refinement of the structure parameters was achieved by block-matrix least-square method, R=0.073. All the positions of hydrogen were located by the difference syntheses.
AUTOMATIC INDEXING OF ELECTRON DIFFRACTION PATTERNS FROM TILTED CRYSTAL
Authors: YANG QI-BING  , ZHANG XIU-MU  , CHANG XIN  ,   中国科学院金属研究所
Published: November 2020

The formula of indexing electron diffraction patterns from tilted crystal is as follows, [hkl]=[xy0]Γ(θ)Γ(ω0-ω)Γ(θ0)P-1H, where θ,ω are rotating angles and θ0,ω0 primary ones. A program applicable to all the crystal Systems has been worked out. This method is simpler and faster than that of stereographic projection.
SPONTANEOUS MAGNETIC FIELD DUE TO TE WAVE IN A SPHERICALLY SYMMETRIC LASER PLASMA
Authors: SHEN WEN-DA  , YUAN JIE  , ZHU SHI-TONG  ,   (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
Published: November 2020

We have discussed the spontaneous magnetic field in a spherically symmetric laser plasma. The expression for the spontaneous magnetic field due to TE wave is derived. This solution is contrasted with results of S-polarized wave in a planar plasma. By means of our theoretical result, the performance of the spontaneous magnetic field observed in recent experiments can be explained.
EXPERIMENTAL STUDIES OF AN UNCORRELATED DOUBLE-BEAM TUNABLE DYE LASER
Authors: ZHANG ZHI-GUO  , ZHU WEN-SEN  , ZHANG ZE-BO  , ZHAO YU-YING  , LIU JING-BAO  , ZHANG RUI  ,   (1)北京大学物理系,78届毕业生; (2)中国科学院物理研究所
Published: November 2020

In this paper, we report a new design of a rectangular uncorrelated double-beam tunable flashlamp pumped dye laser. The output of this laser can give simultaneously two laser beams with different frequencies by using two different dyes. The frequency difference of these two beams can be large, and they are easy to synchronize and do not have mode competition. Structure design and typical experimental results are presenied. A brief discussion is also given.
THE NONTHERMAL RADIATIONS NEAR THE HORIZONS IN A STATIONARY RIEMANN SPACE-TIME
Authors: ZHAO ZHENG  ,   北京师范大学物理系
Published: November 2020

In this paper, it is proved that the crossing of the positive and negative energy levels must occur, and the. nonthermal radiations also must be generated near a horizon irrespective of the detailed form of the metric when there exists static electromagnetic field or "dragging movement" of the space by the gravitational field near the horizon.
LEVEL CROSSING EFFECT IN DEGENERATE FOUR-WAVE MIXING
Authors: FU PANG-MING  , MI XIN  ,   中国科学院物理研究所
Published: November 2020

Third-order nonlinear susceptibility x(3)(-ω;ω,ω,-ω) is calculated in nearly-degenerate quasi-two-level system by perturbation method. We have studied the level crossing effect in degenerate four-wave mixing and compared it with the level crossing effect in resonance fluorescence. The possibility of using level crossing effect in degenerate four-wave mixing to measure the relaxation rate of upper and lower state is pointed out.
ON THE BRAGG-DIFFRACTION OF SURFACE ACOUSTIC WAVES BY ACOUSTIC GRATING
Authors: WANG ZOU-QING  , ZHOU SU-HUA  , WANG CHENG-HAO  ,   中国科学院声学研究所
Published: November 2020

The surface acoustic wave diffraction phenomena on acoustic gratings in Bragg regime have been explored.The modal approach has been used to treat this problem under strong Bragg condition. Some results, including the eigen-modes in the grating, the equation of the deflected angles, and the analytical expression of deflection efficiency which depends on the operation frequency and the grating parameters, have been obtained.Experimentally, the image of the diffraction acoustic fields on acoustic grating which was composed of some aluminium film stripes on y-cut LiNbO3 crystals have been visualized by means of Schlieren method. Some excellent photographs of diffraction fields have been obtained, and the deflection angles and deflection efficiency at different frequency have been measured by using optical method. The comparison between the theoretical and the experimental results shows that the agreement is satisfactory.
THE ABSORPTION SPECTRUM OF d2 IONS IN ATRIGONALLY DISTORTED CUBIC CRYSTAL FIELD
Authors: MA DONG-PING  , HU ZHI-XIONG  , XU YI-SUN  ,   (1)成都农机学院; (2)成都农机学院,四川师范学院
Published: November 2020

By using the irreducible tensor operator method, two corollaries have been derived from generalized Wigner-Eckart theorem and the results associated with the corollaries are obtained. For the. d2 ions in a trigonally distorted cubic crystal field, the effective method dealing with overall problems of D, g‖, g⊥ and absorption spectrum has been suggested on the basis of unified model, in which all possible interaction of Vc and (Vtr + Hs) have been considered.In application to vanadium corundum, successful results in agreement with the experiments are obtained by overall fitting of the theoretical values to the observed values of D,g‖, g⊥ and absorption spectrum.The problems concerned in our model and methods have been discussed.
ON ABERRATION THEORY OF THE COMBINED ELECTROMAGNETIC FOCUSSING CATHODE LENSES
Authors: ZHOU LI-WEI  , AI KE-CONG  , PAN SHUN-CHEN  ,   北京工业学院
Published: November 2020

In this article, the aberration theory of the combined electromagnetic focussing cathode lenses is described, and the two previous representative papers concerning the aberration theory of cathode lenses, the first contributed by Ximen Jiye (1957) and next by B. B. Bonschtedt (1964), are emphatically analyzed and commented. It is shown that the formulae of aberration coefficients for the cathode lenses given by them, although different in form, can be transformed from one to another; and it is enough to prove that the criticism of B. E. Bonschtedt addressed to Ximen Jiye, is improper.It is worth noicing that the aberrations of cathode lenses must be considered atthe image plane with regard to ε(x1)-a certain initial energy of electron in axialdirection, then the formulae of all the transverse aberrations including the first order and third order aberrations for the combined electromagnetic focussing cathode lenses can be derived. It is expected that these formulae will be closer to practice than those derived formerly.
A STUDY ON THE SUPERCONDUCTIVITY OF FAST QUENCHED Al-Si-Ge ALLOY
Authors: Chen Xi-chen  , Guan Wei-yan  , Yi Sun-sheng  , Wang Zu-lun  , Lin Ying  ,   中国科学院物理研究所
Published: November 2020

The effect of heat treatment on the microstructure and superconducting properties of the alloy Al-8.3 at% Si-8.5 at% Ge prepared by the splat quenching technique has been studied. The results of structure analyses indicate that the rapidly cooled alloy consists of two phases: a supersaturated α-Al (Si, Ge) solid solution (matrix) and amorphous Al-Si-Ge spheres, these spheres connect with each other and form a continuous canal. After annealing at 100℃ for 50 h., the spheres decrease in size and the continuous canal disappear and some dispersive Si (Ge) granules separate out from the amorphous phase. Two superconducting-normal transitions have been found in the resistance-temperature and resistance-magnetic feild curves of the sample after annealing at 100℃ for 50 h. These results can be interpreted by the existence of two superconducting phases in this sample.
THE MAIN REFLECTED WAVE FIELD OF THE COHERENT LIGHT FROM SURFACES WITH SMALL CRATERS AND PARTICLES
Authors: CHENG LU  , LIU ZHI-GUO  ,   南开大学物理系
Published: November 2020

The general expression of the expectation of the main reflected wave field of the coherent light from surfaces with randomly distributed small craters and particles is deduced with a statistical model called "randomly random walk". Curves are computed for the case of normal probability density distribution.
TWO-PHOTON OPTICAL MULTISTABILITY THEORY
Authors: LI FU-LI  ,   中国科学技术大学物理系
Published: November 2020

The theory of the optical multistability by two-photon resonant interaction is investigated. The nonlinear medium inside a Fabry-Perot cavity is in two-photon resonance with the laser beam. The two-photon equation of state including dynamical Stark shift and relaxation parameters is obtained and studied under mean-field approximation. The equations for both Fabry-Perot cavity and ring cavity take basically the same form. The physics mechanisms resulting in optical multistability are also studied. It has been shown that the combined effects of Kerr switching and saturation absorption switching can lead to two-photon optical double-bistability, tristability as well as bistability. Furthermore, the criterion conditions under which double-bistability or tristability can occur are given and discussed. Finally, the phase-conjugated reflectivity by two-photon four-wave mixing is also shown to exhibit multistability as well as hysteresis.
STUDY ON SHOCK WAVE-EXPLOSIVE ENERGY CONVERTION OF FERROELECTRICS
Authors: Wang Yong-ling  , Yuan Wan-zong  , He Guo-rong  , Lin Sheng-wei  , Ling Rong-hua  , Qu Cui-feng  ,   中国科学院上海硅酸盐研究所
Published: November 2020

The phase transition properties of Nb doped PZT 95/5 type ferroelectric ceramics under the action of shock wave in "normal mode" condition have been investigated. Under the condition of parallel inductance-capacitance load, the maximum current 1360A has been obtained. Under the condition of resistance load, the maximum voltage 145×103 V was obtained. These results are in good agreement with theory.
THE QUASI BOUND STATES OF DIRAC FERMION IN SCHWARZSCHILD METRIC
Authors: Zhang Shi-wei  ,   上海市化学工业学校
Published: November 2020

In this paper, the two-component Dirac equation in Schwarzschild background space time is reduced to a one component second order equation. The effective potential and the L-S coupling term are given. Near the horizon, there is a potential wall. When K2>3η2, there is another potential well by the wall. So the particle resonating in the well will be absorbed by the horizon after penetrating through the wall. With WKB approximation, the resonance spectrum and its width are obtained. For the case of Re-issner-Nordstrom background space time, the same procedure is also carried out, and the results are discussed briefly.
EXPERIMENTS ON DIRECTOR WAVE IN NEMATIC LIQUID CRYSTAL
Authors: ZHU GUO-ZHEN  , NI HUI  , ZHANG WEN-ZHU  ,   清华大学物理系
Published: November 2020

In a homotropic nematic cell, a solitary-like director wave is excited by a mechanical method. A series of photographs of the wave propagation process are obtained. When white light is used, we noticed the propagation of some dark lines along the cell, and we got the plot of the positions and velocities of the dark lines vs time. According to the results obtained from the interference patterns of focused polarized light, it was shown that the dark lines correspond to a perpendicular alignment state of the director, in addition, the scattered light by liquid crystal is observed clearly on the two sides of dark lines. From the wave propagation process recorded by monochromatic light, and by using an one dimension postulat, we calculated the spatial distribution of the directors. Finally, some discussion on the physical model of the director wave is given.
THEORETICAL EXPLANATION OF THE LIGHT DIFFRACTION DUE TO SPACE CHARGE FLUCTUATION IN THE QUASI ONE-DIMENSIONAL IONIC CONDUCTOR-α-LiIO3 (I)——ANISOTROPIC MODES
Authors: GU SHI-JIE  , LI YIN-YUAN  ,   中国科学院物理研究所
Published: November 2020

A theoretical treatment was developed to explain the light diffraction bands normal to the c-axis subtending large angle and strong in intensity which were investigated in much details with a -LiIO3 single crystals under the action of a d. c. field. It is assumed only that a fluctuation of the space charge density Sp (x, y) appears as ionic transportation taking place in the c-direction. The related internal field sE (x, y) produces δεij (x, y) for the dielectric tensor through the linear electro-optic effect. As a consequence, anisotropic phase gratings come into existence in the crystal. With such a model we successfully explained quantitatively or qualitatively all observed phenomena such as the polarization of diffracted beams turning π/2, the angular distribution of diffracted intensity being asymmetric and possessing a minimum, and those observed using specimens of different absolute configurations being related as mirror images. The relative positions of the diffracted bands and their shapes observed with specimens cut in different orientations with respect to the c-axis were found in agreement with our theoretical derivation. The variation of the angular position of the minimum intensity with the change of the incident angle were calculated and satisfactory results were obtained. Therewith we evaluated for the first time the ratio of two elements of the electro-optic tensor γ42/γ41=1.6 in a d. c. field.
PHASE DIAGRAM OF THE Dy-Sn BINARY SYSTEM
Authors: CHEN RONG-ZHEN  , ZHENG JIAN-XUAN  ,   广西大学物理系
Published: November 2020

A phase diagram of the alloys of the Dy-Sn binary system has been investigated by means of X-ray diffraction method and differential thermal analysis. The intermetallic com- pounds DySn2,Dy5Sn3,Dy5Sn4 and Dy11Sn10 were detected, and the new intermetallic Compounds Dy2Sn,DySn,Dy8Sn9,Dy4Sn7 and DySn4 were observed.There are four eutectic reactions and six peritectic reactions in Dy-Sn system. Dy2Sn,DySn,Dy4Sn7 melt congruently at 1237℃, 1222℃ and 1154℃ respectively, and Dy5Sn3,Dy5Sn4,Dy11Sn10,Dy8Sn9,DySn2 and DySn4 decompose at peritectic reaction temperatures 1140℃, 1160℃, 1175℃, 1134℃, 738℃ and 442℃ respectively. There exists a Crystal melting transformation at 1182℃ in Dy-rich region.DySn4 does not show any detectable Solid solubility in Sn and Sn shows solid solubility up 5 wt% to in α-Dy and 7 wt% in β-Dy.
THE PERIOD-DOUBLING BIFURCATION SEQUENCES OF THE TRIMOLECULAR MODEL WITH FORCED OSCILLATION TERM
Authors: WANG GUANG-RUI  ,   北京8009信箱
Published: November 2020

In this paper, we discuss the trimolecular model with a forced oscillation term. We carried out the numerical calculations. Some results are given for the case of forced oscillation amplitude c=0.05 and forced oscillation frequencies D over a certain range. We have found the 2n-point periodic sequences by analyzing these results and cam-pared them with Peigenbaum constant δ .
U-SEQUENCE OF PERIODIC SOLUTIONS IN THE FORCED BRUSSELATOR
Authors: WANG GUANG-RUI  , ZHANG SHU-YU  , HAO BAI-LIN  ,   (1)北京8009信箱; (2)中国科学院物理研究所
Published: November 2020

Detailed numerical study shows that along certain directions in the parameter space the periodicity of the forced Brusselator appears in the same order as that in one-dimensional nuimodal mappings, i.e. in accordance with the U-sequence of Metropolis, stein and Stein. We find a simple method to assign words from a symbolic dynamics of two letters to periods in the model. Our results show the neccesity to enlarge the parameter space in similar research ia order to have a global picture of the bifurcation and chaos "spectrum".
GENERAL EXPRESSIONS OF THE CHARACTERISTIC FREQUENCY AND GRüNEISEN COEFFCIENT FOR SOLIDS
Authors: ZHANG WAN-XIANG  ,   北京8009信箱
Published: November 2020

Starting from the general expresson of frequency given by the dynamical theory of crystal lattices, we have derived three different expressions of the characteristic frequency for three kinds of solids, and re-obtained rS,rD-M and rf. We pointed out that rS,rD-M and rf. belong to three different models of solids. Finally, the general expressions of the characteristic frequency ω and Grüneisen coefficient γ for solids were found.
CALCULATION FOR THE SPLITTING CHAIN OF CRYSTAL-FIELD ENERGY LEVELS OF Pr3+-DOPED LiYF4 CRYSTAL
Authors: XIU SHANG-DA  , HUANG FU-HUA  , XU PENG-SHOU  ,   中国科学技术大学
Published: November 2020

In this paper. Tang's tensor operator method is applied to a fitting calculation of crystal-field energy levels of the rare earth ions. The splitting chain of energy levels of LiYF4: Pr3+,crystal-field parameters and approximate wave functions cor-reoponding to the crystal-field group chain R3?Td?D2d?S4 are ohtoined. These results can he used to analyse various prohlems, such as space charge distribution, spectral line intensity and other optical, magnetic and thermodynamic properties in cases with different approximate symmetry.
αs(Q2) AND INTERACTION POTENTIAL BETWEEN THE HEAVIER STRATONS
Authors: GOU LIANG  , HUANG TAO  ,   中国科学院高能物理研究所
Published: November 2020

In this letter, we suggest a possible interaction potential between the heavier stra-tons by considering the asymptotic freedom at the lorge Q2 and the multi-gluons effect at the lower Q2 in the QCD, and calculate the spectrum of the J/ψ and the γ families. The result is in agreement with experiments. In addition, we discuss a possible mass spectrum of T(tt) family.
A STEEP CHANGE IN THE TEMPERATURE DEPENDENCE OF THE STICKING COEFFICIENT OF In ATOMS ON THE Si(111)4×1-In SURFACE
Authors: ZHOU JUN-MING  , HUANG YI  , LIN ZHANG-DA  ,   中国科学院物理研究所
Published: November 2020

AES and RHEED techniques have been applied to a study of temperature dependence of the sticking coefficient of In atoms on the Si(lll)4×1-In surface. At temperatures below 110℃, the sticking coefficient for In atoms is close to zero due to saturation of valence bonds resulting from the arrangement of In atoms in the 4×1-In overlayer. The steep change of the sticking coefficient in the temperature range 110-120℃ may be explained by a model of the order-disorder transition arisen from the surface melting. At temperatures above 120℃, the sticking coefficient of In atoms is always close to unity.
A MOSSBAUER INVESTIGATION OF THE IRON-SODIUM-SILICATE GLASS SYSTEMS
Authors: XIA YUAN-FU  , LIU RONG-CHUAN  , WANG SHU-XIN  , XU CHAO  , PAN SHU-YING  , CHENG YI-BING  ,   (1)南京大学物理系; (2)南京大学物理系,南京邮电学院; (3)武汉建材学院
Published: November 2020

Mossbauer absorption measurements have been made at room temperature on 57Fe in Na2O-Fe2O3-SiO2 and Na2O-Fe2O3-SiO2-B2O3 systems. The states of the ferrous and ferric ions have been studied on the basis of Mossbauer parameters. A basic model of the iron in these glass systems is then proposed.
SOLITON PROPAGATION IN LIQUID CRYSTALS UNDER SHEAR FLOW
Authors: LIN LEI  , SHU CIIANG-QING  ,   中国科学院物理研究所
Published: November 2020

Detailed calculations of the properties of soliton propagation related to director motion in nematic liquid crystals under shear flow (including the presence of external magnetic or electric field) are given for the first time. Analytic soliton solutions are obtained when wave velocity is large. The properties of soliton solution, the energy of soliton and the interference patterns of polarized (monochromatic or white) light caused by the movement of such solitons are calculated and discussed. Eecent experiments of Refs. [12] and [13] are analysed and the dark lines observed in liquid crystal MBBA are shown to correspond to the type A soliton presented in this paper.