bluuebunny/crossref_metadata_2025 huggingface dataset:
MEASUREMENT OF MINUTE RADIOMETRIC QUANTITIES IN THE SPECTRAL RANGE FROM VISIBLE TO NEAR INFRA-RED
Authors: ZHENG JIAN-SHENG  ,   厦门大学物理系
Published: November 2020

This paper describes a method of calibrating the absolute spectral sensitivity of silicon photovoltaic cell. The cell was used for measuring minute radiant power, irradiance and radiant intensity of radiations, ranging from 0.4 μm to 1.1 μm. It was also used for measuring the external quantum efficiency of electroluminescent devices. The sensitivity of the system is higher than that of the conventional thermopile by three orders of magnitude. By incorporating with an integral sphere, it is very convenient to measure the radiant power, ranging from 6.3 nW to 310 mW, of any uniformly or non-uniformly distributed source.The maximum spectral efficiency Km was determined by using this system, and the accuracy of radiometrie system and photometric system was discussed. Finally, the measured optical parameters of some light-emitting diodes were examined.
GENERATION OF PHASE CONJUGATED BACKWARD WAVE BY DEGENERATE FOUR-WAVE MIXING IN CHLOROPHYLL SOLUTION
Authors: WU CUN-KAI  , FAN JUN-YIN  , WANG ZHI-YING  ,   中国科学院上海光学精密机械研究所
Published: November 2020

In this paper, the first experiment of generating the phase conjugated backward wave by degenerate four-wave mixing in chlorophyll solution is reported. It is demonstrated that the efficiency converting the incident object beam into the phase conjugated backward wave with interaction length 5mm long has approached 22%. This is a four-level system having a high conversion efficiency. The intensity of the complex conjugate reflected wave is proportional to that of the incident object wave as we kept the pumping beam intensity constant. The phase conjugate behaviours of the backward wave have been demonstrated. By using the phase conjugate nature of the reflected wave, good quality reconstructed images of a grid are obtained through a phase distorting media.
LOW FREQUENCY INTERNAL FRICTION OF IRON IN THE PROCESS OF PLASTIC DEFORMATION
Authors: ZHANG JIN-XIU  , OU GUANG-LIAN  , HU YIN-XUN  ,   (1)中山大学物理系; (2)中山大学物理系,金属物理专业1965年毕业生
Published: November 2020

The internal friction of Armco-iron in the process of plastic deformation was measured by a middle torsion pendulum on a modified tensile testing machine. The effects of strain rate (in the range of 0.73×10-6/sec to 50×10-6/sec), frequency (0.30/sec to 3.6/sec), annealing and carbon content on the internal friction were studied. The results showed that on the yielding plateau, the internal friction did not change with the strain, but increased linearly with the increase of strain rate and varied inversely with frequency. In comparing the data with the theoretical expression derived from the dislocation dynamic model of internal friction in the process of plastic deformation, it is shown that the dynamic model is in good agreement with the experimental results. The dislocation dynamic exponent m of Armco-Fe derived from this model is 10.8-12.3, which is reasonable.The range within which the dislocation dynamic model holds is also discussed.
PULSE WIDTH MEASUREMENT OF THE PASSIVELY MODE-LOCKED Nd:YAG LASER BY NONCOLLINEAR SHG METHOD
Authors: LIN JIN-GU  , LIU CHENG-HUI  , ZHU ZHEN-HE  , LAI RUI-SHENG  , HUO CHONG-RU  ,   中国科学院物理研究所
Published: November 2020

The noncollinear SHG method has been used to measure the pulse width of passively mode-locked Nd: YAG laser. The nonlinear ADP crystal is oriented in such a way that phase matched SHG is produced only when both incident beams are present as ordinary rays. The angle between the two beams is 25°50′. Phase-matched SHG as an extra-ordinary occurs at an angle bisecting the two beams. The correlation width obtained with passively mode-locked Nd: YAG corresponds to a pulse width of 24 ps.
AN OPTIMAL SELECTION METHOD ON STARTING REFLEXION SET IN DIRECT METHOD
Authors: ZHENG QI-TAI  ,   中国科学院生物物理研究所
Published: November 2020

In the direct method of crystal structure determination, one usually applies the symbolic addition method and multiple tangent-formula method. For determination of the phase, the selection of starting reflexion set is a key problem for successful analysis of the crystal structures. The convergence method has been applied for determination of starting reflexion set. This paper presents an optimal selection method on starting reflexion set on the basis of the relations between the diffraction indexes and gives an example of examining a known structure.
A X-RAY STUDY OF IMPERFECTION IN SYNTHETIC FLUOROPHLOGOPITE CRYSTAL
Authors: GUO CHANG-LIN  , HUANG YUE-HONG  , FAN SHI-JI  ,   中国科学院上海硅酸盐研究所
Published: November 2020

This paper describes the results of X-ray study of imperfection in the single crystal of large area synthetic fluorophlogopite. By using X-ray Laue method, it is showed that in synthetic mica there is a greater degree of one-dimensional disorder, and therefore there are a number of disarranged regions of stacking sequence and their boundaries. The X-ray diffraction topography method shows that most of sub-grain boundaries and dislocations originate from the seed and run normal to the growth surfaces. The density of crystal defects in the region near the crystal surface is greater than that in the center. The difference in the distribution of defects between synthetic mica and natural mica was investigated. The relationships between defects in synthetic mica plate and their performances as used to construct condenser were also studied and discussed.
THE QUANTITATIVE EDS ANALYSIS OF THE CONSTITUENTS OF BINARY ALLOYS WITHOUT STANDARD SAMPLES
Authors: WU ZI-QIN  , GAO QIAO-JUN  , GE SEN-LIN  ,   北京大学物理系
Published: November 2020

In general, the quantitative electron probe microanalysis is based on comparisons with standard samples. In this article, a method of the quantitative analysis of binary alloys without reference to standard samples is introduced. After simultaneous measurements of the ratios of the Ka photons of two elements in the binary alloys (Cu-Ga, GaAs) in SEM-EDS equipment, the constituents of the binary alloys are calculated from a simplified formula for the energy loss of the incident electrons, the X-ray excitation cross-section and the secondary fluorescence. When the overvol-tage of the incident electrons is kept in the range 2-3, the calculated results show good agreement with the actual constituents. The "instrument sensitivity" of the characteristic X-ray of the pure elements determined in the literature is calculated and discussed by using this simplified model.
MEASUREMENT OF THIRD-ORDER SUSCEPTIBILITY BY DEGENERATE FOUR-WAVE MIXING
Authors: WU CUN-KAI  , WANG ZHI-YING  , FAN JUN-YIN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

In this paper, degenerate four-wave mixing was studied in various transparent optical media. Third-order susceptibility has been determined by the ratio of the input probing beam in tensity to the backward wave intensity in four-wave mixing. The results of some solvents and glass media are presented.
THE ANOMALOUS PROPERTIES IN VISCOSITY NEAR N→SA TRANSITION POINT OF LIQUID CRYSTALS
Authors: FENG KE-AN  ,   中国科学院物理研究所
Published: November 2020

Near the N→SA transition point, recent observations show that the anomalous increase in the volume viscosity is much greater than that of the shear viscosity. This is explained in terms of the time correlation function for viscosity. The reason for the disagreement between the experimental results and the Brochard's theory is also given.
THE GENERAL TYPES OF MULTIPLE SOLUTION IN PATTERSON METHOD FOR LOW SYMMETRY SYSTEMS
Authors: ZHENG QI-TAI  ,   中国科学院生物物理研究所
Published: November 2020

In solving the crystal structures containing heavy atoms by patterson method, if the heavy atoms have a pseudo-symmetry which is higher than that of the whole structure, this will result in multi-solution positions of light atoms (two, four or eight possible positions). Expressed in reciprocal space, this problem is equivalent tc that some of the component signs of the diffraction structure amplitudes are undetermined. Seventy four space groups of low symmetry systems (trielinic, mono-clinic and orthorhombic systems) have been analysed. For an asymmetric unit involving only one heavy atom, with the possible positions of the heavy atom and the pseudo-symmetry given, the multi-solution types of light atoms and the distribution rule for components of diffraction struture amplitudes are obtained. In addition, a possible way for resolving these problems by direct method is proposed.
THE TEMPERATURE DEPENDENCE OF THE POLARON EFFECTIVE MASS
Authors: GU SHI-WEI  ,   内蒙古大学物理系
Published: November 2020

The properties of an electron in the polar crystal is discussed by means of a model which takes account of the atomic property of the lattice. The lattice vibration and the interactions of the electron with the lattice displacement are treated by second quantization method. The self energy, effective mass of the polaron and the temperature dependence of the polaron effective, mass are derived.
THE SPIN WAVE THEORY OF A HEISENBERG FERROMAGNETIC SYSTEM WITH BIQUADRATIC EXCHANGE INTERACTION AT LOW TEMPERATURES
Authors: TAO RUI-BAO  , PU FU-CHO  ,   (1)复旦大学物理系; (2)中国科学院物理研究所
Published: November 2020

We presented here a theory of the Heisenberg ferromagnetic system with biquadratic exchange interaction at, low temperatures. In our theory, the kinematic and dynamic interactions are correctly included. The expansion for Sz in terms of temperature and the temperature dependence of spin wave spectrum are obtained ri-grously.
A METHOD OF MEASURING TENSOR SUSCEPTIBILITY AND EFFECTIVE LINEWIDTH
Authors: LIAO SHAO-BIN  , YIN GUANG-JUN  , LIU JIN  , ZHOU LI-NIAN  ,   北京大学物理系
Published: November 2020

This paper suggests a method of measuring the microwave tensor susceptibility and the effective linewidth using the same sample in both the non-resonanee and re-sononce regions. In this method the applied steady magnetic field can be rotated to form a certain specified angle with the microwave magnetic field, so that the effect of the measured sample on the quality factor of the resonant cavity can be adjusted. The iterative method used by C. E. Patton in the calculation of effective linewidth is extended to the calculation of the components of microwave tensor susceptibility. A brief description of the experimental set and the results of the measurements are presented.
SUPERCONDUCTING Tc AND HETEROGENEOUS HYBRIDIZATION IN CLOSE-PACKED COMPOUNDS
Authors: YIN DAO-LE  , ZHANG LI-YUAN  ,   北京大学物理系
Published: November 2020

The hybridization of conduction band is studied for close-packed compounds by means of LMTO method. We emphasize that the heterogeneous coordination would be a necessary condition for intensifying hybridization. In view of the hitherto basic understanding on electron-phonon coupling, a scheme of relation can be outlined as follows: high Tc => high η => significant hybridization=> significant heterogeneous coordination Various experimental results on A15, Bl and other close-packed compouds are in fair agreement with this basic principle.
THE GENERAL FORM OF MULTI-SOLUTION IN PATTERSON METHOD FOR LOW SYMMETRIC SYSTEM (Ⅱ)——PHASE RELATIONSHIPS OF MULTI-SOLUTION TYPE
Authors: ZHENG QI-TAI  , FAN HAI-FU  ,   (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 order to solve the problem of multi-solution in Patterson analysis using direct method , a model of pseudo structure having the symmetry of the heavy atoms is introduced and the corresponding phase relationships of the multi-solution type are derived.
THE DISSOCIATION MODEL OF POLYATOMIC MOLECULE INDUCED BY INFRARED LASER FIELD
Authors: GAN ZI-ZHAO  , YANG GAO-ZHEN  , HUANG XI-YI  , FENG KE-AN  ,   (1)北京大学物理系; (2)中国科学院物理研究所
Published: November 2020

Based on our previous work, in this paper, we discuss further the mechanism of maltiphoton dissociation of polyatomic molecules in an intense infrared laser field, and obtain non-linear equations which describe the coupling between molecular vibrational modes. Taking SF6 molecule as an example, we calculate numerically the energy transfer time between modes, the Fermi resonance interaction, and the degree of mode excitation by laser field. Finally, the dissociation rate of polyatomic molecule is discussed based on the uni-molecular reaction model, the theortical results are essentially in agreement with experiments.
DEGENERATE FOUR-WAVE MIXING AND PHASE CONJUGATION IN ORGANIC DYE SOLUTIONS
Authors: Wu Cun-kai  , Cui Yang-zhao  , Wang Zhi-ying  ,   (1)北京大学物理系,实习生; (2)中国科学院上海光学精密机械研究所
Published: November 2020

Phase conjugation of forward-wave produced by degenerate four-wave mixing by using nearly resonantly enhanced nonlinearity in orgnic dye solutions. was investigated. Good-quality reconstructed images have been obtained by direct wave-front phase conjugation. Reconstructed images with a resolution of 6 lines/mm were obtained. For rhodamin 6G in alcolol solution of 2.5×10-5 mole, nonlinear reflection coefficient up to 10% has been obtained.
THE ASYMMETRIC LINE SHASPES OF THE M?SSBAUER SPECTRA OF α-FeOOH
Authors: Du You-wei  , Zhang Yu-chang  , Lu Huai-xian  , Jiao Hong-zhen  ,   南京大学物理系
Published: November 2020

We have measured the M?ssbauer spectra of α-FeOOH with various particle sizes, and have studied the change of the line shapes of the M?ssbauer spectra during the process of phase transformation. In our opinion, the asymmetric line shapes of the M?ssbauer spectra of α-FeOOH is mainly due to defective crystal structure.
AN EMPIRICAL CORRELATION BETWEEN SUPERCONDUCTING TRANSITION TEMPERATURES Tc AND THE HALL COEFFICIENTS IN AMORPHOUS SUPERCONDUCTORS
Authors: CAO XIAO-WEN  , LI YU-ZHI  , XIA JIAN-SHENG  , ZHANG YU-HENG  ,   (1)中国科学技术大学; (2)中国科学院等离子体物理研究所
Published: November 2020

It is found that there is an empirical correlation between the superconducting transition temperatures Tc and the Hall coefficients RH of amorphous states in numerous non-transition metals and alleys. The same correlation is also exist between the superconducting transition temperatures Tc of amorphous states and the Hall coefficients RHL, of corresponding liquid metals. Prom these empirical correlations we judge that disordered metals, including bismuth thalium zinc, lead and mercury, which have been reported up to now, remain to be not really amorphous.
A THEORY OF COHERENT PROPAGATION OF LIGHT WAVE IN SEMICONDUCTORS (Ⅱ)
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 second part of a theory of the coherent propagation of light wave in semiconductors. After considering the interaction between electrons, the problem of a semiconductor interacting with light is discussed and the equation of exciton polarization wave excited by light wave is obtained. We point out that the equation can be approximated by a set of linear ones and the exciton polarization wave can be regarded as a Bose field only in the limit of low excitation. In this paper, the problem of coherent excitation of discrete exciton level is also discussed specifically. It is shown that the discrete exciton level system excited coherently is approximately equivalent to a two-level atom system excited by light wave in which the difference of energy level is dependent on the degree of excitation and the density of equivalent "two-level atoms" is determined by features of the exciton state wave function.
THE SPECTROSCOPIC SPLITTING FACTORS OF THE (3d)1 TRANSITION-METAL IONS IN A TETRAGONALLY OR TRIGONALLY DISTORTED CUBIC CRYSTAL FIELD
Authors: MA DONG-PING  , XU YI-SUN  ,   成都农机学院
Published: November 2020

For the ions with a (3d)1 electron in a tetragonally or trigonally distorted cubic crystal field by taking the previous static crystal field theory as starting point, the Γ∥, Γ⊥ and K∥ K⊥, R∥ R⊥ are introduced further in terms of cluster model. E9 mixing into T29 is also considered. Then we derive the formulas of g∥ and g⊥ which can be used in all possible eases of tetragonally or trigonally distorted cubic crystal field.The variation of g∥ and g⊥ with the parameters has been discussed.A considerable peak appearing on the Δg-(d/λ0) curve has been discovered and further analysed.Bight EPE experimental results from literatures have been fitted and explained.
INSTABILITY OF THE LATTICE VIBRATION OF RELAXING SURFACES
Authors: ZHENG WEI-MOU  , WANG CHANG-HENG  ,   (1)中国科学院理论物理研究所; (2)中国科学院物理研究所
Published: November 2020

Starting from a simple model introduced by L. Pietronero et al., we have employed a programming scheme which can greatly simplify the calculation, and have completed the whole numerical evaluation. A method for the exact determination of τs and the specific calculation are given. Extending the results obtained we further discuss the variation of τs due to surface relaxation.
NEGATIVE MAGNETORESISTIVITY OF RAPIDLY QUENCHED SUPERCONDUCTING ALLOY AI-11.3 at% Si
Authors: GUAN WEI-YAN  , CHEN XI-SEN  , WANG ZU-LUN  , YI SUN-SHENG  ,   中国科学院物理研究所
Published: November 2020

The effect of heat treatment on the m icrostructure and super-conducting properties of the eutectic alloy A1-11.3 at% Si prepared by the splat quenching technique has been studied. The negative magnetoresistivity in super conducting-normal transition was observed in the sample after annealing at 100℃ for 50 hours. Our results reveal the existence of two superconducting phases in this sample.
INVESTIGATION OF THE PSEUDO-BINARY SYSTEM LilO3-Zn(IO3)2
Authors: TANG DI-SHENG  , FU ZHENG-MING  , LI WEN-XIU  ,   中国科学院物理研究所
Published: November 2020

The pseudo-binary system LiIO3-Zn(IO3)2 has been investigated and its phase diag-ram determined by means of X-ray diffraction and DTA, using specimens prepared by solid state powder sintering method. A new phase, the formula of which can be written as LiZn(IO3)3, has been found to exist in single phase within a wide range of composi-tions. It is an ionic conductor and has remarkable SHG effect as determined by the powder method. The lattice paremeters of the compound LiZn(IO3)3 have been determined by a computer programme, using the powder diffraction data. It is found that the compound belongs to orthorhombic system with a = 8.081?, b = 8.729?, c = 11.595?, z = 4.
ON ELECTROMAGNETIC INSTABILITIES OF PLASMA (II)
Authors: LU QUAN-KANG  ,   复旦大学
Published: November 2020

In paper [1], a strict and general instability criterion is obtained by analysing the geometric properties of the dispersion relation of electromagnetic waves in plasma with anisotropic velocity distribution, but the wave propagates only along one specific direction. In this paper, the propagation of electromagnetic waves along an arbitrary direction is discussed. The rigorous instability criterion is obtained.
DETERMINATION OF PENTAACETYLSARMENTOSIN CRYSTAL STRUCTURE
Authors: GU YUAN-XIN  , ZHENG CHAO-DE  , QIAN JIN-ZI  , 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

Pentaacetylsarmentosin is a derivative of Sarmentosin which is one of effective component of plant Sedum sarmentosum Bunge. The molecular formula is C21H27O12N. Pentaacetylsarmentosin crystals belongs to the orthogonal system, space group D24P212121. The cell dimensions are a = 19.756(3)?, 6 = 17.013(3)?, c = 7.482(1)?; four molecules are contained in a cell (z = 4). Intensity data were collected on a PW-1100 four circle diffractometer.The original MULTAN-78 was not successful in solving the structure, the correct structure solution was obtained by optimal selection method used to improve the index distribution of starting reflection set.Refinement of the structure paramenters was acheived by block-matrix Least-squares (program XTL (1974)), R = 0.051 (sin θ/λ≤ 0.48), R = 0.063 (all observed reflections). All the positions of hydrogen atoms except the methyes were located by the difference syntheses.
TIME REVERSAL SYMMETRY AND NON-EQUILIBRIUM STATISTICAL STATIONARY STATES (II)
Authors: ZHOU GUANG-ZHAO  , SU ZHAO-BIN  ,   中国科学院理论物理研究所
Published: November 2020

This is the 2nd part of our discussion on time reversal symmetry applied to the non-equilibrium statistical stationary states (NESS) from a microscopic quantum statistical point of view. With the application of the main results of I, a systematic investigation on the general properties of the NESS is given. For systems invariant under time reversal, the existence of a generalized potential and the fluctuation-dissipation theorem in the low frequency limit are established in the NESS. The Onsager's reciprocity relations for the local thermodynamical equilibrium systems are also generalized to that for the NESS invariant under time reversal symmetry. Finally, the time dependent 'Ginzburg-Landan equations for order parameters and conserved densities have been expressed in a general form with time irreversible and reversible parts similar to that met in the literatures studying critical dynamics.
DETERMINATION OF 3, 4-METHYLENEDIOXY-BENZOYL PICOLINE CRYSTAL STRUCTURE
Authors: QIAN JIN-ZI  , GU YUAN-XIN  , ZHENG CHAO-DE  , 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

3, 4-METHYLBNEDIOXY-BENZOYL PICOLINE crystal belongs to mono-clinic system. The space group is C2k5-P21/c with four formula units in a cell of dimension a = 10.381(2)?, b = 7.163(2)?, c = 16.951(3)?, β = 107.51 (5)°. The structure was solved by direct method (MULTAN-74). Eefinement of structure parameters was acheived by BLOCK-matrix least-squares method, R = 0.072 (for 2176 observed reflexions) .The intensity data were collected on PW-1100 four-circle diffractometer.All of the hydrogen atoms were located in the difference Fourier maps. The molecules are bound by the van der waals' force.
THE MECHANISM OF THE GRAIN GROWTH OF SUPERCONDUCTING COMPOUND Nb3Sn
Authors: WU ZI-QIN  , GAO QIAO-JUN  , TANG XIAN-DE  ,   (1)宝鸡有色金属研究所; (2)北京大学物理系
Published: November 2020

Grain growth of the Nb3Sn at the Nb/solid Cu-Sn and Nb/liquid Cu-Sn interface has been investigated. Experiments have revealed that the grain growth of the Nb3Sn at the solid/solid interface still conforms to the ordinary law of the grain growth in metals, though the Nb3Sn grain size (～0.1 μm) is much smaller than that of the metals. The Nb3Sn layer growth at the solid/liquid interface is divided into two layers: (1) near the Nb, the grains are fine and closely packed, (2) near the liquid Cu-Sn, the grains are coarse and dispersive. The coarse grains, are thought to be formed by a solution/deposition process. Most of the Nb3Sn crystals have the appearance of rhombic dodecahedron and orthogonal parallelepiped. It is evident that the interfacial energy of the {110} and {100} planes of the Nb3Sn crystal is lower than the others.
SOUND INTERACTION AMONG BUBBLES IN WATER
Authors: QIAN ZU-WEN  ,   中国科学院声学研究所
Published: November 2020

As well known, the measurements of the sound attenuation on a single bubble can be explained by thermal conductivity, viscousity and radiation losses. But when the measurements were made in a bubble screen, it will not be so simple. Since the theoretical loss is much less than the measured one, this problem is open until now.In this paper, taking the sound interaction among bubbles in water into account, a 90 phasor between the primary incident sound and the multi-scattering sound has been ob-tained. The latter is equivalent to a retard force acting on every bubble, and they suffer an additional damping.Comparing our theory with Carstensen and Foldy's experiments, a satisfactory agreement has been, found. In addition, we point out that the resonant frequencies of bubbles do not vary with the interaction among them, but the resonant curves will be widened. When the sound frequency is lower than the resonant frequency of a bubble, the mass which accompanies it will get an increase and the stiffness get a decrease. When the sound frequency is higher than its resonant frequency, the situation will be converse.
THEORETICAL DESIGN OF AN OPTICAL COORDINATE TRANSFORM SYSTEM
Authors: PAN SHAO-HUA  ,   中国科学院物理研究所
Published: November 2020

Using a diagrammatic computation method of the Wigner distribution function for geometric-optical systems, a 2-dimensional coordinate transform system is designed theoretically. The precision of this system may be better than that of the Bryngdahl co-ordnate transformer.
A STUDY ON THE ELECTRON STIMULATED INTERACTIONS OF RESIDUAL OXYGEN CONTAINING GASES WITH Ni (001) SURFACE
Authors: LI RI-SHENG  , REN DA-GANG  , XIE TEN-SHENG  ,   中国科学院金属研究所
Published: November 2020

When an electron beam bombards the residual oxygen-containing gases, such as H2O, CO2 and CO, these gaseous molecules will be dissociated as follows: H2O→Oad+H2,CO2→Oad+CO,CO→Oad+Cad, and the oxygen, and carbon atoms will coad-sorb on Ni(001) surface forming respectively many independent adsorption domains. The structure of them is either p(2×2) or c(2×2),depending upon the oxygen and carbon concentrations on the surface. The electron beam bombardment assists the nuclea-tion, growth, coalescence and ordering of these domains. When the oxygen and carbon atoms have occupied about one half of four-fold adsorption sites of the Ni(001) surface, the above- mentioned reactions will be in a state of equilibrium with following desorp-tion reactions: C*+Oad→CO,O*+Cad→CO, where * denotes the electron excited atoms, and the nickel oxide or carbide begins to nucleate. As the content of oxygen in the residual gases surpasses that of carbon, the nucleation of nickel oxide will be predominant. Once nickel oxide is growing, the desorp-tion reaction of carbon becomes effective and the already adsorbed carbon atoms will desorb or diffuse away and the oxygen concentration will increase quickly. As a consequence, the oxygen concentration inside the electron beam spots becomes much higher than that outside and the reverse is true for the carbon concentration. During the electron beam bombardment a change of carbon Auger peak shape, indicating diffrent bonding states between the carbon and substrate atoms, takes place. In the initial stage of adsorption the dissociative effect of an electron beam plays an important role, but during the growth of nickel oxide its thermal effect in enhancing diffusion becomes predominant.
THE CRYSTAL GROWTH OF BaB2O4 LOW TEMPERATURE PHASE AND THE STUDY OF PHASE DIAGRAMS OF RELATED SYSTEMS
Authors: HUANG QING-ZHEN  , LIANG JING-KUI  ,   (1)中国科学院福建物质结构研究所; (2)中国科学院物理研究所
Published: November 2020

The pseudo-binary systems BaB2O4-Na2O and BaB2O4-Na2B2O4 in the ternary system BaO-Na2O-B2O3 have been studied by means of thermal analysis and X-ray diffraction. The system BaB2O4-Na2B2O4 is a eutectic one and it's eutectic reaction occurs at 826 ±3℃. A new compound BaB2O4·Na2O which melts congruently at 846 ± 3℃ has been discovered in the BaB2O4-Na2O system. There exist eutectie horizontals from BaB2O4 to BaB2O4·Na2 at 755 ±3℃ and from BaB2O4·Na2O to Na2O at 573 ± 3℃. According to the obtained phase diagrams of the mentioned binary systems, the single crystals of BaB2O4 low temperature phase with dimensions of 2×4×6 mm3 and 2×4×8 mm3 have been grown by the Czochralski method from the melt containing 15 mol% Na2O or 13 mol% Na2B2O4 as flux.
THE PRINCIPLE OF ACCURATE MEASUREMENT OF THICKNESS OF COMPOUND THIN FILMS
Authors: LIN LI-BIN  , TIAN JING-WEN  , XIE JIAN-HUA  ,   四川大学物理系
Published: November 2020

In this paper, a method which can directly measure the thickness of compound thin films is given and the underlying principles are discussed. In the first approximation, the conclusion can be extended to the film with more layers. In order to increase the accuray of measurement, we obtained a more accurate equation and a set of data from electrinic computer. For the convenience of application, we set down all these data in the form of a handbook and express them with some diagrams.This direct method of measuring compound thin films on the substrate does not need any advanced equipment but only a ordinary ellipsometry. In principle, a PCSA optical system is to be used to solve the four-phase problem.
POINCARé GAUGE FIELD OF GRAVITATION AND THE MOTION OF SPIN 1/2 PARTICLE
Authors: LI GUANG-YI  ,   江苏师范学院
Published: November 2020

The Poincaré group is adapted as the gravitational gauge group. The equation of gravitational field in the Reimann-Cartan space-time with a Lagrangian containing linear and quadratic terms of strengths is investigated. For static and spherically symmetric field the vacuum solution in the macroscopic limit is shown to correspond to Schwar-zchild solution. Therefore this is in agreement with the experiments for general relativity. But in the microscopic limit, the field equation may predict a new type of short-range interaction.The spin 1/2 particle, Dirac particle, is taken as a probing particle. Its motion in the vacuum static and spherically symmetric gravitation field is explored. As a result, it is shown that the equation of motion of the Dirac particle only depends upon the Reimannian part of affine connection and has the same form as the corresponding equation of general relativity.
INTEGRALS OF PRODUCTS OF AIRY FUNCTIONS
Authors: WANG REN-CHUAN  ,   中国科学技术大学天体物理研究室
Published: November 2020

General methods of calculating indefinite integrals of the type ∫xnA(p)B(q)dx are pre-sented, where A and B are solutions of the Airy equition y" = (λ + x)y with the para-meterλ, p, q are the order of differential, n is a non-negative integer. General formulae of this type of integrals is given for corresponding p, q ≤1 and functions A, B with dif-ferent parameters. For A=B a method of integration is also obtained, which is quite dif-ferent from that of Albright. As an application, these formulae of integrals are applied to the problem of the orthonormalization of the wave functions of an electron in a triangular potential well, and the transition probabilities between the energy-levels are obtained.
AN ANALYTIC DERIVATION FOR THE MCMILLAN Tc FORMULA (I)——CASE OF μ*= 0
Authors: WU HANG-SHENG  , MAO DE-QIANG  , GU YI-MING  ,   中国科学技术大学
Published: November 2020

In the case of μ* = 0, the following Tc formula is derived analytically from the Eliashberg equation Tc=αωlogexp{-b((1+cλ)/λ)}, where, α = 2γ/π, b = c =1 and In γ = C = 0.5772 which is the Euler constant.The formula obtained by the authors holds only when Tc is less than 0.36/ α (K), where a is a constant larger than 1 and differs from one material to another. We conjecture, it is very likely that, when Tc is larger than 0.36/a, the functional structure of the Tc formula differs from that of McMillan's or at least the parameters a, b, and c are no longer constants independent of materials.
A PROPOSAL OF DOUBLE HETEROJUNCTION DOUBLE DRIFT-REGION InP/InGaAsP/InP AVALANCHE DIODE
Authors: YANG YU-FEN  ,   中国科学院半导体研究所
Published: November 2020

In this article, a double heterojunction double drift-region InP/InGaAsP/InP avalanche diode is proposed. The analysis manifests: the voltage madulation depth is 100% corresponding to efficiency of 64%. The small signal theory analysis of the device impedance is also given.
INFLUENCE OF IRRADIATION DAMAGE ON THE LINE SHAPES OF M6SSBAUER SPECTRA OF α-Fe2O3
Authors: DU YOU-WEI  , HU NAI-XIONG  , LU HUAI-XIAN  , ZHANG YU-CHANG  , GU XIU-SHI  ,   南京大学物理系
Published: November 2020

We have investigated the influence of lattice defects caused by ion implantation on the line shapes of M?ssbauer spectra.
THE CHARACTERISTIC X-RAY INTENSITY FACTORS OF THE PURE ELEMENT BULK SAMPLES
Authors: CAI WEI  , GE SEN-LIN  , WU ZI-QIN  ,   北京大学物理系
Published: November 2020

The K-series X-ray intensities of eight pure elements (from Al to Ge) and the L-series X-ray intensities of four pure elements (from Ni to Ge) excited by 15-30 keV electrons have been measured. Using the modified and simplified "full diffusion" electron diffusion model the ratios of the characteristic X-ray intensities) of these pure elements have been calculated. The back scattering effect is included in this model itself and the absorption correction factors are obtained from the stepped intensity-depth distribution derived from this model. Moreover the continuum fluorescence effect is also considered. The calculated values are in agreement with the experimental data, therefore the reliability of the model is verified.
A SCHEME TO CONTROL THE FIRST-SECOND CYCLE AMPLITUDE RATIO OF TRANSDUCERS FOR ULTRASONIC MEASUREMENTS
Authors: YING CHONG-FU  , LI MING-XIAN  , ZHONG GAO-QI  , LIU XIAN-DUO  , YANG YU-RUI  ,   中国科学院声学研究所
Published: November 2020

In the ultrasonic applications of measuring non-acoustic characteristics, it is impor-tant that the time of flight of the ultrasound be measured with accuracy. One significant step to achieve this is to ensure that the first few cycles of the received ultrasonic signal should not be missed. This in turns asks for the amplitude of the first cycle being as large as, or greater than, that of the second. By studying the transient responses of the transmitting and receiving transducers, either separated or two united in one, it is shown that the first second cycle amplitude ratio can be increased from less than one to one or more of the specific acoustic resistance of the transducer backing is enhanced to a suf-ficiently high value, but not necessarily as high as the specific acoustic resistance of the piezoelectric plate. This holds for the case of light loading. For the case of heavy load-ing, the amplitude ratio is found to be inherently large.
EFFECT OF THE CIRCUMSTANCE RADIATION ON THE MEASUREMENT OF THE TARGET THERMAL RADIATION PROPERTIES
Authors: ZHANG CAI-GEN  , ZHANG YOU-WEN  ,   (1)上海交通大学物理系; (2)中国科学院上海技术物理研究所
Published: November 2020

As the total circumstance radiation which falls on the target being taken as the equivalent radiation of a blackbody at temperature T0, the effect of environment radiation change on the sensibility equation of thermal imaging system is studied, and consequently the ratio emissivity ε of the target can be determined theoretically through the change of environment radiation. This paper gives the method and the measurements of temperature of the environment equivalent blackbody T0 Also a new method is given about the thermometer measurement of the ratio emissivity of the target. When the environment radiation is not neglected, the problems are methodically and theoretically discussed about how to use a ratio radiometer to measure the real temperature T of the target and how to use the radiometer to measure the spectral reflectivity of visible light from ground target.
NEAR RESONANT SCATTERING OF COLLISION PERTURBED ATOMS WITH DOUBLET EXCITED STATES
Authors: ZHANG YI-XIANG  , HAN QUAN-SHENG  , LUO ZHENG-JI  , CHENG WEN-QIN  ,   中国科学院物理研究所
Published: November 2020

We investigated the near resonant scattering and collision induced fluorescence of sodium atoms with doublet excited states in a weak laser field. By changing the frequency of the incident light and measuring the integral intensities of the components of the scattered light, the near resonant excitation cross-section of each sublevel was obtained as functions of the frequency detuning. Their variations are qualitatively explained by the interaction potential between the sodium atom and various collisional perturbing species. We have measured the variation of the induced D1 and D2 fluorescence with laser power, density of sodium atoms and pressure of buffer gas. It is shown that the relation is linear. The experimental results are in agreement with the theory.
ON THE GAUGE TRANSFORMATION OF THE TENSOR POTENTIALS FOR THE FIELD OF MOVING DISLOCATIONS
Authors: OU FA  ,   哈尔滨工业大学物理教研室
Published: November 2020

The problem on gauge transformation of the tensor potentials (A and B) associated with the dislocation field is treated. It is shown that the expressions of this transformation may take the form B′=B+▽F, A′=A-ρ?/(?t)▽G,x′=x-ρ?/(?t)F, where xi=eiklAkl. F and G are some arbitrary vector functions of position and time, but they must satisfy the relations F=▽×G,▽2F-1/Gt2-(?2/?t2)F=0. Furthermore, it is proved that the gauge conditions presented in [1] are compatible with the inhomogeneous wave equations for A and B
A ROOM TEMPERATURE SECTION OF THE PHASE DIAGRAM OF TiAl3-VAl3-MAl3 OF THE QUATERNARY SYSTEM ALLOYS OF Al-Ti-V-M (M = Ni, Fe)
Authors: ZHUANG YING-HONG  , LIU JING-QI  , ZHENG JIAN-XUAN  ,   广西大学
Published: November 2020

The TiAl-VAL-MAl3 sections of the Al-Ti-V-M (M = Ni, Fe) systems at room temperature have been determined by X-ray diffraction method. (1) The TiAl3-VAl3-NiAl3 pseudoternary system is composed of the e(NiAl3) phase region, d phase region (the d phase is a continuous series of solid solutions formed from the compound TiAl3 with the compound VA13), and ε+δ two-phase region. (2) The TiAl3-VAl3-FeAl3 pseudoternary system is composed of the θ(FeAl3) phase region, δ phase region (the phase is the same as in the TiAl3-VAl3-NiAl3 system), and θ+δ two-phase region. No new phase has been found other then those already encountered in the four corresponding binary systems and the three corresponding ternary systems.
THE ELECTRONIC STRUCTURE OF METAL-SEMICONDUCTOR LUCS
Authors: LIU MEI  , CAI JIAN-HUA  ,   南京大学固体物理研究所
Published: November 2020

The excitonic superconductor proposed by Allender, Bray and Bardeen is a kind of Layered Ultrathin Coherent Structure (LUCS) composed of metal and semiconductor layers. In a previous work, we have studied the electronic structure of a metalme-tal LUCS in the tight binding approximation. We present here the result of a similar study of a metal-semiconductor LUCS, with the hope that it may be helpful to more detailed further investigations of the ABB model of superconductivity.
THE STRUCTURE AND STABILITY OF THE RELATIVISTIC POLYTROPES WITH A COMPACT CORE
Authors: FANG LI-ZHI  , XIANG SHOU-PING  ,   中国科学技术大学天体物理研究室
Published: November 2020

The objects with core (or with halo) are typical configuration in various astrophy-sical problems. The equilibrium and stability of the relativistic polytropes with a compact core have been discussed in this paper. Comparing with the normal polytropes, the relativistic loaded polytropes have many unique properties, some primary ones are:1. The distribution of density has a steep spike near the centre.2. The stable solution of polytropes with finite radius may exist only when the core satisfy some restricted conditions.3. When the polytropic index n≥3, the stable solution of equilibrium can also exist.
INSTABILITIES EXCITED BY HEAD-ON COLLISIONS OF TWO RELATIVISTIC ELECTRON BEAMS
Authors: GUO SHU-YING  ,   中国西南物理研究所
Published: November 2020

In this paper, we studied the instabilities excited by head-on collision of two rela-tivistic electron beams in transporting, taking account of the magnetic field B0 and the thermal pressure ▽p of the beams. The conditions under which the instabilities occur and the growth rate of instabilities are obtained. The results show that these instabilities can be excited or inhibited by controlling the velocity of the beams.
TRANSFORMATION CHARACTERISTICS OF SPIN WAVE FUNCTION OF A NUCLEUS UNDER SELECTIVE IRRADIATION
Authors: ZHU XI-WEN  , YE CHAO-HUI  ,   中国科学院武汉物理研究所
Published: November 2020

The transformation characteristics of the probability amplitude corresponding to an arbitrary sublevel system of a nucleus is studied. The nucleus, with arbitrary spin, is placed in a magnetic and an electrostatic field and irradiated selectively. The possible physical implication of the above mentioned transformation characteristics is discussed. The differences between the two characteristics, i.e., the 2π or 4π symmetry of the wave functions under space rotation and the 2π or 4π periodicity of the probability amplitude corresponding to a sublevel system under selective irradiation are explained.
SINGLE-DELAY MEASUREMENT OF ULTRASHORT LIGHT PULSES BY THIRD ORDER INTENSITY CORRELATION
Authors: ZHANG ZHAO-YUAN  , QU LIN-JIE  , LIU CHENG-HUI  , HUO CHONG-RU  ,   (1)天津大学; (2)中国科学院物理研究所
Published: November 2020

The asymmetry of ultrashort light pulse may be detected by third order intensity correlation. As compared with the results of SHG method, more information may be obtained about the shape of the pulse. According to our measurement, the shape of the pulse of passively mode-locked Nd: YAG Laser can be considered approximately as Gaussian-exponential. The correlation width obtained by third order intensity correlation was 22.3 ps+15.7 ps, its corresponding pulse width was about 27ps. The leading edge of the pulse was steeper than the trailing edge.
ABSORPTION AND RELAXATION TIME OF THE CHINESE DYES D1 AND D2
Authors: QIU PEI-HUA  , B. KOPAINSKT  ,   慕尼黑技术大学物理系慕尼黑,西德
Published: November 2020

In this paper, we report on the measurement of the absorption and the relaxation time of the Chinese fast saturable absorbers D1 and D2 used for mode-locking Nd-doped laser material.
SPECTROSCOPY OF HIGH ORDER CARS AND CSRS
Authors: LIU SONG-HAO  , WANG FU-GUI  , YU BING-KUN  , LIU MIN  , CHEN YI-SHEN  , ZHOU FU-XIN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

We report here the experimental results of high order coherent Raman spectra (CRS) in the ealcite using a YAG laser CARS system. CARS spectra from the 1st to the 6th order and coherent Stokes Raman spectra (CSRS) from the 1st to the 2nd order and the backward CARS spectra were observed. Factors affecting the high order CRS and related problems are considered.
THE SURFACE OR INTERFACE WEAK COUPLING POLARON IN POLAR CRYSTALS
Authors: PAN JIN-SHENG  ,   中国科学院长春物理研究所
Published: November 2020

In this paper, we show that a simple variational method proposed by Huybrechts is also valid for the surface or interface weak coupling polaron in polar crystals. The mass change and the binding energy of the surface polaron, which are given by expressions (27) and (35) in the text respectively, are dependent on the dielectric costant ε0, ε∞1,ε∞2 and the Fr?hlich coupling constant α. It is shown that the surface polaron, as compared to bulk polaron, have small binding energy and large state radius.
BISTABLE CHARACTERISTICS OF HYBRID NONLINEAR FABRY-PEROT OPTICAL BISTABILITY
Authors: LI YONG-GUI  , ZHANG HONG-JUN  , YANG JUN-HUI  , GAO CUN-XIU  ,   中国科学院物理研究所
Published: November 2020

In this paper, we describe a hybrid nonlinear P-P Bistable Optical Device (BOD), the length of its cavity is controllable. The dynamic equations of the system and the equilibrium splution which shows the optical bistable nature are given. The bis-tability and linear modulation characteristics are discussed. The stability of the equilibrium state and the "critical slowing down" effect of transient behavior are analysed. The experimental demonstrations are in agreement with the theoretical evaluations.
A TIGHT-BINDING CALCULATION OF ELECTRONIC STATES OF LAYERED ULTRA-THIN COHERENT STRUCTURES
Authors: XIONG SHI-JIE  , CAI JIAN-HUA  ,   南京大学固体物理研究所
Published: November 2020

The present article gives an account of a calculation of the sub-band structure and atomic plane projected electronic local densities of states of a simplified model of the newly appeared synthetic materials, Layered Ultra-thin Coherent Structures (LUCS), by means of the Green's function method in the tight-binding approximation including the nearest neighbor matrix elements only. A formulation of a more accurate method for the same purpose in terms of linear combinations of muffin-tin orbitals and interface plane wave orbitals is given in the appendix.
THE CRYSTAL STRUCTURE AND MOLECULAR ABSOLUTE CONFIGURATION OF KOUMINE HYDROBROMIDE
Authors: RAO ZI-HE  , WAN ZHU-LI  , LIANG DONG-CAI  ,   中国科学院生物物理研究所
Published: November 2020

The crystal structure of alkaloide, koumine Hydrobromide (C20H22N2O·HBr), has been solved by Patterson and Fourier methods and refined to an R value of 0.067 by full-matrix least-square method. The crystal belongs to orthorhombic system with the unit cell parameters: a = 14.307?, b = 12.053?, c = 9.862?; and four molecules are contained in the cell. The space group is P21 21 21. The positions of all hydrogen acoms have been found from a difference Fourier map calculated after the refinement of co-ordinates of all non-hydrogen atoms with anisotropic thermal parameters by least-squares method. The absolute configuration of the molecule has been established. The structural characteristics of the molecule were discussed.
ON THE RELATIVISTIC ABERRATION THEORY OF A COMBINED FOCUSING-DEFLECTION SYSTEM WITH MULTI-STAGE DEFLECTORS
Authors: LI YU  , XIMEN JI-YE  ,   (1)北京大学; (2)上海机械学院
Published: November 2020

In the present paper, the relativistic first order chromatic and third order geometrical aberration formulas, which are different from those in ref. [1], have been derived for a combined focusing-deflection system with superimposed field, and all aberration coefficients have been given in explicit form. With the help of these aberration formulas, the deflection aberrations of a combined system with multi-stage deflectors have been discussed in detail.
INTERGROWTH AND DISORDER STACKING IN THE CRYSTAL STRUCTURE OF ALKALINE-EARTH-CERIUM FLUOROCARBONATE MINERALS
Authors: FAN HAN-JIE  , LI FANG-HUA  ,   中国科学院物理研究所
Published: November 2020

The cerium fluorocarbonate minerals containing both calcium and barium have been studied by the lattice imaging technique. It has been found that the crystal structure of such minerals are formed by stacking at random along the direction c layers of various barium-Cerium as well as calcium-cerium fluorocarbonate minerals. The inter-growth of some calcium-cerium fluorocarbonate minerals with different composition has been observed in the range of several angstrons. A possible new polytype in Roentgenite has been proposed. The results show the advantage of the lattice imaging technique in direct observation of the crystal structure of such minerals.
THE CRYSTAL STRUCTURE OF 15-CROWN-5 NITRATE PRASEODYMIUM
Authors: LIN YONG-HUA  , XING YAN  , JIN SONG-CHUN  ,   中国科学院长春应用化学研究所
Published: November 2020

The crystal of 15-crown-5 nitrate praseodymium with composition Pr(NO3)3C10H20O5 belongs to monoclinic system. The space group is C2h5-P21/α with lattice parameters α = 13.622?, b = 14.599?, c = 9.336?, β = 95°20′ and 4 molecules in the unit cell. The intensities of 2853 independent reflection were collected by the PW-1100 four-circle diffractometer. The structure was solved by heavy-atom method and refined to a final R = 0.080 by block diagonal least square method. The praseodymium coordination comprises the five crown oxygens (Pr-Ocrown= 2.545?) and two oxygens from each of the three bidentate nitrates (Pr-O(NO3-)= 2.685?). The coordination number is eleven.
STUDY OF IONIC CONDUCTANCE OF FAST IONIC CONDUCTOR Rb4Cu16I7Cl13 UNDER HYDROSTATIC PRESSURE
Authors: XUE RONG-JIAN  , YAO YU-SHU  , ZHAO ZONG-YUAN  , CHEN LI-QUAN  ,   中国科学院物理研究所
Published: November 2020

The ionic conductances of polycrystalline Rb4Cu16I7Cl13 for both porous and dense specimens have been measured between - 80-8°C under hydrostatic pressure from 0.5 to 11.6 kbar. A conductance maximum exists near 4-5 kbar on conductance versus pressure curve for porous specimens, while the conductance decreases with pressure for dense specimen. The temperature dependence of conductance under constant high pressure is the same as that under atmospheric pressure. The pressure does not obviously influence the a →β phase transition temperature. The activation volumes are 0.90 cm3/mol and 1.55 cm3/mol for α and β phase respectively.
THE CRYSTAL STRUCTURE OF METHOXY-FORMYL-TRICHLOROACETYL-METHYLENE-PHOSPHORUS (YLID-IV)
Authors: HE CUN-HENG  , ZHENG QI-TAI  , SHEN FU-LING  , DOU SHI-QI  , LIN GUANG-DA  ,   (1)中国科学院生物化学研究所; (2)中国科学院生物物理研究所; (3)中国医学科学院基础医学研究所
Published: November 2020

The YLID-IV (C22H18O3PCl3) crystal belongs to the monoclinic system with space group P21/n and unit cell parameter α = 13.518(6)?, b = 14.923(7)?, c = 11.473(5)?, β = 99.81(2), z = 4. The intensity data were collected on the Philips PW-1100 diffrac-tometer. The structure was determined by direct method (MULTAN-78) and refined by full-matrix least-squares method to a final R value of 0.074 for 2592 reflexions. The hydrogen atom locations were determined by difference Fourier synthesis.