bluuebunny/crossref_metadata_2025 huggingface dataset:
MUTUAL EFFECT ON PHASE TRANSITION TEMPERATURES OF TWO PHASES IN AgI(α-Fe2O3) COMPOSITION ELECTROLYTES
Authors: Zhao Zong-yuan  , Chen Li-quan  ,   中国科学院物理研究所
Published: November 2020

DC and ac conductivities of AgI(α-Fe2O3) composite electrolytes have been measured. It is found that the Morin transition temperature of α-Fe2O3 is dereased by the addition of AgI. The results of M?ssbauer spectra and susceptibility are qualitatively coincide with electrical measurement. Phase transition temperature of AgI from α to βphase is also significantly lowered by the existance of α-Fe2O3. The experiments have been shown that phase transition temperature of the two phases in composite electrolyte were influenced each other.
ON THE ABERRATION THEORY FOR WIDE AND NARROW ELECTRON BEAMS IN A COMBINED ELECTROMAGNETIC FOCUSING SPHERICAL CATHODE LENS SYSTEM
Authors: Ai Ke-cong  , Zhou Li-wei  , Ximen Ji-ye  ,   (1)北京大学; (2)北京工业学院; (3)西安应用光学研究所
Published: November 2020

In the present study, an aberration theory for both wide and narrow electron beams in a combined electromagnetic focusing spherical cathode lens system is discussed. The general formulae of aberration coefficients for first and third order transversal geometrical and chromatic aberrations on any ideal image plane have been derived under following conditions, i.e., when the objective and image fields have finite curvatures and when the cathode is immersed in magnetic and transversal electric fields. Based on the variational analysis method and the trajectory calculation method, the relationship between the wide electron beam slstem and the narrow electron beam system has been considered in detail. It has been shown that these two different electron beam systems can be treated equally and their aberration equations and coefficients can be expressed in a universal form, if one considers the definite energy and angular initial distributions and utilizes the first order linear trajectory equation. In the present paper, electron frajectories are described in the vector form. The aberrations are expressed in the matrix form and are thus appropariate for computer calculations.
STUDY OF VALENCE-BAND PROPERTIES IN a-Si1-xCx:H BY UV PHOTO-ELECTRON SPECTROSOPY
Authors: Zhang Fang-qing  , Xu Xi-xiang  , Chen Guang-hua  , Jiang Zhi-chen  , Chen Zhen-shi  , Qi Shang-kui  ,   (1)兰州大学物理系; (2)中国科学院兰州化学物理研究所
Published: November 2020

We studied the valence-band (VB) spectra of hydfogenated amorphous silieon-earbon alloy film (a-Si C:H:) by means of UPS technique and analysed the influence of doping and surface oxidation on VB spectra. Accompanied with XPS and AES analysis, we preliminarily investigated the distribution and bonding property of valence electrons in the alloy films.
JET CHARGE CROSS SECTION METHOD
Authors: DU DONG-SHENG  , YANG XIN-E  , LUO MA  ,   (1)高能物理研究所; (2)南开大学物理系; (3)天津大学物理系
Published: November 2020

We propose in this paper a seheme ealled Jet Charge Gross Section Method. In this method, the results of ealculations in pertubative QCD a.re not only less affected by the sea quark and gluon distribution functions in hadrons, just like in the calculations of cross section difference of hadrons: dσ(AB→h+X)-dσ(AB→h-X), but also independent of any fragmentation functions of partons. Furthermore, it is possible to measure the mean electric charges of various quark jets indirectly without distinguishing the quark flavors.
ELECTRONIC STRUCTURE AND DEFECT SPECTROSCOPY OF POINT DEFECTS IN METALS
Authors: GU BING-LIN  , LOU YONG-MING  , GAO NAI-FEI  , XIONG JIA-JIONG  ,   清华大学物理系
Published: November 2020

The electronic structures and positron annihilation lifetimes for vacancy-like defects, H-impurity and vacancy-H, vacancy-He complex in the transition metals Cr, Fe, Ni and the noble metal Cu have been calculated, using the density functional formalism and local density approximation based on the jellium model. It is shown that positron lifetime studies can produce fingerprint speetroscopy of defect of various sizes and structures in metals.
MAXIMUM ENTROPY METHOD IN STRUCTURAL ANALYSIS
Authors: WEI WEN-DO  ,   中国科学院金属研究所
Published: November 2020

Information theory provides a constructive criterion for setting up probability distributions on the basis of partial knowledge, and leads to a type of statistical inference which is called the maximumentropy estimate. It is the least biased estimate possible on the given information, i.e., it is maximally noncommittal with regard to missing information.The principle of maximum entropy, which has proven useful in other contexts, is adopted here to design a procedure for obtaining structural information from an incomplete set of diffraction data. A comparison is made between the proposed procedure and the conventional Fourier inversion method used in RDF analysis of non-crystalline materials. The maximum-entropy method is found to have a higher resolution and also the advantage of no adjustable parameters with a high degree of reliability.This method is iterative and uses more computer time than direct techniques; however, a number of comparative examples indicate that a significant improvement on the resultant structure in quality and resolution is possible with only a few iterations.
INELASTIC NEUTRON SCATTERING STUDY ON ACOUSTICAL ACTIVITY OF Bi12GeO20 AND Bi12SiO20
Authors: TAO FANG  , ZHANG TAI-YONG  , NIU SHI-WEN  , GOU CHENG  , SHI ZHONG-JIAN  , LIN QUAN  ,   (1)中国科学技术大学物理系; (2)中国科学院声学研究所; (3)中国科学院物理研究所; (4)中国科学院原子能研究所
Published: November 2020

Acoustical activity of isomorphous crystals Bi12GeO20 and Bi12SiO20 has been studied by measuring the splitting of degeneracy of transverse acoustical waves propagating along high symmetric direction with inelastic neutron scattering. One of the interesting results is that the left and right circularly polarized modes of acoustical phonons propagating along direction are subjected to different attenuation. This conclusion is verified by both kinds of crystals. The experimental result is observed for the first time in the study of acoustical activity. The life-time of the phonon with larger attenuation is found to be about 2×10-11 s. experimentally.
COMPUTER-GENERATED HOLOGRAM FOR ELLIPTICAL GAUSSIAN WAVEFRONT CORRECTION
Authors: C. S. IH  , WANG YONG-ZHAO  , WU JI-ZONG  , XIANG LIAN-QIN  ,   (1)美国特拉华大学电机系; (2)天津大学精密仪器系
Published: November 2020

Computer-generated hologram for elliptical gaussian beam correction lias been investigated, detail mathematical equations of calculating hologram phase difference arc derived. The holograms which are drawn by a computer-driven plotter are given. The holographic optical elements are obtained from CGH. The experiment result to demonstrate the correct calculation is also shown in this paper.
TIME-RESOLVED SPECTRA STUDIES OF ArF* AND Ar2F* EXCIMERS UNDER FAST-DISCHARGE EXCITATION
Authors: GU ZHI-YU  , WANG SHAO-YING  , LEI JIE  , CAI XIAO-HONG  , WANG YONG  , YUAN DA-CHANG  ,   中国科学院安徽光学精密机械研究所
Published: November 2020

The formation and quenching kinetics of ArF* and Ar2F* have been studied by ive-stigating their timeresolved spectra. Analysis shows that the decay process of ArF* depands on the time evolution of it's main precursor Ar*, but that of Ar2F* is determined by its own effective lifetime. Thereby the two-body quenching rate constant of Ar* by F2, three-body quenching rate constant of Ar* by Ar, as well as two-body quenching rate constant of Ar2F* by He, Ar and F2, and the radiative lifetime of Ar2F* are determined.
A MOSSBAUER STUDY FOR THE Eu2O3 DISPERSITY ON THE SUPPORT SURFACE
Authors: LIU RONG-CHUAN  , XIA YUAN-FU  , WANG SHU-XIN  , LI YU-KUI  , YAN QI-JIE  , CHEN YI  , LIU HAI-YANG  ,   (1)南京大学化学系; (2)南京大学物理系; (3)南京大学物理系,南京邮电学院计算中心
Published: November 2020

M?ssbauer spectroseopy has been used to study the dispersity of Eu2O3 on the surface of different supports. Changes in M?ssbauer parameters as a function of the europium content reveal the difference of the interaction between Bu2O3 and the support. On the surface of γ-Al2O3, the M?ssbauer isome shift progressively increases toward to that of bulk Eu2O3 with increasing metal loading, suggesting that the crystal phase of Eu2O3 forms gradually. In contrast, on the surfaces of two types of SiO2 the isomer shifts do not change with changing the metal loading in the range of our study. This suggests that Eus03 tends to spread out on the surface as a second layer over monola-yer dispersion. The conclusion obtained by M?ssbauer spectroseopy is in agreement with that obtained by X-ray diffraction
CONVERGENT-BEAM ELECTRON DIFFRACTION STUDY OF TRANSVERSE BASAL STACKING FAULTS IN LAYER STRUCTURES
Authors: FENG GUO-GUANG  ,   中国科学院物理研究所
Published: November 2020

Convergent-beam electron diffraction zone-axis patterns have been obtained from transverse basal stacking faults in graphite and molybdenite. These patterns show a reduced symmetry and split reflections. The splitting and unsplitting of the reflections correspond to the visibility and invisibility of the stacking faults in the theory of diffraction contrast of imperfect crystals. This analysis can be extended to zone-axis patterns obtained from other crystal defects.
ON THE RENORMALIZED DISPERSION EQUATION OF TURBULENT PLASMA
Authors: ZHANG CHENG-FU  ,   北京大学物理系
Published: November 2020

Starting from the kinetic equation in the K space, which is the Fourier space of velocity V and using the technique of operator calculation and transformation, the re-normalized dispersion equation of turbulent plasma has been deriv ed rather simply. The effect of finite correlation time of the turbulence has been calculated under the approximation of assuming a turbulence with effective correlation time τeff instead of the one with time and space correlation. It shows that the effect of finite τeff will reduce the effect of turbulence. Therefore, the expression obtained in the limiting case of short eorrelation time is the upper bound of the turbulence effect. The effects of turbulence on the ion sounds, electron langmuir waves and drift waves have also been discussed.
DENSITY PROFILE STEEPENING DUE TO LASER RADIATION IN A MAGNETIZED INHOMOGENEOUS PLASMA
Authors: XU ZHI-ZHAN  , YU JIAN  , TANG YONG-HONG  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The effects of self-generated magnetic field on the density profile modification in laserplasma interactions are studied by calculating the field structure, assuming that plane electromagnetic waves propagate into an one-dimensional inhomogeneous magnetized plasma. The results obtained by computation are in agreement not only with the laser-target experiments using Nd-glass laser, but also with that using CO2 laser. In addition, calculations show naturally the density dip which has been observed in experiments.
A MECHANISM OF RESISTIVITY MINIMA IN Au1-x Nix ALLOYS (x = 0.30-0.42)
Authors: YU MEI  , LIU FU-SUI  , H. L. LUO  ,   (1)Department of Electrical Engineering and Computer Sciences,University of California,San Diego,USA; (2)北京大学物理系
Published: November 2020

In order to explain the experimental results of resistivity minima in Au1-xNix alloys (x=0.30-0.42) at low temperature, we propose a model of the alloy with dilute spin clusters in the paramagnetic state based on the s-d interaction. The resistivity contribution from the electron scattering by isolate spin clusters and by spin clusters with a ferromagnetic RKKY interaction are considered. Combining with the phonon contribution, derived from the experimental data of ρi(T) of Au-Cu or Au80Ni20 alloy, we obtain a resistivity minimum. The calculated total resistivity ρ(T) is in good agreement with the experimental result. It is shown that a decrease in ρ with increasing temperature below Tmin is mainly attributed to the Kondo effect caused by isolate spin clusters. The electron scattering from coupled spin cluster pairs gives a much smaller contribution to the resistivity, which exhibits a T-1 temperature-dependence and decreases rapidly with increasing temperature. So the experimental relults of ρ(T)-ρi(T) in Au1-xNix alloys (x=0.30-0.42) show a log T temperature-dependence over a wide tempera-ture range.
A HYPERFINE INTERACTION STUDY ON Sn NUCLEI IN SmCo3.66Fe0.13Sn0.06 PERMANENT MAGNETS
Authors: ZHAO JI-WAN  , XIA YUAN-FU  , LIU RONG-CHUAN  , WANG GUI-QIN  , Lü LI-YA  , WANG KUN-MING  , HUA WEN-BIAO  ,   南京大学物理系
Published: November 2020

The 119Sn M?ssbauer spectra of SmCo3.66Fe0.13Sn0.06 PM sintering slices have been studied by M?ssbauer spectoscopy. At tin nuclei, near zero magnetic splitting was observed. It was concluded that the majority of additive tin and iron whose atomic ratio is not less than 2:1 entered into the lattice of SmCo5 homogeneously and the iron-tin neighbour developed an ordered structure. The principal characteristic constituents is similar to FeSn2. The effect of coercive force of these atomic configuration and possibly emerging spin configuration is discussed.
PRIMORDIAL BLACK HOLE FORMATION IN INFLATIONARY PHASE
Authors: LIU LIAO  ,   北京师范大学物理系
Published: November 2020

In the inflationary phase of our universe, the true vacuum bubbles, appearing during the non-homogeneous phase transition, may collapse into primordial black holes. The lowest mass limit of them is 104g, and they may accompanied by t'Hooft-polyakov rno-nopoles. This result may have certain observational significance as compared with that of Carr, Hwaking and Wu.
INTERNAL FRICTION OF Ag-Cd ALLOY IN THE BAINITIC TRANSFORMATION
Authors: ZHANG JI-HUA  , CHEN SHU-CHUAN  , XU ZU-YAO  ,   上海交通大学
Published: November 2020

The isothermal internal friction of a Ag-42.3% Cd alloy has been measured by means of a low frequency inverted torsion pendulum apparatus between room temperature and 250℃. The relation between Q-1 and temperature with various heating and cooling rate were determined. Experimental results show that as the bainitic transformation occurs, the Q-1 of Ag-Cd alloy increases rapidly. It may be postulated that there are regions of instability of the parent lattice in the course of nucleation process for the bainitic transformation. The increment of Q-1s is a function of the product of internal friction of the fraction of the lattice localized soft region per volume and the nuclea-tion rate J* of the bainite.
CONTINUOUS TIME RANDOM WALKS ON RANDOM LATTICES WITH TRAPS
Authors: WEN CHAO  , LIU FU-SUI  ,   (1)北方交通大学应用数理系; (2)北京大学物理系
Published: November 2020

Random walks on random lattices with traps is treated by continuous time random walk (CTRW) method. The equation of walker's survival probability P(t) is obtained in the general case that the walker can decay spontaneously and is able to escape from the well after trapping. In the case of deep traps, the series solution for all time and arbitrary trap concentration with the waiting time distrubution density ψ(t) = ααt-(1-α) exp(-ata), 0 <α≤ 1, is given. Recognizing the experimental facts and Ngai's low energy excitations theory, we point out the importance of dynamic coupling. To describe this dynamic coupling, a theory of CTRW on real random lattices is proposed. In this approach the physical picture is completely different from the curresnt CTRW theory.
THE TWO WINDOW FOURIER TRANSFORM TECHNIQUE AND ITS APPLICATION IN THE SPECTRUM ANALYSIS OF QUANTUM OSCILLATIONS
Authors: HE YU-SHENG  ,   清华大学物理系
Published: November 2020

The conventional Fourier transform methods were found to give an inadequately accurae and complete spectrum of the quantum oscillation frequencies for some materials with complicated Fermi surface such as IV-VI compounds in the distorted phase. Because of this problem, the early de Haas-van Alphen data of SnTe could not be interpreted properly. The ‘two window Fourier transform'technique was developed, and it solved this problem successfully in the Fermi surface measurements of Pb1-xSnxTe and SnTe. In this technique, the spectrum analysis are performed twice for each set of data by using two different windows, refered as ‘strong window' and ‘weak window' respectively, so as to increase the signal to noice ratio and to detect components with weaker strength and to resolve neighbouring components of similar strength. Hence higher detectability and resolvability and better accuracy can be achieved. The analysis results of the pseudo-SdH simulation signal, consisting of 10 components with different amplitude, show that the error in frequency of the spectrum is less than 1%.
TEMPORAL AND SPECTRAL FEATURE OF THE 3(ω0)/2 SPATIALLY FINE STRUCTURES IN LASER IRRADIATED PLANAR TARGETS
Authors: LIN ZUN-QI  , TAN WEI-HAN  , GU MIN  , MEI GUANG  , PAN CHENG-MING  , YU WEN-YAN  , DENG XI-MING  ,   中国科学院上海光学精密机械研究所
Published: November 2020

Both temporally and Spectrally resolved fine structures of 90° lateral 3/2ω0 harmo-nic emission were experimentally observed. The existence of 3/2ω0 harmonic filaments isattributed to the 3/2ω0 harmonic radiation emitted from neighborhood of the bottom ofmoving filament, about nc/4 away from it. The double hump structure with intensered hump of laterally emitted 3/2ω0 spectrum can also be explained by Doppler correc-tion besides the thermal correction due to fast moving TPD process occuring in the unstable filaments. Estimation of both red and blue shifts using our simple model is wellconsistent with experimental results. Experiments showed that the 3/2ω0 emission wasobviously suppressed by using broad band laser owing to more uniform illumination on the target surface and broad band effect. These may be promissing for superhot electron suppression.
STUDIES OF FOURIER-TRANSFORM ANALYSIS METHOD FOR ENERGY-DEPENDENT PHOTOELECTRON DIFFRACTION (II)——THE SYSTEMS OF Se-Ni (111) AND S-Ni(111)
Authors: FENG KE-AN  , HUANG YI  , TANG JING-CHANG  ,   (1)浙江大学; (2)中国科学院物理研究所
Published: November 2020

Direct Fourier-transform analysis method for energy-dependent photoelectron-dif-fraction curves of P(2×2) and (31/2×31/2) Se or S on Ni(lll) system has been studied. From calculations for different adsorption sites and different beams, their influence on Fourier peak positions and related layer spacing modification values △n has been analysed and their relation to atom spacing discussed in some detail.
EFFECT OF COBALT COATING ON THE MORIN TRANSITION OF α-Fe2O3
Authors: LUO HE-LIE  , WANG ZHU-FENG  ,   中国科学院物理研究所
Published: November 2020

The M?ssbauer spectra, the magnetic properties, neutron diffraction and X-ray pho-toelectron spectra of pure and Co coated α-Fe2O3 have been measured. It is found that the Morin transition temperature of α-Fe2O3 is influenced and the eoercivity is increased obviously by Co coating. We suggest that a fine structure (single ion) anisotropy energy constant Kfs would be decreased by Co coating, this could explain the experimental results.
THE ELECTRONIC STRUCTURE OF ScH2 AND HfH2
Authors: XU JIAN-HUA  ,   中国科学院上海冶金研究所
Published: November 2020

The electronic structure of ScH2 and HfH2 have been calculated by using the self-consistent LMTO-ASA method, without placing an extra muffin-tin sphere at the octahedral site in the fcc lattice to make a correction for muffin-tin potential. In the case of ScH2, the result is in good agreement with that of Peterman and Harmon and the photoemission data, the only discrepancy is the position of T2, which is located below the Fermi level rather than above it, therefore, the occupancy of proton in the octahedral site is quite possible. The general feature of the calculated density of states of HfH2 is in reasonable agreement qualitatively with the photoemission data. The electronic charge within the hydrogen sphere is about 1.2-1.3.
THE THEORY OF FTIR-Q SWITCH RESONATOR
Authors: ZHANG ZHEN-XI  , Lü BAO-LING  ,   西北大学物理系
Published: November 2020

In this paper, the fundamental theory of FTER-Q switch resonator is developed. The resonator is composed of many optical elements, it cannot be solved by the conventional method. Combining matrix optics with integral equations of diffractions of optical resonator, we obtain a theoretical solution, which gives out a lot of quantities, such as Fre-snel number, diffration losses, resonace frequency and its interval, etc., that can be compared with the result of parallel plane resonator.
A NEW METHOD FOR PERFORMING OPTICAL MELLIN TRANSFORM
Authors: ZHENG SHI-HAI  , YANG GUO-ZHEN  , LIN QING-JING  , LI GUO-ZHEN  ,   (1)中国科学院物理研究所; (2)中国科学院一○九厂
Published: November 2020

This paper describes a new method for performing Mellin transform. The principle of design of hologrophic lens and the method for making binary computer-generated holograms are given. A 1-dimensional Mellin transform with sixteen sampling spots is performed by the experiment. The method can be directly extended to the 2-dimensio ual case.
EXPERIMENTAL EVIDENCE OF N-S STATE OF NON-EQUILIBRIUM SUPERCONDUCTOR
Authors: YANG QIAN-SHENG  , YIN BO  , LIU GUI-RONG  , WANG XIAO-LIN  ,   中国科学院物理研究所
Published: November 2020

Superconducting lead film is driven into the non-equilibrium state by tunnel injection of quasi-particles. There are two kinds of zero resistance state under the same injection level, depending upon the sample history. With the help of double tunnel injection, we found one of them is in the homogeneous non-equilibrium superconducting state and the other in the N-S inhomogeneous one.
THEORY OF THE CRITICAL TEMPERATURE FOR SUPERCONDUCTORS WITH SMALL λ(III)
Authors: WENG ZHENG-YU  , WU HANG-SHENG  ,   中国科学技术大学物理系
Published: November 2020

The Tc formula, derived in the previous papers of this series, is examined by comparing the Tc values, calculated from it, either with the numerical solutions of the Elia-shberg equation or with the experimental values of various superconductors. The agreement between them are satisfactory for superconductors with small λ.
PHOTON GREEN FUNCTION FOR THE TRANSMITTANCE OF ANHARMONIC CRYSTAL
Authors: ZHOU QIN  ,   中国科学院化学研究所
Published: November 2020

The transmittance of a crystal can be expressed in terms of the photon's Green function (GF), solved by the equation of motion method for the GF and evaluated numerically. In the particular case of absorption of two phonons by an anharmonic crystal the formulae are derived for the, self energy of the photons and then for the transmittance of the crystal.
THEORETICAL EXPLANTION OF SUPERCONDUCTIV CRITICAL TEMPERATUARE CHANGES OF CeCu2Si2 WITH PRESSURE
Authors: FENG SHI-PING  ,   北京师范大学物理系
Published: November 2020

Under the BCS mechanism, we use Anderson model to explain CeCu2Si2 supereon-ductiv critical temperature change with pressure in low pressure range.
DIRECT MEASUREMENT OF MULTIPLE QUANTUM RELAXATION TIME IN AX SYSTEM
Authors: YANG JI-CHUN  , WU QIN-YI  , YE CHAO-HUI  ,   中国科学院武汉物理研究所
Published: November 2020

A direct measuring method of multiple quantum relaxation in the AX systems without 2D is proposed. The approach like those of routine measurements of relaxation time is simple and accurate. The cross correlation coefficient of fluctuation magnetic field, which is not obtainable with single quantum NMR alone, is deduced from the multiple quantum relaxation times measured by this method. The unique mechanism of multiple quantum relaxation in AX systems is also discussed.
THE PHYSICAL MODEL OF METHOD OF VOLTAGE SHORTED COMPACTION (VSC) FOR CONDUCTIVITY MEASUREMENT
Authors: WAN MEI-XIANG  , WANG PING  ,   中国科学院化学研究所
Published: November 2020

A three layer series-parallel model of the Voltage Shorted Compaction (VSC) method for conductivity measurement of organic conductor was proposed. According to this model, the mathematical expressions of conductivity and temperature dependence of conductivity of VSC device was obtained as well as the intrinsic properties of VSC measurement. Furthermore, the technical point for preparation of VSC device was dis-cussed.
THE SOLITON SOLUTION AND SIZE EFFECT IN K-S MODEL
Authors: WANG KE-LIN  , WU ZI-YU  , WANG MAO-HUA  ,   (1)北京航空学院; (2)中国科学技术大学基础物理中心
Published: November 2020

A non-topological soliton solution of φ4 equation has been obtained, then the size effect and related problems were discussed in K-S model.
MAGNETIC PROPERTIES, ELECTRICAL RESISTIVITY AND CRYSTALLIZATION BEHAVIOR OF AMORPHOUS Fe90-xBxZr10 ALLOYS
Authors: SHEN BAO-GEN  , ZHAN WEN-SHAN  , ZHAO JIAN-GAO  , CHEN JIN-CHANG  ,   (1)北京师范学院物理系; (2)中国科学院物理研究所
Published: November 2020

The effects of B content on the magnetic and electrical properties and crystallization behavior of amorphous alloys based on FeZr are studied in this paper, and compared with amorphous FeB alloys. The reasons of the average magnetic moment per FeZr atoms. μFeZr and Curie temperatures Tc increase with increasing B content are explained. Finally, the scattering mechanisms of electrical resistivity at various temperatures and effects of B or Zr element on the crystallization temperature in these alloys are discussed.
THE PERTURBATION SOLUTION OF OPTICAL BLOCH EQUATION WITH RELAXATION TERMS IN SATURATED SPECTROSCOPY
Authors: WANG QING-JI  , XIE CHUAN  ,   北京大学无线电电子学系
Published: November 2020

Tn this paper, the optical Bloeh equation with relaxation terms in saturated spe-ctroseopy is solved directly by using the perturbation theory. The reenrren formulas are given, approximate results of any order can be obtained from them. The first and second order solutions are derived and explained.
THE THERMAL BEHAVIOR OF ELASTIC CONSTANTS OF BERLINITE (α-AlPO4)
Authors: WANG HONG  , XU BIN  , HAN JIAN-RU  , LI TI-JIU  , HUO LUO-YUN  ,   (1)山东大学晶体材料研究所; (2)山东大学物理系,80届毕业生
Published: November 2020

Samples of berlinite (α-AlPO4) have been grown by slow heating method. The thermal behavior of elastic prepeties have been studied by transmission method from 30℃ to 150℃. The equations for the temperature behevior of elastic constants have been obtained by polynomial least square method and the 1st, 2nd and 3rd order temperature coefficients of the elastic constants have been calculated (T0=25℃).
CONSTRAINT ON THE GAUGE MODELS OF CONFINING WEAK INTERACTIONS FROM THE GRAND UNIFICATION
Authors: ZHANG XIN-MIN  , XIU XIAO-ZHOU  ,   新乡师范学院物理系
Published: November 2020

In this paper, under the conditions: 1014 GeV≤Mu≤1019 GeV, 300 GeV ≤Λhc≤l TeV, we show that, in the models of confining weak interaction, the hypercolor gauge groups SU(N) satisfy N≤3, and grand unification gauge groups are possibly SU(N) N≥7 SU(N)×SU(N) N≥4, SO(14) and SO(18).
A TEM STUDY OF Pd-Si THIN FILM SOLID-PHASE REACTION
Authors: ZHANG JING  , LIU AN-SHENG  , WU ZI-QIN  , GUO KE-XIN  ,   (1)北京有色金属研究总院; (2)中国科学技术大学基础物理中心; (3)中国科学院金属研究所
Published: November 2020

The initial silicide formation during the deposition of Pd to room-temperature Si (111) substrate and the dependence of Pd2Si-Si orientation relationship on Pd film thickness have been studied by TEM. The results show that the only silicide phase formed is Pd2Si under annealing temperature from 170℃ to 600℃. A thin layer of Pd2Si has grown without annealing, even when the substrate is kept in room-temperature. The Pd film thinner than 100 nm leads to epitaxial Pd2Si layer on Si (111), while the Pd film of about 400 nm gives the [0001] Pd2Si fiber texture. Various kinds of defect with high density exist in the silicide film and the interface.
THE HYDROGEN CONTENT IN γ-Fe2O3
Authors: DU YOU-WEI  , LU HUAI-XIAN  , WANG TING-XIANG  , LIU SHENG-KANG  , JIANG ZHI-LIANG  , ZHANG YU-CHANG  , CHEN YI-MEI  ,   (1)南京大学固体物理研究所; (2)南京大学物理系
Published: November 2020

The hydrogen content in γ-Fe2O3 was determined by thermal neutron transmission method. The phase transformation of γ-Fe2O3 was studied with D. T. A., magnetic analysis and Mossbauer effect. The presence of hydrogen in the crystal structure of γ-Fe2O3 was ascertained by the experimental results. The crystal structure of γ-Fe2O3 become more stable and the transformation temperature from γ-Fe2O3 to α-Fe2O3 will increase when the cation vacancy of γ-Fe2O3 was occupied by H1+, Co2+, Si4+, P5+ ions etc.
THEORY OF RESONANT SELF-FOCUSING
Authors: MA JING-XIU  , XU ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

In the present paper, by using optical mixing and self-focusing theory, the resonant self-focusing effect of two parallelly propagating laser beams with frequency difference equal to the plasma oscillation frequency in a homogeneous plasma is studied theoretically. The nonlinear dielectric constant and the threshold power for resonant self-focusing are derived analytically. The scaling laws of the threshold power with respect to laser-plasma parameters are discussed and compared with that of usual ponderomotive self-focusing. Finally, the effect of the deviation from frequency matching condition on the threshold power is also studied.
DISSIPATIVE DRIFT INSTABILITIES IN A HOT ELECTRON PLASMA
Authors: HUANG CHAO-SONG  , REN ZHAO-XING  , QIU LI-JIAN  ,   中国科学院等离子体物理研究所
Published: November 2020

Density-gradient-driven dissipative drift instabilities in a hot electron plasma are studied. Dispersion relation (including that of resistivity and viscosity) is derived. Hot electron ring can reduce growth rate of the instability and anomalous transport flux. Stability condition for the drift wave is βh>4ξ/(l + 2ξ). The fluctuation levels and the exciting region of drift mode are measured, and the stabilizing effects of hot electron ring observed. It is found that the experimental results are consistent with the theoretical predictions.
THE LOCALIZATION OF THE VIBRATIONAL MODES AROUND THE SOLITON
Authors: XIE SHI-JIE  , LI ZHONG-YI  , SUN XIN  ,   (1)复旦大学物理系; (2)山东大学物理系
Published: November 2020

In order to figure out the localizations of the five localized modes around the soliton in polyacetylene, the dependences of their configurations on the length of the chain have been studied in both the open chain and the close ring cases. For the open chain, it is found that the localized mode g4 has some different behavior from the localized modes g1, g2, g3 and g5, namely, when the length of chain is increasing, the configurations of g1, g2, g3 and g5 do not change, whereas the wings of g4 become broader, this means that the localization of g4 is not so complete as the other localized modes.
OPTICALLY INDUCED LIGHT DIFFRACTION IN LiNbO3: Fe
Authors: WU ZHONG-KANG  , WAN JIN-XIONG  , ZHANG GUANG-YIN  , LIU SI-MIN  , MOU ZONG-YING  , LU YONG-BIN  , XU YU-HENG  ,   (1)哈尔滨工业大学化学系; (2)南开大学物理系
Published: November 2020

In This paper, Diffraction cones are studied in LiNbO3:Fe. These diffracted cones are shown to result from the degenerate four wave mixing among the incident reflected and scattered beams induced by imperfections in the crystals. The angles of the cones are determined by phase matching condition △k = 0, which can be achieved by Ewald sphere construction from diffraction theory, while diffraction cones induced by degenerate four wave mixing of time-resolution are also discussed.
AN INVESTIGATION ON POLYCRYSTALLINE BORON AND BORON-CONTAINING METALLIC GLASSES BY SEELFS
Authors: FEI LU  , ZHENG YU  , ZHANG QIANG-JI  , HUANG JIN-LIN  , HUA ZHONG-YI  ,   复旦大学现代物理研究所
Published: November 2020

The slow electron energy-loss spectra in a reflection mode recorded above a core-level, known as the surface extended energy-loss fine structure (SEELFS), can give detailed local surface structural information of solids. This work reports for the first time the investigation of the role the boron atoms play in polycrystalline boron, Fe80B20 and Fe78.5 Si5B16.5 samples by using this technique. The oscillating structures were up to 300 eV above the boron K-edge. With the program daveloped in this laboratory, the radial distribution functions around the excited site were obtained by analyzing the SEELFS data. After phase-shift correction, the nearest-neighbor bondlengths of surface atoms were found: 1.57 ? for polycrystalline boron, 2.14 ? for Fe80B20 and 2.12 ? for Fe78.5Si5B16.5</sub. Factors influencing the calculations are discussed and the total error has been estimated as 0.05-0.08 ? for central atoms with low atomic number. For the SEELFS spectra in the derivative mode, it is difficult to obtain other structural parameters, e.g. coordination number, factor of atom disorder, etc. Therefore, other mode must be considered.
NON-THEPMAL DISTRIBUTION AND TOTAL ENTROPY INCREASE OF SCALAR PARTICLE GAS IN THE MULTI-DIMENSIONAL UNIVERSE
Authors: ZHOU MIN-YAO  ,   上海师范大学物理系
Published: November 2020

In this paper, we discuss the non-thermal distribution, the energy density and entropy increase of a massless particle gas in the Multi-dimensional phase of universe. Starting from the assumption that the distribution of particle number be invariant during the inflation, and in the approximate condition that the initial temperature T0 = β0-1 1/2a20-1 (D is the dimension of the extra space and a20 is the scale of the extra space befor inflation), we calculate the ratio of the total entropy St at the ending of the Multi-dimensional phase to the corresponding quantity S0 in the initial stage, which has the same order of magnitude as the ratio of T0a20 to Tfa2f (Tf is the temperature just as the universe enters the ordinary phase and a2f is the stable scale of the extra space. Planck unit, h =c = kB=G= 1, is used throughout ).
THE CONDITIONS OF CONDENSATION AND GROWTH OF a-Si FILMS ON VARIOUS SUBSTRATE MATERIAL SURFACE
Authors: WANG ZHI-CHAO  , SONG JIE  ,   (1)广播电视部广播科学研究所; (2)南京大学物理系
Published: November 2020

In this paper, we report the observed conditions of condensation and growth of a-Si on different kinds of substrate materials surfaces studied with the SEM technology. Explanations about the phenomena are given.
THE LOCALIZATION AND CORRELATION EFFECT OF THE POTENTIAL FOR STRUCTURAL MODELLING OF BINARY AMORPHOUS ALLOY
Authors: WANG JING-HAN  , CHEN JIN-CHANG  , ZHAN WEN-SHAN  , ZHAO JIAN-GAO  , SHEN BAO-GEN  , WANG XU-WEI  , LI DE-XIU  ,   (1)北京航空学院应用数理系; (2)北京师范学院物理系; (3)云南大学物理系; (4)中国科学院物理研究所
Published: November 2020

The primary DRPHS configuration are relaxed with Lenard-Jones and Morse potential respectively for Co81P19 and Ni64B36 amorphous alloys. Two displacement fraction f=0.005 and f=1 are considered in the case of Ni64B36. Total energy, reduced partial distribution function and angular distribution function are obtained from the calculated data. Effect of localization and correlation of potential function on chemical short range order in binary amorphous alloys are discussed.
A PROJECTION-ITERATION METHOD FOR SOLVING THE CAUCHY PROBLEM OF THE FLUX FUNCTION EQUATIONS
Authors: LUO ZHENG-MING  ,   四川大学原子核科学技术研究所
Published: November 2020

In this paper, an optimal iteration procedure, the projection-iteration method, is developed to solve the Cauchy problems of the flux function equation. This method exhibits higher convergent speed and is suitable for calculating the plasma configurations with divertors. Several important plasma configurations have been calculated. The numerical solutions are found to be in good agreement with the analytical solutions.
HIGHER-ORDER HARMONICS EMISSION IN CO2-LASER IRRADIATED TARGETS
Authors: YU WEI  , XU ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

In this paper, we extend our previous work and calculate the field structure and the conversion efficiency of the higher order harmonics emission. In calculation, the effect of density profile steepening in the vicinity of the critical density has been taken into account by assuming a bilinear density profile. The analytical results obtained can give a reasonable explanation to the physical phenomena observed in CO2-laser experiments.
PROFILE OF CURRENT DRIVEN BY LOWER HYBRID WAVES IN TOKAMAKS
Authors: YIN RONG-XIANG  , DIN HOU-CHANG  ,   中国西南物理研究所
Published: November 2020

The downshift of lower velocity limit of resonant electrons in Landau damping due to the trapping of electrons in the potential barrier formed by the large-amplitude electrostatic waves is considered. By means of the ray-tracing method, the energy deposition of LHW on its trajectory in tokamks is computed. Considering the balance between the energy deposition and the Joule heating effect of the LHW driven current, the profile of LHW driven current in tokamaks has been obtained. The calculated results about PLT and JFT-2 are in agreement with the experimental results. For HL-1 device the computed results is also optimistic.
EFFECT OF PRESSURE ON ELECTRICAL RESISTANCE OF METALLIC GLASSES Fe100-xBx
Authors: HAN SHUN-HUI  , HAN HAN  , ZHAN WEN-SHAN  , SHEN BAO-GEN  , LI DE-XIN  ,   中国科学院物理研究所
Published: November 2020

Measurements have been made on the electrical resistance of the metallic glasses Fe100-xBx (12≤x≤24) as a function of hydrostatic pressure in the range 0-8 kbar at room temperature. In all of the samples, the pressure coefficient of resistance aF( = d'ln R/dP) are negative This resistance-pressure behavior are discussed in cerms of the generalized Ziman theory.
INFLUENCE OF Ag CONTENT ON OPTICAL PROPERTIES OF Ag-Cs2O THIN FILMS
Authors: LI JIAN-PING  , LIU WEI-MIN  , WU QUAN-DE  ,   (1)北京大学无线电电子学系; (2)北京大学无线电电子学系,北京中国科学院电子学研究所
Published: November 2020

The variations of glass refletance or front reflectance Rf, vacuum reflectance Rv and tran-smittance T of well activated cesium oxide thin films with Ag addition were measured within the visible and infrared range. Rv increases as the amount of Ag increases, but Rf decreases at first, then increases. Optical absorptions of the thin film and silver particles increase as the amount of Ag increases, and its photoemission increases at first, and then decreases. A model with inhomogeneous distribution of silver particles is proposed.
SILICON FILM DEPOSITED BY LASER-PLASMA
Authors: FU GUANG-SHENG  , HAN LI  , LI XIAO-WEI  , ZHANG LIAN-SHUI  , DONG LI-FANG  , LU FU-RUN  , XUE CHUN-YIN  ,   河北大学物理系
Published: November 2020

In this work, the laser diposition process of Si thin film at low temperature and under low pressure is studied. We obtain both poly-crystalline and non-crystalline films, the sizes of them are about a few cm2, and they are satisfactorily homogeneous. The optimum condition of diposition process is determined care-fully. When the pedestal temperature is 380°, poly-crystalline films are formed. Based on the model of photo-breakdown of SiH4 through resonant absorption of laser and energetic Si-atom formation induced by the shock waves produced thereafter, the laser plasma CDV dynamic process is analysed. We find that the photo-breakdown of SiH4 by TEA CO2 laser and the induced shock waves have important influuences on the growth of Si films. The sizes and crystalline structure of Si films as calculated theore tically agree qualitatively with experimental results.
EXPERIMENTAL STUDIES OF EXCITED STATES IN COLLISIONS BETWEEN He+ AND Ar
Authors: PAN GUANG-YAN  , LEI ZI-MING  , LIU JIA-RUI  ,   中国科学院物理研究所
Published: November 2020

One electron capture process and direct exciting process both occured in collision between-He+ and Ar in energy range 70-150 keV. From the comparison of experimental results between He++Ar and He++Ne collision systems, we see that the emission cross sections of the triplet Hel of the former are much larger than those of the latter, when the velocity of incident ion He+ is small. The latter become larger than the former, when the velocity of He+ is greater than 1.0 a.u (2.2×108 cm/s). Therefore, the potential energy defect and the velocity of projectile are very important factors in the electron capture process and there is a competition between them-in collisions.
THE DAMAGE PHENOMENA ON INFRARED MATERIALS IRRADIATED BY INTENSE PULSED CO2 LASER
Authors: WANG CHUN-KUI  , FANG HUI-YING  , FU YU-SHOU  , LI SHU-YING  , LI HUI-NING  , WU ZHAN-LIN  , LIU SHU-YING  , MEI HUA  ,   (1)北京电子工程总体设计部; (2)中国科学院力学研究所
Published: November 2020

Experiments show that the materials damage effects irradiated by intense CO2 laser can be divided into two types: the ablation and shock wave damage. The ablation is dominant when laser power density is lower than air breakdown threshold. When laser power density is higher than berakdown threshold, the shock wave damage becomes prime. Under our experimental condition, when strong laser beam irradiates on brittle targets such as infrared window materials MgF2, KCl, Ge, etc., small cracks or broken pieces are formed very easily. The damage effects are related to pulse energy, power density, pulse width and irradiated area on the target. The photographs of radiation damage are also given.
SPONTANEOUS CURRENT GENERATED FROM LASER PLASMA
Authors: WANG RUN-WRN  , PAN CHENG-MIN  , LIN ZHUN-QI  , ZHU DA-QING  , HE XIN-FA  , ZHAN JI-RAN  , WANG XIAO-QING  , CHENG ZHONG-YU  , BAI JIAN-RONG  , JIANG MING-HUA  ,   中国科学院上海光学精密机械研究所
Published: November 2020

We studied a phenomena of spontaneous current generated from laser plasma, which was produced from several plane target made from Rh, Ag and Cu irradiated with high power laser light. The pulse-width, output energy and wavelength of the laser were 200 ps (FWHM), 0.1-4J and 1.06 μm. respectively. At the focus spot of the target irradiated with laser, a spontaneous current density as high as 107A/cm2 was found in the experiment.
DYNAMICS OF MULTIPHOTON IONIZATION OF ACETALDEHYDE BY UV LASER
Authors: ZHU RONG  , HAN JING-CHENG  , GUAN YI-FU  , LIU HOU-XIANG  , LI SHU-AIO  , WU CUN-KAI  ,   (1)中国科学院安徽光学精密机械研究所; (2)中国科学院安徽光学精密机械研究所,中山大学物理系
Published: November 2020

In this article, we present the experimental results of mass spectroscopic study of multi-photon ionized acetaldehyde molecules in gaseous phase excited by XeCl excimer laser under the molecular beam condition. Based on the linear relations between the intensities of fragment ions and the pressure of sample gas, we show that the multiphoton ionization and fragmentation of acetaldehyde is an unimolecular reaction, this result reveals some photochemical be havior of acetaldehyde in the photolysis process by uv laser. According to the MPP mass spectrum of acetaldehyde, the variation of the intensities of the fragment ions in the MPI mass spectrum with laser power and photophysical property of its first excited single state 1(n,π*), we propose a parent dissociation-neutral fragments ionization model of MPI of acetaldehyde, with which the experimental results can be explained.
STUDY OF FAST IONIC CONDUCTOR BY POSITRON ANNIHILATION
Authors: WANG YUN-YU  , PAN XIAO-LIANG  , LEI ZHEN-XI  , YANG JU-HUA  ,   (1)北京市建筑材料科学研究所; (2)山东建筑材料学院; (3)中国科学院高能物理研究所
Published: November 2020

The fast ionic conductor, LiCl-LiF-B2O3, LiF-B2O3 in microcrystalline and non-crystalline forms were studied by positron annihilation. It was found in all cases, the intensity of the mid-lifetime component I2 depends directly on the electrical conductivity σ. Additional measurement of Doppler broadening on the same systems indicated that voids between the microcrystal and network phases provid more transfer path for Li ions, thus lead to higher conductivity in the microcrystalline form of LiCl-LiF-B2O3 system.
STATISTICAL TEEORY OF IMPURITIES AND DEFECTS IN a-Si:H
Authors: CHEN GUANG-HUA  , PENG YING-QUAN  , CHEN JI-HONG  ,   兰州大学物理系
Published: November 2020

This article present a multi-level model on the doping mechanism and defect state in the gap of a-Si:H films, and calcnlate the doping efficiency η using the method of statistical physics. It was found that the results from the model and calculation not only cover all arguments of Street et al., but also make a distinction between heavy and light doping. The η of light doping agrees with usual results, only heavy doping obeys η∝?-1/2low.
A STUDY OF SPIN WAVE IN Fe3Si AT LOW TEMPERATURE
Authors: TAO FANG  , YAN QI-WEI  , SHEN ZHI-GONG  , P. v. BLANCKENHAGEN  , LIN HONG  , LIN QUAN  ,   (1)Kernforschungszentrum Karlsruhe,FRG; (2)中国科学院物理研究所; (3)中国原子能科学研究院
Published: November 2020

The dispersion relation of spin wave in Fe3Si at 14 K has been measured by inelastic coherent neutron scattering. The spin wave stiffness constant D0, which is obtained experimentally from quadratic dispersion of spin wave, equals 270 meV ?2. A calculation of effective exchange integral Jeff has been done in the frame of Heisenberg model. From the temperature dependence of magnetization, a spin wave stiffness constant Dm(0) can be derived also. There is an indication of the existence of Stoner excitations from a comparison of D0 and Dm(0). The temperature dependence of spin wave stiffness constant is also gaven.
BRILLOUIN SCATTERING FROM BCVIG SINGLE CRYSTALS
Authors: ZHANG PENG-XIANG  , PANG YU-ZHANG  , G. GüNTHERODT  , R. MOCK  ,   (1)II Physikalisches Institut,Universitat Koln,5000 Koln41,FRG; (2)中国科学院物理研究所
Published: November 2020

Magnon spectra were measured by means of Brillouin scattering from single crystals BCVIG (Bi3-2xCa2xFe5-xVxO12). We obtained a continuous band, including the bulk mag-non peak, which has been observed by Sandercock et al. in YIG, and Liu and Zhang et al. in Bi-YIG. The measured dispersion relation of the magnon band was analysed based on the theory of dipole-exchange spin waves. This measurement also show that the spin wave stiffness constant D is much larger than that of YIG and Bi-YIG. The reason of the lager D is discussed and its dependence on the incident laser power was studied.
THE ELASTIC GREEN'S FUNCTION OF ANISOTROPIC CUBIC CRYSTALS AND ITS APPLICATIONS
Authors: YANG ZHENG-JU  ,   南京大学物理系固体物理研究所
Published: November 2020

The series expension of elastic Green's function of anisotropic cubic crystal is calculated and the expansion coefficients are given under the second order approximation. Applying the results to elastic dipole model, one obtains the expressions of elastic displacement field due to a symmetrical center and the interaction between two symmetrical centers. For strongly anisotropic cubic crystals such as K and Cu, it is surprising that the numerical results of the displacement field of the symmetrical center and the interaction between them are basically the same as those obtained by using lattice statics, which is based on the discrete native of the lattice, although the convergence is not very satisfactory. This seems to indicate that our analytical expression of the elastic Green's function leads to a simple and easy method, which can be used generally to describe some mechanical behaviour of cubic crystals correctly.
THE PHOTODISSOCIATION DYNAMICS OF CYANAMIDE AT 193 nm
Authors: XIE XIAO-XIANG  , I. A. MCLAREN  , J. B. HALPERN  , W. M. JACKSON  ,   (1)美国Howard大学化学系; (2)美国加州大学Davis分校化学系; (3)中国科学院安徽光学精密机械研究所
Published: November 2020

The photodissociation dynamics of cyanamide have been investigated. Laser-induced fluorescence (LIF) was used to study the formation of CN(X2∑+) radical in the photodissociation at. 193 nm. A very weak LIF signal from the CN(X) radical was detected at a laser intensity of 0.35 mJ/pulse and the rotational temperature is 1590±90 K. When the laser intensity is high, the LIF signal increased obviously and the population in the ν"= 2 level was observed. The absorption cross section we measured at 193 nm is less than 2.4±10-19cm2 at a temperature of 50℃. A secondary photolysis mechanism can be used to explain the experimental results.
PROPERTIES OF κ-PHOTON UNITARY OPERATOR
Authors: GUO GUANG-CAN  , WU CHANG-HONG  ,   中国科学技术大学物理系
Published: November 2020

We have studied the properties of k-photon unitary operator Sk(z), including the change in properties of phase space under the action of Sk(z) and properties of coherent state and vacuum state which underwent the action of high order nonlinear processes. The results show that the light field should have some new non-classical properties which is unknown as yet.
HEXAGONAL METASTABLE PHASE IN Fe-12.6 at%B ALLOY PRODUCED BY SPLAT-MELTING
Authors: QIN ZHI-CHENG  , WANG WEN-KUI  , HE SHOU-AN  ,   中国科学院物理研究所
Published: November 2020

The lattice structure of a new metastable phase in Fe-12.6 at %B alloy produced by splat-melting has been determined by X-ray diffraction and electron diffraction. All of the diffraction pattern can be uniquely indexed in terms of the hexagonal lattice with the lattice parameters a=5.501 ?, c= 7.213 ? and c/a = 1.311.
THEORETICAL EXPLANTION OF THE CHANGE OF LOW TEMPERATURE SPECIFIC HEAT OF HEAVY-FERMION COMPOUND CeAl3 WITH PRESSURE
Authors: FENG SHI-PING  ,   北京师范大学物理系低能核物理研究所
Published: November 2020

We use periodic Anderson Model Hamiltonian to explain the change of the low-temperature-specific heat of heavy-fermion compound CeAl3 in low pressure range.