bluuebunny/crossref_metadata_2025 huggingface dataset:
THE FINE STRUCTURES OF THE SECOND HARMONIC TIME RESOLVED SPECTRUM IN LASER PLASMAS
Authors: GU MIN  , TAN WEI-HAN  , LIN ZUN-QI  , BI WU-JI  , 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

This paper presents the time resolved spectrum with high temporal resolution (～10ps) and spectral resolution (～ 0.6?) of 2ω0 harmonic emission at 90°to the laser axis. It is shown experimentally that the primary peak and the secondary peak of 2ω0 harmonic are actually composed of many fine and bright fringes with the interval about 1.5 ～ 3? directly connected with atomic weight. Analysis and discussion on these are given.
STUDY THE PHASE TRANSITION FOR THE PTS SINGLE CRYSTAL AT LOW TEMPERATURE BY PHOTOACOUSTIC EFFECT
Authors: DU YING-LEI  , WU BAI-MEI  ,   中国科学技术大学
Published: November 2020

The photoacoustic signal and phase angle have been measured for the single crystal of Polybis-(p-toluence sulfonate) of 2,4-(hexadiyne)-l,6-diol(PTS) in the temperature range of 175-225 K based on the photoacoustic effect (PAE.) The jump of photoacoustic signal and phase angle at 200 ±0.5 K was observed. We suggested that the jump can be attributed to the second order structural phase transition in PTS.
THE PROPERTIES OF AMORPHOUS GdTbFe FILM FOR MAGNETO-OPTICAL RECORDING
Authors: WANG YIN-JUN  , TANG QIAN  , YANG KE-MIN  , CAI HENG  , SHEN JIAN-XIANG  , ZHANG XU-XIN  ,   (1)南京大学物理系; (2)中国科学院物理研究所
Published: November 2020

Prepared by using bias magnetron-sputtering, the deposited GdTbFe films possess the suitable parameters for magneto-optical recording. The perpendicular anisotropy constant Ku increases with the increase of bias voltage. By means of the plots from both Johnson-Mehl-Avrami equation and Kissinger equation, the parameters of crystallization kinetics, △E = 2.0eV and n = 1 have been determined for amorphouss Gd27Tb10Fe63 film. The crystallization temperature and active energy AE of the amorphous Gd27Tb10Fe63 film are greater than the binary system, GdCo, GdFe, for example. The isothermal annealing of amorphous Gd27Tb10Fe63 film at various temperature shows that it has a good thermal stability which is required for magneto-opticai recording application.
TRANSMISSION PROBABILITY IN ONE-DIMENSIONAL NORMAL-METAL MULTICHANNEL STRUCTURE
Authors: CHEN GENG-HUA  , ZHAO ZHONG-XIAN  ,   中国科学院物理研究所
Published: November 2020

In this paper, the strictly one-dimensional normal metal multichannel structures are considered. We point out that the structures in multichannel cases can also be treated with an improved form of Büttiker's method, which was originally used for two channel cases. A formula for multichannel transmission coefficient is presented. As a simple example, the numerical results for three branches are given, which show the application of the formula and illustrate the transmission probability resonances in such structures.
GENERAL CONVERSATION LAWS IN EINSTEIN-CARTAN THEORY
Authors: DUAN YI-SHI  , LIU JI -CHENG  , DONG XUE-GENG  ,   兰州大学物理系
Published: November 2020

Using Noether's theorem, the conversation laws for general Lagrangian in Einstein-Cartan theory are derived. The general covariant energy-momentum conversation law for general Lagrangian including torsion is obtained from general displacement transformation xμ＇=xμ+edμba. It is shown that in our general case the superpotential must be existed. This result is the natural extension of the theory in references [1] , [2].
ATOMIC COLLISION PROCESSES WITH HIGH ENERGY ATOMIC IONS
Authors: TONG XIAO-MIN  , LI JIA-MING  ,   中国科学院物理研究所
Published: November 2020

Based on the first Born approximation, we develope a simple theoretical method to calculate the cross sections of various high energy atomic collision processes. For the 4 kinds of incident particles (H+, e-, H, H-) our theoretical cross sections for the target-atom excitation process Na(3s-3p) are consistent with the recent absolute experimental measurement.
LANDAU'S FERMI LIQUID THEORY OF HEAVY-FERMION SUPERCONDUCTING SYSTEMS
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 have established approximately a relation between the parameters of periodic Anderson-model hamiltonian and the Landau's phenomenalogical parameters, and applied it to heavy-fermiqn superconducting systems. Calculation results are in agreement with experiment results-qualitatively. We conclude that superconducting systems induced by heavy-fermion liquid interaction are P-wave type ones.
THE MEASUREMENT OF REFRACTIVE INDICES AND DENSITY OF RARE-EARTH PENTAPHOSPHATE CRYSTALS
Authors: LI BAO-XIANG  ,   中国科学院长春应用化学研究所
Published: November 2020

In this work, the refractive indices, density, molar volume and molar refractive degree of LnP5O14 crystals have been measured. The influence of wavelength and temperature on optical properties was also studied and some regular results were obtained. These results indicated that the properties of rare-earth compounds depend not only on the nature of rare-earth ion itself but also on the conditions of environment.
A PHENOMENOLOGICAL THEORY OF INTERFACE DYNAMICS IN THE PROCESS OF DIFFUSIONLESS PHASE TRANSFORMATION AND ITS APPLICATIONS
Authors: ZHANG JIN-XIU  , LI XIE-JUN  ,   中山大学物理系
Published: November 2020

The relationship between average velocity of phase and/or domain interface V and the effective phase transformation (PT) driving force in the process of diffusionless (DL) PT △G＇ (the difference between PT driving force AG and the resistence △GR, △G＇=△G - △GR) can be expressed as V = φ(△G - △GR). Consider a monodirectional varying external field (intensity is ξ and varying rate is ξ) exerted on a DLPT system, the phase interface moves and then the DLPT takes place when △G provided by the external field increases to a critical value △GR. If a hamonic external stress σ = σ0 sin ωt which can interact with the moving interface exerts on the system and the coupling factor is n,an expression between dynamic relation of interface V = φ(△G - △GR) and the internal friction in the DLPT process Q-1, related modulus defect △M/M, PT rate dF/dξ and the PT strain ε0 can be derived as d lnφ(△G＇)/d△G＇= Q-1ω/n2M(dF/dξ) = (△M/M)ω/nMε0(dF/dξ)ξ, or and (△M/M)Q-1=ε0/n. where ω is frequency of hamonic stress, M is modulus related to vibration mode. A gerenal solution of the interface dynamic equation can be obtained as V = ∑(±n)/(α≠-1) Aα exp[((△G - △GR)/△Gα*)α+1/(α+ 1)] +∑(m)/(β0) Aβ(△G-△GR)/△Gβ*)β where Aα,Aβare coefficient, △Gα* and △Gβ* are resistance parameters related to the high velocity interface. The specific solution and the value of △GR can be determined by the experimental data of the internal friction in the DLPT with diffrent ξ. The equation of (△M/M )/Q-1 can be used to determine whether the soft mode contributes in the process of DLPT.
EFFECT OF La (OR MISCHMETAL Mm) ON THE HYDROGEN STORAGE CHARACTERISTICS OF TiFe
Authors: LIANG JING-KUI  , RAO GUANG-HUI  ,   中国科学院物理研究所
Published: November 2020

The hydrogen storage capacities and pressure-composition isotherms of TiFe + La and TiFe + Mm alloys were measured by exhausting water method. The effect of La and Mm on the activation characteristics of the alloys was studied. It was shown that the activation characteristics of the alloys could be improved greatly and the alloys were activated near the room temperature when the quantities of La or Mm in the alloys were greater than 4 wt% under our experimental conditions. However, La or Mm did not enter the crystal lattice of TiFe. They presented in the alloys in the form of a second phase to purify the alloys. The hydrogen storage mechanism mainly depends upon the intermetallic compound TiFe. The formation enthalpies of the hypothetical hydrides TiFeLayH1.0, were also calculated after Miedema's formulae and compared with the experimental results.
NEW BEHAVIORS OF BIFURCATION AND CHAOS IN A NONLINEAR OPTICAL RING CAVITY
Authors: ZHAO YONG  , HUO YU-PING  ,   (1)中国科学技术大学物理系; (2)中国科学院等离子体物理研究所
Published: November 2020

In this paper, lkeda equation for a nonlinear optical ring cavity is studied by numerical method. It is found that the topological structure, the way of bifurcation and its convergence rate and the period-window-structure depend on the parameters B and φ0 in long delay time limit. In short delay time limit, some anomalous period-windows and nonperiod-doubling bifurcations are revealed, and it is also discovered that the self-similar structure in chaotic bands is blurred in the short time limit.
QUANTIZED MOTION OF TWO-DIMENSIONAL ELECTRONS IN A STRONG MAGNETIC FIELD
Authors: XIONG XIAO-MING  , ZHOU SHI-XUN  ,   复旦大学物理系
Published: November 2020

In the symmetric gauge with vector potential the one-body wave functions of two-dimen sional electron in a strong magnetic field have been obtained analytically. Based on the diseussing of two non-interacting electrons, we get a relation of the wave functions in two representations. This relation is useful in considering the interactions between the electrons.
EIGENENERGIES OF THE FRACTIONAL QUANTUM HALL EFFECT SYSTEM IN THE MASS CENTRE COORDINATE
Authors: XIONG XIAO-MING  , ZHOU SHI-XUN  ,   复旦大学物理系
Published: November 2020

The fractional quantum Hall effect system is analysed in the mass centre coordinate. An equation which restricts the combination of the single electron angular momentum is obtained. By using this restrictive relation, the dimension of the Hamiltonian eigenequations could be reduced. We also calculated the eigenenergies in the mass centre coordinate with the effect of the neutralizing background charges included.
ELECTRON SPIN RESONANCE PROPERTIES OF AMORPHOUS SILICON-BASED ALLOY FILMS AT HIGH TEMPERATURES
Authors: CHEN GUANG-HUA  , ZHANG FANG-QING  ,   兰州大学物理系
Published: November 2020

In this paper, we first investigated some important properties of high temperature ESR of doped (B and P) and undoped a-Si1-xCx:H and a-Si1-xNx:H alloy films. The ESR measurements were continuously performed in high temperature annealing process. Our experimental results show that: (1) For B-doped a-Si1-xCx:H and a-Si1-xNx:H films, a ESR absorption line can be decomposed to a broad (g1 = 2.005) and a narrow (g2 = 2.010) ESR absorption lines, g1 and g2 correspond to the contributions of Si dangling bonds and of holes in the valence band tail states, respectively. (2) The drop of hole density in the valence band tail states is faster than Si30 with rising temperature. The hole density in the valence band tail states is further larger than Si30 when temperature is low. However, the contribution of Si30 is the main one when temperature is very high.
AN ELECTRON STIMULATED DESORPTION STUDY OF OXYGEN ON NICKEL
Authors: GUO YUAN-HENG  , JIA CUN-LI  ,   (1)北京大学物理系,青岛大学物理系; (2)中国科学院北京真空物理实验室
Published: November 2020

Electron Stimulated Desorption (BSD) of O+ from polycrystal Ni surface was studied. The ESD O+ was measured after the Ni sample was annealed at 700℃ for two hour and then exposed to 20-60 L O2 at room temperature and 500℃ respectively. Two kinds of ESD O+ had been found with different electron energy thresholds (29 eV and 23 eV). It was concluded that the two O+s were due to Auger induced desorption and the two thresholds corresponded to O(2s) electron ionization energy and excitation energy respectively. The process of excitation, ionization and de-excitation was also discussed.
DIELECTRIC CHARACTERISTICS OF FERROFLUID
Authors: XU PEI-YING  , SHENG DONG-NING  , LU HUAI-XIAN  ,   (1)南京大学物理系; (2)南京大学信息物理系
Published: November 2020

When the ferrofluid is magnetized with biasing field, it's dielectric characteristics shows a magnetoelectric directive effect, i.e., the dielectric constant depend on not only the magnetic field, but also the relativf direction between the electric field and the magnetic field.In experiments, it has been observed that the magnetic particles in the ferrofluid are of spherical shape, and when magnetized with biasing field, they take a long-chain type distribution.In this paper, we analyze experimental results mentioned above and explain the magne-toelectric directive effects with long-chain model. The theoretical results are in agreement with experimental work.
PHOTOQUENCHING OF ELECTRONIC PARAMAGNETIC RESONANCE “AsGa” AND METASTABLE MECHANISM OF EL2 DEFECT IN GaAs
Authors: ZOU YUAN-XI  , WANG GUANG-YU  ,   中国科学院上海冶金研究所
Published: November 2020

We have discussed EL2 metastable mechanism combining with the theoretical calculations for the EL2 metastable "actuator" performed by Baraff and Schluter. On the basis of the experimental data for the Electronic Paramagnetic Resonance (EPR) "AsGa" photoquench-ings performed by Goltzene et al., we suggest that the AsGaVAsVGa atomic model, in which VAs and VGa are situated in the 1st and 2nd neighboring layers around AsGa antisite atom respectively, can be used for interpreting not only the capacitance but also the EPR "AsGa" photoquenching. This model seems more reasonable than AsGaVGaVAs, in which VGa and VAs are situated in the 2nd and 3rd neighboring layers around AsGa antistite atom respectively, as suggested by Wager and Van Vechten. In addition, our discussion has further supported the identification of the EPR "AsGa" defect ia n-irradiated GaAs as an isolated AsGa antisite atom, and has also shown a slight difference between EL2 defect configurations in LEC and HB GaAs crystals, which would be associated with the EL2 family phenomenon.
STUDY OF NEUTRON IRRADIATION-INDUCED DEFECTS IN n-TYPE VAPOR PHASE EPITAXY GaAs LAYERS
Authors: WU FENG-MEI  , WANG CHUN  , TANG JIE  , GONG BANG-RUI  ,   (1)南京大学物理系; (2)南京电子器件研究所
Published: November 2020

The characterization and thermal annealing behavior of deep-level defects in 1 MeV neutron irradiated VPE n-GaAs layers have been studied. The results indicate that the majority of induced defects are associated with displacement of two or more neighboring atoms. In addition, a new defect level E5(Ec-0.73 eV) emerges, as the H1 level anneals out, It is found that the changes of GaAs MESFET parameters are mainly due to the carrier removal.
ALTERNATING CURRENT PROPERTIES ANALYSIS OF SUPERIONIC CONDUCTORS
Authors: DING YI  , YU WEN-HAI  ,   中国科学技术大学物理系
Published: November 2020

Superionic conductors exhibit non-Debye behavior of solid dielectrics at low frequencies (f9Hz). Based on the characteristic of superionic conductors and a physical picture of Ngai's infrared divergent theory, we consider the fast ion transport as a non-Markovian process and analyze the alternating current properties of superionic conductors. The theory predicts that the admittance diagram is a line the curvature of which is less than one at higher frequencies. The discrepancy between theory and experiments at lower frequencies is due to interfacial effects.
POPULATION INVERSION OF ENERGY LEVELS OF MgXI 1s3p AND 1s4p UNDER THE CONDITION OF AVERAGE HIGH TEMPERATURE AND HIGH ELECTRON DENSITY
Authors: LIN ZUN-QI  , CHEN WEN-HUA  , YU WEN-YAN  , TAN WEI-HAN  , ZHENG YU-XIA  , WANG GUAN-ZHI  , GU MIN  , ZHANG HUI-HUANG  , CHENG RUI-HUA  , CUI JI-XIU  , DENG XI-MING  ,   (1)长春光学精密机械学院,毕业实习生; (2)中国科学院上海光学精密机械研究所
Published: November 2020

The microtube target with side jet burner is designed. Strong population inversion is observed along the whole side jet burner between the energy leveles of MgXI Is3p 1P00 and Is4p 1P00 while the average laser irradiance reached about 3.5×1013W·cm-2 on the inner wall of the microtube targets. The corresponding environment average electron temperature 470-520 eV and density of 2×10cm-3 of plasma at the inversion area is measured. The possible mechanisms of population inversion under the average high temperature condition has been analysed.
PILE-UP OF DISLOCATION WHILE EXISTING INHOMOGENEITY
Authors: GAO FEI  , ZHANG HONG-TU  ,   兰州大学材料科学系
Published: November 2020

In this paper, the method of continously distributed dilocations is used to obtain the exact solutions of distribution functions D1(η) and D2(η) for single pileup of screw dislocations formed aginst an obstacle and double pileups of sorew dislocations between an inclusion and an obstacle under action of an applied stress while existing inhomogeneity. At the pileup tip near the obstacle, D1(η) and D2(η) have inverse square root singularity and D2(η) has-ω power singularity at pileup tip near the inclusion. The double pileups is used to represent the antiplane shear crack terminating at the interface of inclusion and the stress intensity factors are obtained. The solutions presented are valid for 02/G1<∞ and the results are discussed.
THE SECTION TOPOGRAPHY OF SYNCHROTRON RADIATION (SST) ON THE CRYSTAL OF POTASSIUM ACID PHTHALATE (KAP)
Authors: ZHAO QING-LAN  ,   中国科学院福建物质结构研究所
Published: November 2020

The defect imaging contrast on the section topographs for the crystal of potassium acid phthalate (KAP) has been studied, using the synchrotron radiation. The experimental results show that the diffraction contrast due to defects in the crystal is considerably increased with the wavelength increasing in a certain range The dynamical theory of X-ray diffraction for homogeneously deformed crystals with average values of the strain gradient parameter βis taken to interpret the experimental results, for which the factor β teff plays an important role in the defect imaging contrast formation We propose that it is possible to choose an appropriate wavelength of synchrotron radiation which could give out higher diffraction contrast for defects in crystals.
DETERMINATION OF STRUCTURE AND DIELETRIC, ELASTIC AND PIEZOELECTRIC COEFFICIENTS IN FERROELECTRIC SINGLE CRYSTALS PbxBa1-xNb2O6 AND Li, Na-DOPED PbxBa1-xBb2O6
Authors: XU YU-HUAN  , WANG HONG  , CHEN HUAN-CHU  ,   (1)山东大学晶体材料研究所; (2)中山大学物理系
Published: November 2020

Two ferroelectric single crystals Pb0.37Ba0.63 Nb2O6 and Pb0.30Ba0.533Na0.306Li0.028 Nb2O6,pulled from melt by Czochralski technique, have been studied. By X-ray diffraction, it has been determined that both of two crystals belong to the tetragonal system with lattice parameters a = 12.493 ?, c = 3.984 ? for PBN, and a = 12.493 ?, c=3.970 ? for Li, Na-doped PBN. All of the dielectric, elastic, and piezoelectric coefficients of the two crystals have been measured. The results show that PBN crystal possesses good piezoelectric character with d15≈108×10-12C/N. This crystal could be a promising material for piezoelectric transducers operating in the shear mode. The dielectric constants are reduced, while the Tc is enhanced obviously in PBN doped by Li and Na Ions.
A THEORETIC EXPLANATION OF ELECTRIC HELD EFFECT OF EPR SPECTRA OF SrCl2:Co++
Authors: BAI GUI-RU  , XU CHANG-QING  ,   中国科学技术大学凝聚态理论研究室
Published: November 2020

The effect of electric field applied along [111] on EPR spectra of SrCl2:Co++ has been investigated. The result shows that electric field causes the crystal lattice to distort and deviate from its original cubic Oh symmetry to C3v symmetry. We have successfully explained the experimental rule that zero field splitting parameter D depends linearly upon electric field strength E and also predicted the coefficients of the change of the structure parameters a = - 8×10-5 a0 mm/kV (parallel to the electric field), β= 1.66×10-4 a0 mm/kV (perpendicular to the electric field).
A NOTE ON THE BIPOLARONIC MODEL
Authors: ZHENG HANG  ,   上海交通大学应用物理系
Published: November 2020

Via a reconsideration of a simple model for bipolarons, we have shown that in order to-keep the total energy of the model system to be a stable minimum, a new phonon coherent state should be introduced as a result of the electron-phonon interaction. Thus it could be in-fered that the reduction effect of phonons is much weaker and the range of the singlet bipo-laronic state as the stable ground state configuration is more extensive than what the previous authors considered.
RESONANCE FLUORESCENCE OF AN ADATOM NEAR THE SURFACE OF A PERIODIC OR QUASI-PERIODIC SUPERLATTICE FILM
Authors: LI XIAO-SHEN  , GONG CHANG-DE  ,   (1)南京大学物理系,中国科学院上海冶金研究所; (2)中国高等科学技术中心(世界实验室)理论物理中心,南京大学物理系
Published: November 2020

Resonance fluorescence spectrum and squeezing phenomenon are studied for an adatom near the surface of a periodic or quasi-periodic superlattice film using the surface-dressed optical Bloch equations. The influences of thickness and dielectric properties of each layer composing this film, number of layers, and geometry structures are discussed.
A STUDY OF DAMAGE IN SILICON CREATED BY P2+ IMPLANTATION
Authors: FANG ZI-WEI  , LIN CHENG-LU  , ZOU SHI-CHANG  ,   中国科学院上海冶金研究所离子束开放实验室
Published: November 2020

The damage and annealing behavior of Si implanted at room temperature with P2+ and P+ at different energies (5-600 keV) and intermediate dose (～1014/cm2) has been investigated. Experimental results show that the damage created by P2+ implantation is always greater than that of P+ implantation. The ratio of total displaced atoms of the target cuased by molecular and ND(mol)/ND(atom)reached a maximal value at 100 keV (P2+)and 50 keV (P+) after rapid thermal annealing, the carrier concentration profiles measured by spreading resistance measurement are also different for the P2+ and P+ implanted samples. We attribute essentially this phenomenon to the displacement spike, but the multiple collision effect and the interaction between two molecular fragments should be considered when the incident energy is high.
THE MECHANISM OF THE PROPERTY CHANGE OF THE MIXED Agl(Cr2A3) IONIC CONDUCTOR
Authors: WANG YU-XIA  ,   中国科学技术大学物理系
Published: November 2020

We study the infrared absorption spectrum, the ultraviolet and visible reflection spectrum of the Agl(Cr2O3) mixed ionic conductor, as well as its micro shape and result of composition analysis obtained with TEM. It is found that there exists some diffrence between Agl(Cr2O3) maxed ionic conductor and the pure Agl, Cr2O3 with microcosmic meticulous structure.A new model of the electrical medium is developed. According to the micro shape, we expect that the reason of the change in the microcosmic meticulous is the deformation electrical polorzation has been deformed. The mechnism of the property change of the AgI(Cr2O3) mixed inonic conductor is discussed.
FRACTAL GROWTH OF NICKEL-BASED ALLOYS IN THIN FILMS
Authors: HUANG LI-JI  , LIU BAI-XIN  , DING JU-REN  , LI HENG-DE  ,   (1)清华大学工程物理系; (2)中国高等科学技术中心《世界实验室》理论物理中心协联,成员
Published: November 2020

In this article, we report the formation of fractal structures in nickel-based alloy systems, in thin films during ion beam-solid interactions. The experimental results show that a necessary condition for the fractal growth in thin films is amorphous structural phase transition in the amorphous matrix. The fractal dimensions of the observed patterns depended on the specific alloy systems: Df = 1.4 for Ni-Zr system and Df=1.7 for Ni-Mo system. The relationship among ion-solid interaction, amorphous structural phase transition and the fractal growth in thin films is also discussed.
EXPERIMENTS OF PRODUCING SLOW POSITRON BEAM
Authors: HAN RONG-DIAN  , GUO XUE-ZHE  , WENG HUI-MIN  , XIE LI  , ZHANG SHAO-QIANG  ,   中国科学技术大学近代物理系
Published: November 2020

In this article, we describe an apparatus for producing a slow-positron beam by moderating the decay positrons from a radioactive source using a W-vane moderator. The integral energy spectrum of the slow-positrons was measured with a retarding field analyser. The results are compared with that obtained using a Ni+MgO moderator at the same apparatus.
PHONON SPECTRA OF Ge1-x Six MIXED CRYSTALS
Authors: FU YING  , XU WEN-LAN  ,   中国科学院上海技术物理研究所
Published: November 2020

With the model of five-atom clusters in virtual crystal background and the recursion method, we calculated the phonon spectra of Ge1-xSix mixed crystal. The developement processes of vibrational modes were analysed in detail.
OBSERVATION OF LASER-INDUCED SELF-DIFFRACTION FROM LiNbO3:Fe CRYSTAL
Authors: LIU SI-MIN  , ZHANG GUANG-YIN  , WU YUAN-QING  ,   南开大学物理系
Published: November 2020

We have observed very regular diffraction patterns on the screen behind the crystal when focusing He-Ne laser beam illuminates the thin sample along X or Y axis of the LiNbO3:Fe crystal. This is utterly diffent from photoinduotd light scattering phenomenon which arises from phase-noise-gratings produced by optical-induced refractive index change in the crystal, it had been observed long ago. This self-diffraction pattern can be explained by selfdiffrac-tion theory and complicated lens-like effect formed in the crystal when focusing laser beam illuminates it. These diffraction patterns can show the feature of optical-induced refractive index change in the crystal clearly, and the maximum of optical-induced refractive index change △n can be calculated directly from the number of diffraction ring. Furthermore, we have also studied and discussed the conditions of formation of laser-induced self-diffraction and its competition behavior with photo-induced light scattering.
A STUDY OF APPLICABILITY OF QUASI-GEOMETRIC APPROXIMATION ON CHARACTERISTICS OF TRANSVERSE MODES IN STABLE RESONATORS (Ⅰ)——G1=G2=0.5
Authors: LI ZHE-YIN  , XU JIA-JING  , LI XIAN-SHU  ,   (1)广州师范学院物理系; (2)中山大学物理系
Published: November 2020

The diffraction losses and phase-shifts of TEMpl modes in optical resonators are calculated by quasi-geometric approximation and by the matrix theory (a strict diffraction theory), and the values obtained from the two methods are compared and studied. We come to the following conclusions: (I) The relation of the diffraction losses with the phaseshifts differences between the values obtained from the two methods are close to exponential. (II) When the diffraction losses≥20%, the frequency degeneracy of TEMpl modes may be destroyed in a marked manner, and this would lead to the split of resonant frequency. (III) The exact diffraction loss values calculated from the strict method are nearly linear with the loss values calculated from the approximation method, its slope is b = 0.3559. When the Fresnel number of resonator ?> 2, all the conclusions are independent of mode numbers l, p, and Fresnel number ?. The above mentioned conclusions are obtained only for characteristics of transverse modes, whose losses≤99%, in axial-symmetric stable resonators G2 = G2= 0.5.
FOCUSING BEHAVIOURS OF THE DIFFRACTED BEAM OF SURFACE ACOUSTIC WAVE ON CHIRPED GRATING IN BRAGG REGIME
Authors: WANG ZUO-QING  ,   中国科学院声学研究所
Published: November 2020

The acoustic field distribution of the deflected wave beam in transmission region from a chirped acoustic grating is described by using Fresnel-Kirchhoff diffraction integral expression. The transmission function of the SAW beam which is diffracted by a linearly chirped grating in Bragg regime is obtained by using quasi-periodicity approximation and this function is considered as the field distribution function in the aperture of the exit plane. It is shown from the analysis that in Fresnel region there is a Fraunhofer plane where the field distribution is the Fourier transformation of the field along the aperture. It is demonstrated that the role played by the grating is two fold i.e. a deflector and a lens. The most important point we found is that the focusing axis of the focused wave beam will translate parallelly when the frequency of the input signal is changed. This scanning configuration is quite different from the traditional deflection scanning. The theoretical predictions are verified by experimental observations and measurements.
A STUDY OF STATE-SELECTED MULTIPHOTON IONIZATION OF FORMALDEHYDE
Authors: LIU HOU-XIANG  , LI ZHAO-LIN  , LI SHU-TAO  , HAN JING-CHENG  , WU CUN-KAI  ,   中国科学院安徽光学精密机械研究所
Published: November 2020

The parent ions (H2CO+) and the descendent ions (CO+) from higher energy dissociation channel, generated by 2+1 and 2+2 photon resonant excited processes respectively, have been found in the multiphoton ionization investigation on formaldehyde with XeCl excimer laser. No HCO+ ions from lower energy dissociation channel (which are dominant in both electron impact and single-photon ionization mass spectra) appear as a result of state-selective excitation.
A POSSIBLE PROPOSAL FOR THE CREATION OF UNIVERSE FROM VACUUM FLUCTUATION
Authors: LIU LIAO  , JIANG YUAN-FANG  , HUANG CHAO-GUANG  , QIAO ZHEN-HUA  ,   (1)北京师范大学物理系; (2)华东师范大学物理系; (3)中国科学院高能物理研究所
Published: November 2020

The success of the Big Bang model strongly suggests that the universe may be created, but whether the universe is created from nothing or from vacuum is a problem of controversy. In this paper, we put forth a possible proposal for the creation of universe from vacuum fluctuation. We note that the primordial inflationary universe-primordial de Sitter Universe, could be created from the vacuum fluctuation in one-loop approximation, wherce the SO11, SU14 or E8×E8 symmetry hold. By way of the asymptotic freedom of the gauge coupling g and Higgs self coupling λ, the primordial GUT breaks down and the latent heat releases during the first order phase transition. The released heat will heat the 'cold' universe to Planck temperature, so the created inflationary universe will pass into the standard model dominated by radiation. Thereafter, for example, the SU5 GUT holds and the well known second inflation will appear at 10-35 seconds after the creation.
A SLAVE-BOSON MEAN FIELD THEORY FOR THE TWO-CONDUCTION BAND LATTICE ANDERSON MODEL
Authors: XU WANG  , LI ZHENG-ZHONG  ,   南京大学物理系
Published: November 2020

A two-conduction band lattice Anderson hamiltonian is studied by the Slave-Boson technique and the functional integral method. The electronic density of states (DOS) of the system as well as low temperature thermodynamic quantities are obtained under the saddle point approximation. The results show that a pseudo-gap structure in DOS appears near the Fermi level due to the f-c hybridization and the coherence effect, and the low temperature thermodynamic quantities of the system possess the heavy-fermion properties.
MAGNETIC STUDY OF THE PSEUDOBINARY Dy(Fe0.9M0.1)2 (M= B, Al, Ga) COMPOUNDS
Authors: ZHONG WEN-DING  , LAN JIAN  , LIU ZUN-XIAO  ,   北京大学物理系
Published: November 2020

The magnetic properties of the pseudobinary compounds Dy (Fe0.9M0.1)2 (M = B, Al, Ga) have been studied. Substitution of M atoms for Fe atoms decreases the Curie temperature and varies the magnetic moment of the Fe atom. The coercivity of the samples increases very rapidly with decreasing temperature. This increase is considerably enhanced by the substitution elements. Anomalous phenomena and pronounced thermomagnetic history effects are observed in the temperature dependence of the magnetization. These effects may be explained by a local environment of iron atom and by an exponential increase in magnetic hardness on lowering the temperature.
A MONTE-CARLO SIMULATION STUDY ON THE INFLUENCE OF THE STRESS FIELD ASSOCIATED WITH A DISLOCATION ON CRYSTAL GROWTH
Authors: SHI YOU-CHUN  , LIU GUANG-ZHAO  , ZHONG WEI-ZHUO  ,   (1)中国科学院上海硅酸盐研究所; (2)中国科学院上海硅酸盐研究所,南京大学配位化学研究所
Published: November 2020

We use the stress energy function suggested by van der Hoek et al. to simulate the formation of dislocation hollow cores. Both average formation energy of the solid-fluid bond ω and driving force △μ affect the formation of hollow cores greatly. The relation between radius of hollow core and diffussion is expressed by the back-force effect. The results of our Monte-Carlo simulation show that a straight step passing a dislocation will be retarded by the stress field.
NEUTRON DIFFRACTION STUDY OF TETRAGONAL BARIUM TITANATE
Authors: JIANG YI-JIAN  , LI JING-ZHONG  , ZENG LING-ZHI  ,   (1)北京工业大学应用物理系; (2)中国原子能科学研究院
Published: November 2020

The crystal structure of tetragonal barium titanate (space group P 4 mm) was determined at 13.6℃, using the data collected by neutron four-circle diffractoraeter, R(F) = 0.0186. The O atoms near b sites distribute disorberly.
PHONON LOCALIZATION IN INHOMOGENEOUS DISORDERED SYSTEMS
Authors: PANG GEN-DI  , CAI JIAN-HUA  ,   (1)南京大学固体物理研究所; (2)上海交通大学凝聚态物理研究所
Published: November 2020

By the analogy between electron and phonon behaviors,results of renormalization study of the electron localization problem are used to obtain informations of phonon localization in inhomogeneous disordered systems. It is found that three mobility edges may appear in the phonon spectrum of such systems.
STATIC CHARACTERISTICS OF CIRCULAR SYMMETRIC ANNULAR JOSEPHSON JUNCTION (Ⅰ)——THE QUASI-DIFFRACTION CHARACTERISTIC AND THE SELF-FIELD EFFECTS
Authors: WANG WEI  , YAO XI-XIAN  ,   南京大学物理系
Published: November 2020

The static Josephson effects in the circular symmetric annular junctions are discussed in this paper. When the annular widths are smaller than λJ, analytic solutions of magnetic field dependence of the maximum Josephson current Im, are obtained. Because the external magnetic field is nonuniform distributed in the junctions, the minima of lm are not equal to zero. These results exhibit a quasi-diffraction characteristic. When the annular widths are larger than λJ, the numerical solutions of the self-field equations are obtained, which show the magnetic field dependence of the maximun Josephson current Im and the current distribution. Due to the 2-dimensional character, the points of maximum of Im are not on the axis where the external field is equal to zero in the plot of Im vs. IH.
LOCAL APPROACH FOR THE EXTENDED HUBBARD MODEL
Authors: NIE HUI-QUAN  , WEI GUO-ZHU  , ZHANG KAI-YI  ,   东北工学院物理系
Published: November 2020

In this paper, using the local approach, we calculated the correlation energy, the local moments and the polarisation around the local moments in paramagnetic phase up to second order in the extended Hubbard model. It is shown that the polarisation is always antiferro-magnetic for different values of W. The correlation energy increases with W increasing for n = 1 and large U. The local moments and the antiferromagnetic polarisation decrease with W increasing for fixed n and U. While the effect of W on both the local moments and the antiferromagnetic polarisation is not obvious for small n or for large U and n = 1.
THE STACKING FAULT GROWTH MECHANISM AND ITS KINETICS
Authors: MIN NAI-BEN  , I. SUNAGAWA  , K. TSUKAMOTO  ,   (1)南京大学物理系固体微结构实验室; (2)日本东北大学岩石矿物矿床研究所
Published: November 2020

The atomic configurations of sub-steps created on (111) growth surface of fee crystal by stacking faults with fault vectors 1/6〈112〉and 1/3〈111〉show that they can act as growth step sources. Growth kinetics of stacking fault growth mechanism has been analysed. It has been shown that the nucleation barrier at the sub-steps is always smaller than that of the 2-di-mensional nucleation.
CRYSTALLIZATION KINETICS OF QUASICRYSTALLINE DECAGONAL PHASE IN RAPIDLY QUENCHED Al80Mn20 ALLOY
Authors: WU QIN-CHONG  , WANG YUAN-SHENG  , WU ZI-QIN  , HE YI-ZHEN  ,   (1)中国科学技术大学; (2)中国科学院固体物理研究所
Published: November 2020

The crystallization kinetics of quasicrystalline decagonal phase in a rapidly quenched Al80Mn20 alloy has been investigated. The results of DSC experiments show that the activation energy for crystallization is a constant during the whole process. The experimental curve showing kinetic mechanism of crystallization has been obtained. The activation energy and frequency factor are determined to be 224 kJ/nol and 1.2×1012/s, respectively, The analysts of the kinetics indecates that the crystallization of decagonal phase is controlled by long range atomic diffusion, and the nucleation rate should be zero during the process.
MAGNETIC PROPERTIES OF AMORPHOUS Fe90-xMnxZr10 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 magnetic properties of amorphous Fe90-xMnxZr10 (X = 0, 4, 6, 10, 15) alloys prepared by the drum spinning technique are reported. The dependence of the average magnetic moment per atom μ and Curie temperature Tc on Mn content and the behaviour of the quasi-spin glass in these amorphous alloys are discussed. The magnetic phase diagram of amorphous FeMnZr alloys has been obtained. It is observed that the thermomagnetic curves show a irreversible variance in crystallized Fe84Mn6Zr10 alloy. This phenomenon may be originated from the α→γ phase and γ→α phase transformations at high and low temperatures, respectively.
LASER PULSE ANNEALING ION-IMPLANTED GaAs
Authors: LIU SHI-JIE  , S. U. CAMPISANO  ,   中国科学院高能物理研究所
Published: November 2020

Several surface properties of implanted GaAs after Nd:YAG and ruby laser annealing have been investigated by the techniques of RBS combined with channeling, Auger and X-ray photoelectron spectroscopy. The results indicate that recovery of the implanted amorphous layer exhibits a threshold and no appreciable surface decomposition occurs in narrow energy density window just above the threshold. High energy densities cause significant surface decomposition and damage. We calculate the redistribution by heat flow theory. High ratio of Te substitution in GaAs is obtained.
PHOTOVOLTAIC DETECTION OF MAGNETIC RESONANCE IN a-Si:H SOLAR CELL
Authors: YAN MAO-XUN  , WU SHU-XIANG  , XU HUI-YINC  , WU EN  , MAO JIN-CHANG  , LIN XUAN-YING  , ZHANG GUANG-HUA  , LIU JIA  ,   (1)北京大学无线电电子学系; (2)北京大学物理系
Published: November 2020

An investigation of spin dependent recombination processes in p+in+ a-Si:H solar cell by photovoltaic detection of magnetic resonance (PDMR) is reported. The study indicates that the PDMR signals for various solar cells made by different technology have different g-values and line shapes, so the dominant recombination processes are different. The influence of the speed of growth, substrate temperature and intrinsic thickness of a-Si:H film on solar cell properties is discussed in terms of the PDMR results.
LOCAL APPROACH IN THE HUBBARD MODEL
Authors: WEI GUO-ZHU  , NIE HUI-QUAN  , ZHANG KAI-YI  ,   东北工学院物理系
Published: November 2020

Based on the intraatomic electron correlation and the interatomic electron and spin correlation, the local approach has been used to the Hubbard model. The term〈OOH〉which was neglected in the general calculation is retained in our calculation. Camparing our results with those of the general calculation, we find that when U is large, the effects of the term〈OOH〉in the paramagnetic phase can not be heglected for calculating the correlation energy, the ground state energy, the local moments and the antiferromagnetic polarization around the local moments. To estimate more accurately the electron correlation effects, one has to calculate to higher orders and check he convergency of the series.
A POSSIBLE HEAVY-FERMION MECHANISM OF SUPERCONDUCTIVITY——ELECTRON-SLAVE BOSON SUPERCONDUCTING MECHANISM
Authors: FENG SHI-PING  ,   北京师范大学物理系低能核物理研究所
Published: November 2020

Using the Anderson lattice, the heavy-fermion superconductivity is discussed. In the long wavelength limit of Slave boson field, the mutual interaction between the same type quasipar-ticles is attractive by one-Slave boson exchange and the heavy-fermion superconductivity is induced by the first type quasiparticles-quasi-f electrons only.
CORRELATION INTERACTION IN ATOMIC INNER SHELL PHOTOELECTRIC EFFECT
Authors: WU YING-JIAN  , LI JIA-MING  ,   中国科学院物理研究所
Published: November 2020

Based on the Hartree-Slater self-consistent field theory, we considere the residual interaction which is omitted in obtaining the Hartree-Slater self-consistent field in previous calculation. We calculate the near threshold photoionization cross sections of K-shell of atomic Ne-and Ne+ ion and the cross section ratios as examples. We discuss the effects of residual interaction and compare our results with experiments.
AN APPROXIMATE SOLUTION FOR SQUARE-LATTICE SPIN-1 MODEL
Authors: YE QING  ,   上海交通大学应用物理系凝聚态物理研究所
Published: November 2020

In this paper, we apply the decoration and decimation transformation to the square-lattice spin-1 model and show that it is equivalent toa checkerboard Ising model with cross and four-spin interactions. Then, the approximate critical condition is obtained for the model and it reduces to Onsager's exact solution in the Ising-model limit.
MICROHARDNESS MEASUREMENT OF RARE EARTH PENTAPHOSPHATE CRYSTALS
Authors: LI BAO-XIANG  ,   中国科学院长春应用化学研究所
Published: November 2020

In this paper, the microhardness of LnP5O14 (Ln = La→Lu) crystals have been measured and discussed. The anisotropy of microhardness and the influence of temperature on microhardness have also been studied. These results indicate that the microhardness of crystals depends not only on the crystal structure and lattice energy but also on temperature.
ANELASTIC RELAXATION WITH INFRARED DIVERGENCE SUPERIONIC GLASSES
Authors: DING YI  , YU WEN-HAI  , WU KUN-YU  ,   (1)中国科学技术大学无线电电子学系; (2)中国科学技术大学物理系
Published: November 2020

Based on the characteristic of superionic glasses and the infrared divergence response theory, we studied the anelastic relaxation of amorphous superionic conductors. We consider that the ultrasonic attenuation of superionic glasses is due to the thermal active relaxation process of mobile superions bonded weakly to the glassy network and the accompanishing low energy excitation dissipation.The theory can explain the experimental characteristics which failed to be interpreted by previous theory with distributed relaxation times. Our predictions agree well with available experimental data.
THE MICROSCOPIC PHENOMENOLOGICAL THEORY OF ANALYSIS FOR THE PROBLEM OF NONEQUILIBRIUM FLUCTUATIONS (Ⅰ)——A NEW THEORY OF EXTENDED IRREVERSIBLE THERMODY-NAMICS AND NONEQUILIBRIUM CORRECTIONS OF THE FLUCTUATION-DISSIPATION EXPRESSIONS FOR THE HEAT FL
Authors: LI FU-BlN  ,   淮北煤炭师范学院物理系
Published: November 2020

This paper provide the microscopic phenomenological theory of analysis for the problem of nonequilibrium fluctuations, i.e. the statistical theory for description of nonequilibrium fluctuations. This theory is based on a generalized nonequilibrium entropy and an extension of the Einstein formula for the probability of the fluctuations. We obtain the second moments of nonequilibrium fluctuation of the specific energy and the heat flux in rigid heat conductors by calculation. This approach leads to nonequilibrium corrections to the conventional fluctuation-dissipation expressions for the heat fluctuations. The corresponding numerical corrections are obtained for phonon heat transport in dielectrics and for electronic heat transport in metals.
SINGLE ELECTRON CAPTURE INTO EXCITED STATES IN COLLISIONS OF Ar2+ WITH Li AND Na
Authors: LEI ZI-MING  , YANG FENG  , YU DE-HONG  , LIU JIA-RUI  , PAN GUANG-YAN  , SUN XIANG  ,   (1)中国科学院物理研究所; (2)中国科学院物理研究所,曲阜师范大学激光研究所
Published: November 2020

Absolute measurements of emission cross sections have been performed for the lines from Arll excited states in Ar2++Li and Ar2++Na collision. The energy of incedent ions ranged from 40 keV to 300 keV. The dependence of the emission cross sections on the energy defect △E is discussed. We find that the processes with intermediate △E(>0) have larger cross sections. We also find that the excited states correlated to the observed lines belong to the high J quantum numbers in an electron configuration.
EFFECT OF ELECTRON-MANY PHONON INTERACTION ON SCATTERING TIME
Authors: LIU FU-SUI  , FAN XI-QING  , LIU YAN-ZHANC  , WANG HUAI-SHENG  , RUAN YING-CHAO  ,   (1)北京大学物理系; (2)黑龙江大学物理系; (3)郑州大学物理系
Published: November 2020

A general approach for analysing the effect of electron-many phonon interaction on electron life time and the corresponding expressions are present for the case of temperature T》 Debye Temperatule TD. It is pointed out that the electron-many phonon interaction may be important for 90 K superconductivyty in Y1Ba2Cu3O7-δ.
A BASIC EQUATION AND ITS SOLUTION FOR SYNCHRONOUSLY PUMPED-PASSIVE MODE-LOCKED DYE LASERS
Authors: GUAN XIN-AN  , ZHAO ZHI-HONG  ,   南开大学现代光学研究所
Published: November 2020

Using the "self-reproducing profile model", we derive a basic equation for synchronously pumped-passive mode-locked dye lasers and an analytical expression for duration of the light pulses emitting from this lasers system. Based on these results, some characteristics of such a hybrid mode-locked lasers system are interpreted theoretically.
DISCRETE ELASTIC MODEL FOR CRYSTAL DISLOCATION——CORE STRUCTURE AND P-N FORCE
Authors: SUN ZONG-QI  , HAN MING-HUI  ,   中国科学院金属研究所
Published: November 2020

The effect of the distribution of dislocation density in the core region is taken into account in the discrete elastic approach. The self-energies, effective inner cut radii, as functions of the position of dislocation center are calculated for screw dislocations with different core structures in isotropic elastic fcc and bcc lattices. The P-N forces for different slip planes are estimated.The effect of the thermal motion of atoms on P-N force is discussed. This discrete elastic approach is compared with other methods. We believe that the discrete elastic approach is an effective method for comprehensive investigation
"HORN TIP" JET STRUCTURES IN LASER- PRODUCED PLASMAS
Authors: XU ZHI-ZHAN  , JIANG ZHI-MING  , CHEN SHI-SHENG  , LIN LI-HUANG  , ZHANG WEI-QING  , QIAN AI-DI  , ZHANG ZHENG-QUAN  , FAN PIN-ZHONG  ,   (1)中国高等科学技术中心(世界实验室)凝聚态与辐射物理分中心; (2)中国科学院上海光学精密机械研究所
Published: November 2020

By using multi-frame optical probing photography, we have discovered and investigated the large-scale "Horn Tip" plasma jet structures in the coronal region of line-focused laser-produced plasmas. These plasma jets always appear at the boundary between the hot plasma and the cold target material, or between two plasmas with different Z-numbers.
A NMR STUDY OF THE LI2O·P2O3·CdO GLASSES
Authors: LI ZI-YUAN  , JIANG DONG-YAN  , JIN QING-HUA  , DING DA-TONG  ,   南开大学物理系
Published: November 2020

31P nuclei are used as probes in the NMR studies of xLi2O·P2O5·yCdO glass samples with different molar ratio (x, y). The static NMR spectra are obtained through employing the Bruker MSL-300 spectrometer with a operating frequency of 121.487 MHz. Three basic types of phosphorous structure units join together randomly to form networks in the glasses, each of which has its own NMR characteristic. The relative portions of those basic structure units depend on the molar contents of Li2O and CdO, i,e x and y. For the description of the unit portions, we have postulated a simple model, the rationality of which has been justified by the coincidence between the theoretical prediction based on the model and the conclusions obtained from the simulation of the observed NMR powder patterns.
UNSTABLE REGION AND BIFURCATIONS AND CHAOS IN SINGLE-MODE BISTABLE OPTICAL SYSTEMS
Authors: MA WEN-QI  , YANG GUO-JIAN  , HU GANG  ,   (1)北京师范大学物理系; (2)吉林师范学院物理系
Published: November 2020

Based on the instability criterion of semi-classical Maxwell -Bloch equations of single-mode optical systems, the global distribution of instability region is depicted in △-θ parameter space (△ detuning of the atoms, θ mistuning of the cavity). In the instability region predicted, various bifurcations and chaos are disclosed. We find that chaos may appear in both upper and lower branches of one bistable curve Moreover, a new time-dependent solution coexisting with the stable stationary solution is found.
LEVEL STRUCTURE OF THE RYDBERG STATES OF CALCIUM ATOM IN ELECTRIC FIELD
Authors: ZHANG SEN  , QIU JI-ZHEN  , WANG GANG  ,   浙江大学物理系
Published: November 2020

The Stark spectrum of Ca atom with m = 0 in the vicinity of n = 10 to n = 13 have been obtained by using two-step excitation and photoionization methods in the applied electric field from 0 to 8 kV/cm. The experimental results show that the 3d2 3P0 and 3d2 3P2 valence states are repelled by n= 12 Stark manifold. The interaction among the zero-field non-degenerate states, valence states and Stark states are discussed. The interference phenomenon, in which valence state and Stark states take part, has been observed. The interference is enhanced when the electric field increase.