bluuebunny/crossref_metadata_2025 huggingface dataset:
SURFACE STUDY ON α-Fe2O3 ELECTRODE FOR PHOTODECOMPOSITION OF WATER
Authors: LIN ZHANG-DA  , CHENG YUN-QI  , WU SHU-YAO  , WU XIAO-LIN  , QI SHANG-XUE  , XIE KAI  ,   中国科学院物理研究所
Published: December 2020

We studied the surface of stoichiometric α-Fe2O3 sample bombarded by Ar+ ion beam, the Fe++ ion was identified on it and the surface was found to become FeO-like in property. In addition, the results of UPS and XPS analysis indicated that OH-existed on the FeO-like surface during water adsorption and the Fe++ was the active center of water decomposition. We propose that water molecules adsorpted onto the surface can preliminarily be seperated into OH- and H+ due to the catalysis of 3d electrons of Fe++ ions on the surface. So, in order to raise the efficiency of photo-decomposition of water, it is not only important to modify the band structure, but also to create Fe++ ions on the α-Fe2O3 surface.
A FURTHER INVESTIGATION ON THE MULTIPLIC-ATIVITY OF IMAGE-PLANE SPECKLE NOISE
Authors: LIU PEI-SEN  , QIN KE-CHENG  ,   (1)北京大学物理系; (2)北京工业学院光学工程系
Published: December 2020

In this paper, the multiplicativity of the partially polarized image-plane speckle noise is considered. After deriving the n-th order moment of the intensity of the speckled image, the multiplicative model of speckle noise is justified. The mean squared error of the model for partially polarized case is discussed. Finally, the validity of the multiplicative model for the incoherent superposition of n independent linearly polarized speckled images formed with identical illumination is treated.
THE QUANTUM GRAVITY WITH TORSION AND GHOST-FREE DE SITTER GRAVITY (Ⅰ)——GRAVITATIONAL FIELD WITH HOESION UNDER LINEAR COVARIANT GAUGE CONDITION
Authors: YAN MU-LIN  , GUO HAN-YING  ,   (1)中国科学技术大学近代物理系; (2)中国科学院理论物理研究所
Published: December 2020

Under a general linear covariant gauge condition, the propagators are calculated in a gravitational theory with torsion containing 17 parameters. It is showed that there are three terms in the Lagrangian having no contributions to the particle content of the theory. Jp=l- particle is a gauge-dependent non-physical particle, which does not effect whether the original Lagrangian is ghost-free and tachyon-free or not.
THEORY OF RESISTIVITY OF I-DIMEN-SIONAL MAGNETIC ALLOY
Authors: JIANG QI-DU  , LIU FU-SUI  ,   北京大学物理系
Published: December 2020

The contributions of sd interaction to the electrical resistivity of 1-dimensional conductor are considered in the case of single impurities and coupling impurities separately. In order to show the essence of the coupling, the 1-d RKKY interaction is derived. The qualitative discussions about the resistivity of 1-d magnetic alloy and the theoretical predictions about the resistivity-temperature curves in some eaces are made.
INVESTIGATION OF THE PSEUDO-BINARY SYSTEM Ba2CaWO6-Sr2CaWO6
Authors: FU ZHENG-MIN  , LI WEN-XIU  , XU PAN-XIANG  , ZHAN JING-ZI  , QI XIAO-ZHEN  ,   (1)北京市灯泡厂; (2)中国科学院电子学研究所; (3)中国科学院物理研究所
Published: December 2020

The phase equilibrium and transition in the pseudo-binary system Ba2CaWO6-Sr2CaWO6 have been investigated by means of DTA, X-ray powder diffraction, precise measurement of lattice parameters and other methods. A continuous solid solution was formed at high temperatures (above 860℃). At room temperature, a solid solution based on the structure of Ba2CaWO6 was formed on Ba2CaWO6-rich side and a solid solution with the structure of Sr2CaWO6 on Sr2CaWO6-rich side and a phase transition point was found at 25mol. per-cent of Ba2CaWO6.As a coating material for the filaments of high voltage sodium lamp, the important characters of BaxSr2-xCaWO6, the electron emission and the rise of the lamp voltage during multiswiching, were investigated. The best performance was found at the composition of BaSrCaWO6.
HYDROGEN DISTRIBUTION IN THE ION IMPLANTED SUPERCONDUCTOR PdCu AND ITS TRANSITION TEMPERATURE
Authors: WANG GUANG-HOU  ,   南京大学物理系
Published: December 2020

A new method of preparing superconducting PdCu alloy is ion-implanting Cu into Pd and subsequent electrolysis at room temperature, then hydrogen implanting at liquid nitrogen temperature. Thus we obtain the superconducting structure H/Pd55Cu45=0.7, which has the highest transition temperature of 17 K. The paper also gives some results of the distribution of hydrogen in the alloy and its effects on superconducting transition temperature, as well as experimental conditions, so that it provides some interesting informations about the investigation of the new method in preparing them.
INFLUENCE OF COLLECTIVE EFFECTS OF PLASMA ON THE INVERSE BREMSSTRAHLUNG ABSORPTION OF LASER LIGHT
Authors: CHANG TIE-QIANG  , NIE JING-ZHONG  ,   北京8009信箱
Published: December 2020

This article investigates the influence of collective effects of plasma on bremsstrah-lung. According to the theoretical results we obtained, the influences on the inverse bremsstrahlung absorption of laser light and the spectrum and total energy of spontaneous bremsstrahlung are studied numerically.
MAGNETIC SUSCEPTIBILITY AND THE SPIN-GLASS TRANSITION OF Zn1-x Mnx Se AT LOW TEMPERATURES
Authors: YANG YU-QING  ,   中国科学技术大学物理系
Published: December 2020

Low-field magnetic susceptibility of the diluted magnetic semiconductors Zn1-xMnxSe was measured between 4.2 and 30 K for the Mn concentration range 0.1≤x≤0.50 using SQUID magnetometer. When x≥0.30, the system shows a spin-glass transition in the above temperature range, as evidenced by a somewhat rounded cusp in the susceptibility. The transition temperature of spin-glass is as follow: x=0.30, Tf=10.5 K; x=0.40, Tf=16.0 K; x=0.50, Tf=19.5 K. The phase diagrams for the boundary of the paramagnetic and the spin-glass phases are obtained for this system. The difference of spin-glass transition temperature between Zn1-xMnx Se and Cd1-xMnxSe is discussed. It is found that for any given Mn concentration x the spin-glass transition temperature Tf of Zn1-xMnxSe is higher than that of Cd1-xMnxSe.
SOME ALTERNATIVE ACTIONS IN PURE LATTICE GAUGE THEORY
Authors: LI WEN-ZHU  , DONG SHAO-JING  ,   浙江大学物理系
Published: December 2020

In lattice gauge theory some alternative actions without fermions were proposed, which obey Wilson's conditions for lattice action and were related with usually adopted actions. The Schwinger-Dyson equation obeyed by Wilson loop amplitude with the alternative actions was derivated. We verified that, in large N limit in E-K reduced model, the same Schwinger-Dyson equation exists as in the standard model.
THE MECHANISM OF THE SECONDARY ION EMISSION INVESTIGATED BY THE EFFECT OF ENERGETIC ELECTRONS
Authors: ZHU ANG-RU  , WU XI-LIN  ,   复旦大学现代物理研究所
Published: December 2020

The surface potential of the sample was changed by the irradiation of energetic electrons. The energy spectra of varieties of sputtered ion species were measured with different surface potential. It was found that under conventional condition, particularly when there was oxygen enhanced emission, the resonant electron tunneling would not reduce the savival probability of sputtered ions. The energy spectra were also used to investigate the dynamic aspect of the ion emmission. The dynamic parameters indicated that the surface potential which the ion yield depended on was highly localized. In addition, the electron irradiation could be helpful in improving the quatitative analysis of the SIMS even for metals.
DISCHARGE CHARACTERASTICS OF HIGH PRESSURE FAST DISCHARGE XeCl EXCIMER LASER
Authors: LIU DA-WEI  ,   中国科学院力学研究所
Published: December 2020

Based on accurate measurements of voltage and current between electrodes of a fast discharge XeCl laser, together with computer analyses, the kinetic impedance of gaseous mixture at high pressure of 3 to 8 atmospheres under discharge was obtained. The high impedance droped down to a fraction of ohm within several nanoseconds. The discharge peak currents and corresponding impedances of laser cavity at various charge voltages and gas pressures were studied. The results show that it is impractical and unimportant to match precisely the impedances of discharge plasma and of transmission line.
A LASER PULSE METHOD FOR DETERMINATION OF ELECTRON SWARM PARAMETERS IN SF6-CO2
Authors: LI ZHENG-YING  ,   华中工学院
Published: December 2020

Described in detail in this paper is a useful method which can be used to study avalanches in electronegative gases and then to determine electron swarm parameters (ionization coefficient α, attachment coefficient η, and drift velocity v) including the number and distribution of primary electrons released from the cathode of a parallel electrode configuration by high energy laser pulses. The method has been used to study electron swarm parameters in mixtures of SF6 and CO2. Relations between the parameters (α/P, η/P and ν) and E/P (E=electric field, P=gas pressure) are given. A number above 108 of primary electrons has been obtained. The paper describes also the measurement system used in the study and improvements of the system that can be made.
KINETIC BALLOONING MODE ANALYSIS OF TOKAMAK PLASMAS WITH THE SECOND STABILITY REGIME INCLUDED
Authors: SHI BING-REN  , SUI GUO-FANG  ,   中国西南物理研究所
Published: December 2020

The kinetic ballooning-mode eigenequation, which can be used to study the stability criterion in the second stability regime, is derived. It retains various most important kinetic effects. The corresponding form of this equation for circular tokamak is deduced to include the effects of the magnetic surface displacement and the poloidal magnetic field that become important in the second stability regime. The structures of the modes and the stability criteria for various configuration parameters are studied by using a numerical shooting code. Compared to the ideal MHD case, it is found that a new unstable branch of the mode exists in the second stability regime, having a very weak growth rate. In addition, there are several sorts of marginal stable modes, their behaviours have been studied to examine the effects of the magnetic shear and the poloidal magnetic fields.
THE PYROELECTRIC RELAXATION EFFECT
Authors: LI JING-DE  ,   中山大学物理系
Published: December 2020

The homopolar charge and heteropolar charge appeared in polarized ferroelectric ceramics result in pyroelectric relaxation effect. Three types of relaxation process given by the phenomenological theory are observed. Since energy is needed for the excitation of homopolar or heteropolar charge, at times long after the temperature change of the ceramic, the pyroelectric charges decay slowly as △Q(t)=(1+r±e(-(α±t)1/2)△Q∞.The theory is in good agreement with all experimental data for dozens of kinds of ceramic which have been measured.
APPLICATION OF Fe-DOPED LiNbO3 CRYSTAL DEGENERATE FOUR-WAVE MIXING IN OPTICAL IMAGE PROCESSING
Authors: ZHANG HONG-JUN  , DAI JIAN-HUA  , WANG PENG-YE  , GAO CUN-XIU  , Lü TUAN-SUN  , LIU WEN-HU  , XU LIANG-YING  ,   (1)福建师范大学物理系; (2)中国科学院上海硅酸盐研究所; (3)中国科学院物理研究所
Published: December 2020

This paper reports a degenerate four-wave mixing effect in Fe-doped LiNb03 crystal at low laser power (He-Ne laser, λ=6328?). The experimetal curves about intensity of conjugate wave vs. irradiate time at different pump power is given. The phase-compensated property of the conjugate wave was examined, and the phase distortion image was corrected by means of this property. The experimental results obtained agree with the theory.
OPTICAL REALIZATION OF COHERENT WALSH TRAN-SFORMATION BY A SINGLE ELEMENT
Authors: WANG YU-TANG  , LI XIU-YING  , JIANG CHANG-SHAN  , CHEN YAN-SONG  ,   中国科学院物理研究所
Published: December 2020

2-dimensioal Walsh transformation is realized by coherent optical system Composed of a single transform element. The element is made using a method of scanning-exposure. This optical system has higher efficiency and simple structure. The principle and experimental results are presented.
LASER ISOTOPE ENRICHMENT VIA MAGNETIC DEFLECTION OF OPTICALLY POLARIZED ATOMIC BEAM
Authors: ZHU XI-WEN  ,   中国科学院武汉物理研究所
Published: December 2020

We describe a novel method to enrich isotopes and isomers via magnetic deflection of optically polarized atomic beam. High electronic polarization with opposite signs for atoms of both isotopes respectively is achieved by selective optical pumping using lasers with different frequencies and polarizations and then the isotopes are enriched by deflecting the oppositely polarized isotopes along different directions by the inhomo-geneous magnetic field in the spin selective magnet. Separation selectivity and throughput are evaluated and the advantages, disadvantages and prospects of possible application of the present method are discussed in comparison with other existing methods. Experimental scheme with lithium or potassium is suggested.
THE APPROXIMATE EXPRESSIONS OF THE FOUR LAYER ASYMMETRIC WAVEGUIDE CHARACTERISTICS
Authors: WANG DE-NING  , PAN HUI-ZHEN  ,   中国科学院上海冶金研究所
Published: December 2020

In this paper, based on the normalized electronic field and the eigenvalue equation for the four layer asymmetric structure, the approximate expressions of the normalized effective index and the radiation confirement factor were introduced, and the approximate equations for the near field and far field asymmetric Gaussian Profile were deduced.Using the above-mentioned analysis, the dynamic characteristics of the four layer asymmetric waveguide was investigated. From this, the analytic expressions of the injected carrier concentration profile and the gain profile were obtained, and the modal gain, the threshold current density, the optimal active layer thickness, and the optimal threshold current density can be calculated.The calculated results of a series of relation were discussed. We study further the structure parameter effect on the device.
ON THE HIGH ORDER OPTICAL PROPERTIES OF NARROW-GAP SEMICONDUCTOR IN A MAGNETIC FIELD (Ⅰ)
Authors: LIU SHU-ZHENG  ,   北京大学物理系,中央广播电视大学
Published: December 2020

In this paper, we have calculated the energy levels and wave functions, selection rules of two-photon fransition and two-photon magnetoabsorption of narrow-gap semiconductor in a magnetic field. The comparison of theoretical result and experimental spectra is given.
BOUNDARY EFFECTS ON THE EIGENSTATES OF DISORDERED SYSTEMS
Authors: WU SHI-YU  , ZHOU ZI-FANG  ,   (1)Department of Physics,University of Louisville,Louisville,KY 40292,U. S. A.; (2)中国科学技术大学近代物理系
Published: December 2020

A careful analysis of the boundary effects on the eigenstates of a disordered system when it is embeded in an ordered system was carried out. It was found that the properties of the system in the region whose distance from the boundary is greater than the localization length of the system can be reproduced. This then suggests a convenient way to study the eigenstatea of disordered systems.
FULL QUANTUM THEORY OF OPTICALLY PUMPED THREE-LEVEL LASER
Authors: GUO GUANG-CAN  ,   中国科学技术大学物理系
Published: December 2020

The Langevin quantum theory has been used to treat the optically pumped three-level laser system. We derive an equation of motion for laser field in the type of Van der Pol equation when the photon number of the laser field is not too high. It includes not only both incoherent and coherent pumping, but also both strong and weak optical pumping. If an average over reservoir is taken, the equation will give all the semi-classical results. Our results show that the laser gain comes from two basic processes, i.e., a two-photon process and a two-step process. When the pumping strength is larger than some value, the dynamic Stark effect will appear. The laser linewidth is mainly contributed by the thermal noise, the vaecum fluctuation, the spontaneous emissions between the laser levels and the spontaneous Raman scattering.
BEAT IN OPTICAL PUMPING EXPERIMENT
Authors: LIU SHU-QIN  , DONG TAI-QIAN  ,   北京大学
Published: December 2020

When two microwaves with frequencies close to each other are applied simultaneously to a 87Rb gas cell, which is optically pumped by 85Rb lamp, the beat in the resonance signal of 0-0 transition of 87Rb gro und state is observed. Theoretical explanation is presented.
ACCURATE AND QUICK SETTING OF MAGIC ANGLE
Authors: YE CHAO-HUI  , QIU JIAN-QING  , LI LI-YUN  , SUN BO-QIN  ,   中国科学院武汉物理研究所
Published: December 2020

The FID arising from the quadrupole interaction is broken into a rotational echo train under the slow rotation condition, and the number of these echoes increases when adjusting the angle between the rotational axis and the applied magnetic field towards the Magic Angle. Thus, a accurate and quick setting of the Magic Angle in MAS-NMR experiments can he easily obtained by this phenomenon. It is theoretically explained by analysing the FID of a spin-1 system. The setting accuracy within 0.05°with a per-deuterated HMB sample is experimentally demonstrated.
CRYSTAL GROWTH AND OPTICAL AND ELECTRIC CHARACTERISTICS OF 2KIO3·HCI SINGLE CRYSTAL
Authors: HU BO-QING  , LI YONG-JING  , ZHOU TANG  , ZHANG DAO-FAN  ,   中国科学院物理研究所
Published: December 2020

The grown condition in aqueous solutipn,morphology and polarity of 2KIO3·HC1 single crystal were studied. The transmissivity, the position of optical indicatrix in the crystal and the indices of refraction were determined and discussed. The phonomenon of phase match SHG of 1.06μm from YAG laser was observed. Its pyro- and. piezoelectric, dielectric characteristics and conductivity were determined. The anisotropy of the single crystal is interest.
ELECTRON STIMULATED ADSORPTION STUDY OF OXYGEN ON InP CLEAN SURFACE
Authors: YU MIN-REN  , WANG HONG-CHUAN  , FANG ZHI-LIE  , HOU XIAO-YUAN  , WANG XUN  ,   复旦大学
Published: December 2020

The interactions of H2O and O2, with InP clean surface in the high vacuum chamber have been studied by means of Auger electron spectroscopy. It has been found that the water vapor plays a significant role responsible to the electron stimulated adsorption of oxygen than the pure oxygen. The In and P Auger signals change substantially during the oxygen adsorption process which is accessible as an occurence of electron stimulated oxidation (ESO). The oxygen atoms bond only with surface In atoms but not with P at the earliest stage, then they penetrate into the bulk and conbine with both In and P continually making the surface layer convert into oxide with an almost constant oxidation rate. As compared with the Auger depth profiling of InP native oxides, the similarity of the ESO and the ordinary oxidation processes is obvious. But the electron stimulated adsorpted oxygen could not fully oxidize the phosphorus in the surface layer while thermal oxidation and anodic oxidation do, the P concentration in the ESO oxide is higher than that in the thermal oxide but lower than the anodic oxide.
THE RENORMALIZED VACUUM STRESS-ENERGY TENSOR OF de SITTER SPACE-TIME
Authors: YU NAI-CHANG  ,   北京师范大学物理系
Published: December 2020

By applying Gilkey's result, we obtain the coefficient α3 in DeWitt-Schwinger proper time expansion of the Green function for scalar, spinor and vector fields respectively, so finally we succeed in obtaining the renormalized vacuum stress-energy tensor for deSitter space-time in large mass approximation.
VIBRATIONAL ENERGY TRANSFER STUDY OF DICHLOROMETHANE (CH2Cl2) BY LASER INDUCED FLUORESCENCE METHOD
Authors: GAO WEN-BIN  , SHEN YU-QI  , J. H?GER  , W. KRIEGER  ,   (1)Max-Planck-Institut für Quantenoptik,D-8046 Garchinn,Federal Republic of Germany; (2)中国科学院安徽光学精密机械研究所
Published: December 2020

In this work, the vibrational energy transfer of organic molecule CH2C12 was studied with laser induced fluorescence method for the first time. The activation and deactiva-tion rate constants of modes ν3 and ν3/ν9 of pure CH2C12, as well as the effect of rare gases on the deactivation processes for ν3/ν9, were obtained. The relative propablities of energy transfer from ν3/ν9 vibrational modes of CH2Cl2 to translational degree of freedom were calculated by means of SSH theory for the collision relaxation processes of CH2Cl2-rare gas mixtures. A vibrational energy transfer channel in CH2C12 is also discussed.
INFRARED DIVERGENCE THEORY OF ULTRASONIC ABSORPTION IN GLASSES
Authors: FAU XI-QING  , WANG GUO-LIANG  , JIANG WANG-YE  , DAI PEI-YING  , LIU FU-SUI  ,   (1)北京大学物理系; (2)郑州大学物理系
Published: December 2020

Starting from the unified theory of low-frequency fluctuation, dissipation, and relexation processes, we studied the ultrasonic absorption in the thermal activation pro-cess in glasses. The theory involves only a single relaxation time and differs from the theory of distributed relaxation times. Nontheless, it can explain the experimental cha-racteristics of the ultrasonic absorption in glasses and the universality of these charac-teristics independent of kinds of materials, which couldn't be interpreted by the pre-vious theory with the distribution of relaxation times.
INVESTIGATION OF CO AND NO CHEMISORPTION ON THE Ⅷ GROUP TRANSITION METAL SURFACE BY Xα-DV METHOD(Ⅰ)——ELECTRONIC STRUCTURE OF CHEMISOPTION OF CO ON Rh(111) SURFACE
Authors: CHEN YUN-QI  , ZHENG DE-JUAN  , CAO PEI-LIN  , WU YUE  ,   (1)浙江大学物理系; (2)中国科学院物理研究所
Published: December 2020

In this paper, the electronic structure of chemisorption of CO on Rh(lll) surface (θ≤l/3) has been calculated by the method of the self-consistent Hartree-Fock-Slater molecular cluster. The variation of the energy levels and total energy with respect to the vertical distance of the CO molecule above this surface is obtained. The optimized bond distance determined from the total energy curve is 1.85 ?, which is quite close to experimental result 1.95±0.1?. The binding energy is 0.98 eV, which is smaller than the experimental adsorption energy of 1.3 eV. The total density of states with above bond distance is calculated and it is in good agreement with the UPS result considering final state and relaxation effect. The bonding and antibonding character for the CO valence level have also been studied by analysis of the variations of the molecular eigenvalues when the CO molecule approaches the surface. The charge transfer for CO chemisorption on transition metal Rh is investigated through a Milliken population analysis and the analysis of coefficients of cluster wavefunction which is expanded by using CO molecular wavefunction. This charge transfer causes the activation of absorbed CO molecules.
EXPERIMENTAL INVESTIGATION OF INSTABILITY AND CHAOS ON THREE MODE He-Ne(6328?) LASER
Authors: LU KE-CHENG  ,   南开大学物理系
Published: December 2020

Instability and chaos in a three-mode He-Ne (6328?) laser was studied by varying discharge current and cavity length. Period doubling, two-frequency and intermit-tency routes to chaos have been observed.
MAGNETIC PERMEABILITY RELAXATION IN AMORPHOUS Fe82Si5B13 ALLOY
Authors: ZHANG YAN-ZHONG  ,   上海钢铁研究所
Published: December 2020

The kinetic behavior of the isothermal relaxation of the magnetic permeability has been investigated for the amorphous Fe82Si5B13 alloy in the range 0-300℃. Four relaxation peaks are observed on the isochronal relaxation spectrum for as-quenched alloy. The overale relaxation usally consists of both the ordinary disaccommodation and the continuous permeability decay, they are reversible and irreversible with respect to demagnetization, respectively. The calculations or the distributions of the relaxation time and the activation energy show that they have a broad distribution. The most probable activation energies for disaccommodation and decay are about 1.0 eV and 1.4 eV, respectively. A cross-over effect in the decay is observed for annealed sample.
STUDY MAGNETISM BY MAGNETOSTATIC WAVES
Authors: ZHANG PENG-XIANG  , CAO KE-DING  ,   中国科学院物理研究所
Published: December 2020

We constructed a device to excite and detect magnetostatic modes in. slab ferrite samples for frequency range of 2-8GHz. Using this device, we set up a system to measure relation between frequency and applied magnetic field for magnetostatic waves. This system can be used to study not only the magnetostatic waves, but also the basic properties of ferrites. It is similar to FMR. However, the samples need not to be put into a microwave cavity, thus the system allows one to make measurements during some sample treatment.
THERMODYNAMIC PROPERTIES OF THE ONE-DIMENSIONAL EXTENDED HUBBARD MODEL(Ⅰ)——U>0
Authors: XU HUI  , ZHANG KAI-YI  ,   (1)东北工学院物理系; (2)中南矿冶学院数理系
Published: December 2020

A perturbation expansion for the thermodynamic potential is performed to the third order by HTSE method. Entropy, internal energy, specific heat, and magnetic susceptibility of the one-dimensional extended Hubbard model are computed as functions of temperature, electron density, and t, U, W. Thermodynamics can be discussed in two temperature regions. The high T-region corresponds to increase in number of double occupied states. The low T-region corresponds to the distribution of electron spin. The effect of t on thermodynamic properties is obvious.
A MODEL FOR LOCAL MAGNETIC MOMENT AND ITS DELOCALIZATION OF f ELECTRONS IN METALS (Ⅰ)
Authors: CHEN CHANG-FENG  , ZHANG LI-YUAN  ,   北京大学物理系固体物理研究所
Published: December 2020

In this paper we suggest a model in which f electrons are bound in a narrow band near Fermi level, s-p-d electrons are regarded as free, and hybridization between them is considered. Numerical results show that certain stability of f electrons exists under delocalization and is dramatically influenced by temperature and hybridization. Phase diagrams in different parameter spaces are plotted. Finally the case of intermediate valence in RE is discussed qualitatively.
NEW GENERAL METHOD OF X-RAY DIFFRACTION QUANTITATIVE PHASE ANALYSIS WITHOUT STANDARDS
Authors: GUO CHANG-LIN  , YAO GONG-DA  ,   中国科学院上海硅酸盐研究所
Published: December 2020

In this paper, a new general method of X-ray quantitative phase analysis without standards is presented. The limit conditions that the phase composition of each of the reference samples and the analysis sample must be equal in Zevin's method are no more to be required. When the analysis sample contains n0 phases, each of the reference samples could contain less or more phases than n0. Hence, our new method is more general. The quantitative methods in both cases of known and unknown mass absorption coefficients are discussed. Practical quantitative analysis have proved that, the new method is quite explicit and applicable as well as gives quite precise and satisfactory quantitative analysis results.
STRUCTURAL RELAXATION OF AMORPHOUS ALLOYS Fe13.3Ni69.6B16.2Si0.9
Authors: CHEN JIN-CHANG  , SI HUNG  , ZHAN WEN-SHAN  , SHEN BAO-GEN  , ZHAO JIAN-GAO  ,   (1)冶金部钢铁研究总院; (2)中国科学院物理研究所
Published: December 2020

Structural relaxation kinetics and reversible relaxation processes of amorphous alloys Fe13.3 Ni69.6 B16.2 Si0.9 are discussed in this paper. Changes in the Curie temperature, Tc, due to various heat treatments are studied. It is found that Tc approaches equilibrium values after prolonged annealing, and the relaxation kinetics can be described by the relaxation time spectrum. Relaxation relaxation process can be explained by CSRO, and we note that the reversible change in one property does not imply that the change of entire structure is reversible.
THE MEASUREMENTS OF SOFT X-RAY FLUCTUATIONS ON THE HT-6B TOKAMAK DEVICE
Authors: LI LIN-ZHONG  , WANG ZHENG-MIN  ,   中国科学院等离子体物理研究所
Published: December 2020

In this article the construction of measurement system on IIT-6B Tokamak which is highly sensitive to soft X-ray fluctuation is described and the primary results presented. When the average electron temperature Te is less than 100 eV, the wave shapes of typical soft X-ray fluctuations, the disruptive instabilities, the MHD disturbances, and some other interesting phenomena have been observed.
SCALING THEORY OF ANDERSON LOCALIZATION IN DISORDERED SYSTEMS WITH SPACE MODULATIONS A REAL SPACE RENORMALIZATION GROUP APPROACH
Authors: XIONG SHI-JIE  , CAI JIAN-HUA  ,   南京大学固体物理研究所
Published: December 2020

We developed a method of real space renormalization group transformation, suitable to handle a variety of space-modulated disordered systems. By this method, maintaining the relative space-modulation structures unchanged under transformation, we could study the critical properties of Anderson localization of these systems. By solving the RG equations for disordered metallic superlattices with finite-lattice approximation, the fixed point and critical exponent have been calculated approximately. It is found that space-modulation may change the properties of electronic localization in disordered systems to some extent.
THE INFLUENCE OF SMALL METALLIC PARTICLE ON THE TUNNELLING PROPERTIES
Authors: PANG JING-ZHONG  , GONG CHANG-DE  ,   南京大学物理系、固体物理研究所
Published: December 2020

The effect of size and temperature on the quasiparticle density of state in small superconductorsty have been calculated by using the functional integral method. The influence of small particles embeded in oxidic layer of tunnelling junction on the Jose-phson current have also been investigated. An anomaly exhibits in the supercurrent. In addition, the quasiparticle currents of the junction have been calculated, the results obtained are consistent with the experiments.
FAR INFRARED ABSORPTION OF MIXED CRYSTALS Cd1-x MnxTe
Authors: SHEN XUE-CHU  , YE HONG-JUAN  , KANG LI-XUE  , TAO FENG-XIANG  ,   中国科学院上海技术物理研究所
Published: December 2020

We report here the results of far infrared absorption on spectra of mixed crystal Cd1-xMnxTe with different compositions x in wavenumber region of 20 to 400cm-1 and temperature region of 4.2 K to 300 K. The CdTe-like, MnTe-like reststrahlen bands and their LO-TO splitting have been resolved. A low frequency absorption band for all the samples and a quasi-local mode absorption peak for the sample with low x value have been found for the first time in the low frequency side of reststrahlen band. In addition, several two-phonon bands have also been observed on both sides of reststrahlen band. The appearence and the position of the quasi-local mode have been estimated with the lattice dynamics of defects. Other absorption bands and their probable origin have also been discussed.
LUMINESCENCE STUDIES OF Er3+ IONS IN FLUORIDE,FLUOROPHOSPHATE AND PHOSPHATE GLASSES
Authors: ZHENG HAI-XING  , WU GUANG-ZHAO  , GAN FU-XI  ,   中国科学院上海光学精密机械研究所
Published: December 2020

Absorption spectra, emission spectra and excitation spectra of Er3+ ions in fluoride glasses, fluorophosphate glasses and phosphate glasses were measured. The influence of glass hosts on the luminescence of Er3+ ions was explained. The effects of temperature and ion concentration on the luminescence of Er3+ ions in these host glasses were investigated, and the discussions about the intrinsieal and internal energy transfer of Er3+ ions were presented.
SURFACE ENHANCED RAMAN SCATTERING FROM BENZOIC ACID, SALICYLIC ACID AND P-HYDROXYBENZOIC ACID IN Ag COLLOIDS
Authors: ZHANG PENG-XIANG  , GAO XIAO-PING  , ZHUANG WEI-PING  ,   中国科学院物理研究所
Published: December 2020

We studied surface enhanced Raman scattering (SERS) from Benzoic Acid (BA), Salicylic Acid (SA) and P-Hydroxybenzoic Acid (PHBA) in silver sols. The enhanced Raman spectra are recorded and analyzed. The three molecules all contain vibration of ν(C-CO2-) and two of them (SA and PHBA) contain vibration of ν(C-OH), but located at different position. Making use of this situation, we analyzed the dependance of enhancement factor on the distance and orientation of the vibration dipoles relative to the surface and also compared with the pure electromagnetic model for SERS. An apparent discrepancy were revealed. The possible origins are disscussed. We also discussed the influence of coagulation of silver particles on the enhancement factors and pointed out the way for optimizing the enhancement in silver colloid.
ELECTRONIC STRUCTURE OF THE DIVACANCY IN CUBIC SEMICONDUCTORS (Ⅲ)——WAVEFUNCTIONS OF THE DIVACANCY STATES IN SI
Authors: REN SHANG-YUAN  , MAO DE-QIANG  , LI MING-FU  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学研究生院
Published: December 2020

The wavefunctions of the Eu, state and the Eg state are evaluated for the ideal divacancy in Si, using the basic equations given in [1] and the tight binding Hamiltonian given by P. Vogl et al. Comparison between the culculated results and the ESR and ENDOR spectra of V2+ and V2- in Si is discussed.
CALCULATION OF ENERGY VALUE OF STARK SUB-LEVELS IN LaF3:Nd3+
Authors: HUA DAO-HONG  , JIANG JIE  , LI DA-FEN  , MA DONG-PING  , XU YI-SUN  , SONG ZENG-FU  ,   (1)北京大学物理系; (2)四川工业学院
Published: December 2020

This is the first theoretical calculation covering the whole energy range in LaFa3Nd3+ by using a crystalfield Hamiltonian of C2 point symmetry. The rms deviation is about 20.2 cm-2. Thus far, this calculation is the most accurate one. We also correct the previous assign ments of some sub-levels.
INFLUENCE OF HYDROGEN ON THE MAGNETIC AND ELECTRONIC TRANSPORT PROPERTIES OF Y5Ni95 AMORPHOUS ALLOY FILMS
Authors: WANG YI-ZHONG  , FENG MIN-YING  , GONG WEI  , WANG ZHEN-XI  , J. P. REBOUILLAT  ,   (1)法国国家科研中心奈耳实验室; (2)中国科学院物理研究所
Published: December 2020

The amorphous Y5Ni95 alloy films were hydrogenated bv electrolysis. The dependences of magnetization, resistivity and Hall resistivity on H content were measured respectively for a-Y5Ni95Hx in the temperature range from 1.5K to 400 K. Results show that the average moment at 0 K, the Curie temperature and the temperature coefficient of resistivity decrease with increasing H content. While the high field susceptibility, resistivity and extraordinary Hall coefficient increase quickly. These effects of hydrogen are discussed in terms of the current theories.
LOW TEMPERATURE MAGNETIC PROPERTIES OF AMORPHOUS Sm-Fe AND Sm-Co THIN FILMS
Authors: DAI DAO-SHENG  , FANG RUI-YI  , LUI ZUN-XION  , WAN HONG  , LAN JIAN  , RAO XIAO-LEI  , JI YU-PING  ,   北京大学物理系
Published: December 2020

The low temperature magnetic properties of the amorphous Sm-Fe and Sm-Co thin films are investigated. It is found that there exists a distribution of the orientation of the Fe atomic moment in the Sm-Fe films, and the compositional dependence of the effective magnetic moments of the Co atoms in the Sm-Co films is very similar to that of the amorphous Nd-Co films. The magnetic structures of these two alloy systems are determined: there are asperomagnetic structure for the Sm-Fe thin films and the collinear ferromagnetic structure for the Sm-Co thin films. The magnetic moment of Sm atoms is very close to zero. The strength, temperature and compositional dependences of coercivity for these two amorphous alloy systems are measured. The Hc of Sm-Fe films is much larger than that of Sm-Co films, For the Sm-Fe amorphous films, Hc increases very quickly with increasing of the contants of samarium, and severely drops with increasing of temperature in the very low temperature region. But for the Sm-Co amorphous films, Hc reaches a maximum at about 43 at% Sm, and decreases with increasing of temperature in the exponental form. It is also found that the temperature dependence of magnetization in the low temperature region may be caused by the Bloch spin-wave excitation and Stoner electric excitation simultaneously.
A THEORY FOR DIFFUSION AND RELEASE OF IRERT GASES IN SOLIDS
Authors: XIA YUE-YUAN  , TAN CHUN-YU  , LIANG WEN-KANG  , SUN XIU-FANG  ,   (1)山东大学计算机科学系; (2)山东大学物理系
Published: December 2020

A model is proposed to describe the diffusion and release behaviour of inect gases implanted into various solids. According to this model, in which the interactions between different defects or radiation damage and the inert gas atoms are taken into account, a set of diffusion equations is derived and the analytical solutions of these equations are obtained.The comparison between the theoretical results and the experimental results shows that this model can be used to describe the release of inert gases from the surfaces of solids very well. By least-squares fitting the theoretical release curve to that of the experiment, a method to determine the activation energies of different trapping centres and the trapped concentration is provided.
RAMAN-SPECTROSCOPIC STUDY OF FERROELASTIC PHASE TRANSITION IN LANTHANUM PENTAPHOSPHATES
Authors: CHEN TING  , HONG GUANG-YAN  ,   (1)南开大学物理系; (2)中国科学院长春应用化学研究所
Published: December 2020

The soft optic mode spectra of monoclinic I lanthanum pentaphosphates LnP5O14(Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb) are measured in the range of 20-300℃. The Ag-B2g and Ag-Ag soft modes in different LnP5O14 all soften to 20 cm-1 at ferroelastic transition temperature Tc. Another Bg-B3g soft mode softens to 38cm-1 at Tc. The coupling of Ag-B2gsoft mode with e5, plays an essential role in the phase trasition and the temperature dependence of soft-mode intensity can be described by means of the bilinear mode-coupling model. The increment of Tc from La to Tb in this system is owing to the lanthanum contraction.
EXCITON SPECTRUM OF COLLOIDAL CuClxBr1-x(x=0-1) IN GLASSES
Authors: LEI WEI-GUO  , YIN BAO-ZHONG  , HUNG XI-HAI  ,   中国科学院上海硅酸盐研究所
Published: December 2020

Clusters, which do must not have the same periodic structure as the corresponding large crystal, can also show an optical absorption similar to the crystal. In the present article, we report the results about the preparation and optical absorption properties of glasses containing CuClxBr1-x(x=0—1) colloids. Experimental results indicate that colloidal CuCl, CuClxBr1-x and CuBr in glasses with definite size can also show exciton absorption peaks similar to the corresponding large crystals, and that glasses have the same violet absorption edges as the crystals.
DIFFRACTION CRRELATION AND LAU INTERFEROMETRY
Authors: LIU LI-REN  ,   中国科学院上海光学精密机械研究所
Published: December 2020

The operation of diffraction-limited misfocused correlator is analysed in terms of a model of off-axis optical Fourier-transformation system and the theory of Fresnel diffraction. It is proven that correlation still remains but between the intensity transmittance of the first transparency and the intensity diffraction pattern, of the second. The diffraction correlator can be modified as an interferometer, a general theory is deduced for it. The interferometry using two Ronchi gratings is discussed in detail, that yields lateral shearing interferogram, some corresponding experiment results are also given.It can be seen that the diffraction correlator is the setup of Lau effect for any plane objects and for any observating distance. Thus its application for interferometry is just as the interferometer directly based on the Lau effect.
MULTILAYER ANALYSIS OF DAMAGE PROFILE IN ION IMPLANTED SILICON BY OPTICAL SPECTROMETRY
Authors: HE XING-FEI  , MO DANG  ,   中山大学微电子研究所
Published: December 2020

The damage profile of ion implanted silicon can be calculated from the spectroscopic elli-psometric data as well as the optical constants of crystalline and ion implanted amorphous state of silicon by means of optimization with a multilayer model. We measured the ellipsometric spectra and optical constants of ion implanted samples in the spectral range from 2.1 to 4.6 eV In the sense of optical characteristics, the degree of damage is defined using complex refractive index. We performed the calculation of damage profiles of 40 keV As+ implanted Si 〈111〉 at dosage of 4×1013 and 1.4×1014 ion cm-2, respectively, on the basis of simulated tests. The depth profiles of damage were obtained and compared with the experimental results of He+ back-scattering. The method of multilayer analysis can also be used to determine the profiles of other parameters of interest from optical spectra as long as the parameters markedly influence the optical response and do not depend upon the photon energy.
TEMPERATURE DEPENDENCE OF THE ANISOTROPY CONSTANTS K1 AND K2 OF R2Fe14B(R=Ce, Pr, Gd)
Authors: XU WEN-GE  , LIU YING-LIE  , JI SONG-QUAN  , CHU DA-PING  , XU YOU  , YANG GUI-LIN  ,   (1)南京大学物理系; (2)中国科学院物理研究所
Published: December 2020

The temperature dependence of the anisotropy constants K1, K2 and the anisotropy field HA. of R2Fe14B (R = Ce, Pr, Gd) have been measured in temperature range of 1.5 K to 300 K. And the contribution of Pr3+ ions to the magnetocrystalline anisotropy of Pr2Fe14B compound was calculated by the single ion theory. The result is semiquantitatively consistent with the experiment.
EXPERIMENTAL INVESTIGATION OF STABILITY OF PLANAR CRYSTAL-MELT INTERFACE AND EVOLUTION OF CELLULAR INTERFACE DURING CZOCHRALSKI GROWTH OF LiNbO3 SINGLE CRYSTALS DOPED WITH YTTRIUM
Authors: MING NAI-BEN  , ZHOU FANG-QIAO  ,   (1)华中工学院固体电子学系,武汉; (2)南京大学物理系
Published: December 2020

By using periodic rotational striations as a time marker, the initial instability of a planar interface and the development of the cellular interface have been studied in Czochralski growth system of anisotropic LiNbO3 crystals doped with yttrium. The critical condition for very birth of instability of planar interface has been obtained. And there are two kinds of initial perturbations to be observed, that is, sinusoidal perturbation and sinusoidal travelling wave perturbation. Experimental results revealed that the planar interface evolves from sinusoidal perturbation to facetted perturbation to coarse facetted perturbation, finally, to stable cellular interface. It has been found that the wave-length of stable cellular interface is different from that of initial perturbation and always integral times larger than that of initial one. There is also a difference to be found between critical velocity of the plane-to-cell transition and that of cell-to-plane transition for a same crystal grown from the same system. It may be implied that the facetted cell is more stable than the nonfacetted plane.
RELAXATION PROCESSES OF CARRIERS IN AMORPHOUS SEMICONDUCTOR SUPERLATTICES WITH MODULATEDLY DISTRIBUTED RECOMBINATION CENTERS
Authors: XIONG SHI-JIE  ,   南京大学物理系固体物理研究所
Published: December 2020

We propose a continuous-time-random-walk model for a medium with moduiatedly distributed recombination centers to describe dynamical recombination processes of carriers in amorphous semiconductor superlattices. The survival probabilities of carriers are obtained in cases of different types of time distribution functions. Analysis of the results yields informations on the influences of the periodic potential wells and of the modulated doping on the macroscopic transport properties in this kind of artificial materials.
SEGREGATION KINETIC INVESTIGATION OF SULFUR ON THE Ni(100) SURFACE
Authors: FAN YONG-NIAN  ,   中国科学院金属研究所
Published: December 2020

The segregation kinetics of sulfur on the Ni (100) surface has been investigated by means of AES during heat treatment of the sample between 650℃ and 800℃. The concentration of segregated sulfur is proportional to the square root of time in agreement with McLean's model. The temperature dependence of the diffusion coefficient D is D(cm2/s) = 5×10-3 exp(-44600/RT). The LEED experiment shows that the saturated sulfur layer has a c(2×2)-S structure at room temperature. Depth profile analysis shows an exponential decrease of (S/Ni) Auger peak height ratio with time during argon ion bombardment.
SURFACE PLASMONS IN QUASIPERIODIC SEMICONDUCTOR SUPERLATTICE
Authors: QIN GUO-YI  , WANG YONG-SHENG  ,   南京大学物理系
Published: December 2020

Based on a model a little bit complicated than that in ref. [2] , the mathematical method of ref. [1] was used to yield an universal condition of dispersion. By means of this condition, the surface plasmon spectra of the quasiperiodic semiconductor superlattice of type-I, type-II and II-VI compounds were discussed.The results show that bacause of the break of reflection symmetry in the plane perpendicular to the axis of the superlattice, when the surface is located at the Fm different interfaces of the primary cell, the spectrum of surface plasmon shows a great deal of patterns for each choice of sets of the parameters. (Fm is the Fibonacci number).
THE AGGREGATION EFFECT OF METAL IONS ON SILVER SOL AND THE FRACTAL STRUCTURE FORMED
Authors: YU FENG-QI  , ZHANG CHUN-PING  , ZHANG GUANG-YIN  ,   南开大学物理系
Published: December 2020

We have studied the aggregation of silver sol by mixing silver sol with several kinds of ions. We found that it is very difficult for the monovalent metal ions to make silver sol aggregate. The metal ions of the second main group can make silver sol aggregate and form fractal state. With the radii of metal ions increase, their ability of aggregation increases accordingly. The metal ion of the third main group A13+ can also make silver sol aggregate and form fractal state. As for acid radical ions, they can not make silver sol aggregate directly, but they can influence the speed of the aggregation and final state of silver sol. The simple explanations of these phenomena were given. We also found that the speed of aggregation and final state of silver sol were determinded by the state of silver sol and the proportion of metal ions in silver sol.
COMPUTER SIMULATION STUDY ON PRESSURE EFFECT IN AMORPHOUS IRON
Authors: HONG JING-XIN  , SHEN ZHONG-YI  , YIN XIU-JUN  , ZHANG YUN  , HE SHOU-AN  ,   (1)中国科学院物理研究所; (2)中国科学院物理研究所,现在齐鲁石化公司设计院计算站,山东省淄博市
Published: December 2020

By computer simulation, the pressure induced variation in the behavior of amorphous metals is investigated. We used the Lennard-Jones potential, which is fitted with the equation of state of iron, to relax the amorphous model constructed by sequentially stacking the hard sphere together with energy minimization consideration, so as to yield an amorphous iron model containing 1067 atoms with periodic boundary. The variation of RDF of this amorphous iron model under the application of high pressure is also examined. From the obscuring tendency of two splitted sub-peaks in the second maximum of the RDF of the pressurized model, we suggest that the local ordered correlation in the amorphous alloys might be destroyed during compression. The P-V relation of amorphous iron has also been estimated by comparing with the crystalline state.
ELECTRONIC STRUCTURE OF THE DIVACANCY IN CUBIC SEMICONDUCTORS (Ⅳ)——WAVEFUNCTIONS OF THE DIVACANCY STATES IN GaAs AND GaP
Authors: HU WEI-MIN  , MAO DE-QIANG  , REN SHANG-YUAN  , LI MING-FU  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学研究生院
Published: December 2020

The wavefunctions of the A1 and E states of the ideal divacancy in GaAs, GaP are calculated using the basic equations given in ref. [1] and the tight-binding Hamiltonian given by P. Vogl et al. It is shown that the largest part of the wavefunctions of divacancy states is on the three nearest Ga atoms of the As or P vacancy, the rest part of the wavefunction decreases slowly and non-monotonically as the distance from the defect increases.
EXAFS STUDY OF NEAR-NEIGHBOR STRUCTURE ABOUT Mn ATOM IN QUASICRYSTALLINE Al-Mn ALLOY
Authors: CHANG LONG-GUN  , LU KUN-QUAN  , LI CHEN-XI  , JIN LONG-HUAN  ,   中国科学院物理研究所
Published: December 2020

EXAFS spectra (including near edge X-ray absorption spectra) have been measured at the Mn K edge of i-Al6Mn, i-Al4Mn and crystalline Al6Mn. The first near-neighbor structures about Mn atom of the i-Al6Mn and i-Al4Mn have been studied and discussed. We found that the average distance between Al and Mn atoms is about 2.52 angstrom in quasicrystalline phases and its shorter than that in crystalline Al6Mn. The coordination number around Mn atom is about 5 in quasicrystalline phases and is less than that in crystalline Al6Mn. The structure unit may be the same as in i-Al6Mn and i-Al4Mn. It is reasonable that the Mn atoms distribute on the surface of the unit.
A STUDY OF OXIDATION PROCESS ON Fe-SURFACE
Authors: CHEN YUN-QI  , LIN ZHANG-DA  , WU SHU-YAO  , QI SHANG-XUE  , WU XIAO-LIN  ,   中国科学院物理研究所
Published: December 2020

The early oxidation process of pure Fe was studied by XPS, UPS and AES. When the temperature and partial pressure of oxygen is not too high, the product of the reaction between polycrystalline Fe and oxygen is pure Fe3O4, but not FeO or a-Fe2O3 or a structure of layers of the three compounds. If the temperature is higher than 600℃ and the partial pressure of oxygen approach 1 × 10-6 Torr, the thermo-desorption process occurs instead of oxidation process on polystalline Fe surface.