bluuebunny/crossref_metadata_2025 huggingface dataset:
STUDY ON GROWTH OF C60 MOLECULES ON GaAs(001) SUBSTRATE BY SCANNING TUNNELING MICROSCOPY
Authors: LING YONG  , XUE QI-KUN  , CHEN HAO-MING  , T.SAKURAI  ,   (1)清华大学现代应用物理系; (2)清华大学现代应用物理系;日本东北大学金属材料研究所; (3)日本东北大学金属材料研究所
Published: November 2020

We have studied the growth of C60 film on GaAs(001) 2×4-β phase surface epitaxially grown by MBE.Due to the delicate equilibrium between the interaction of C60 molecules and the interaction of C60 molecule with the substrate,the toplayer of C60 film,unlike that on the metal and silicon substrate,shows a non-close packed structure.The facet structure of C60 film exhibits that the top-two layers are hcp but the others are fcc,which implies an existence of the phase-transition from hcp to fcc structure in the film growth.The measurement results that the lattice constant of fcc is 1.13 nm,larger of 13% than that of C60 crystal,and hcp is not ideal which is compressed along c-axis.The strain in C60 film and the minimum of the total energy should be responsible for the existence of the phase-transition.On GaAs(001)-c(4×4) surface,the structure of C60 film shows fcc(111) surface and the film grows in three-dimensional mode which is quite different from that on other substrates.
AN INVESTIGATION FOR THE ZERO FIELD SPLITTING PARAMETERS OF Fe3+ IONS AT THE DEFECT SITES IN THE FLUOROPEROVSKITES AM F3:Fe3+
Authors: JIANG DE-QIONG  , LI MIN-HUI  , YU WAN LUN  ,   四川师范大学物理系
Published: November 2020

The zero field splitting (ZFS) of Fe3+ ions at the tetragonal symmetry sites in the fluoroperovskites AMF3 doped with Fe3+ is analysed and shown the existence of the crystal defects and lattice distortion.The ZFS parameters are investigated as a function of the defect induced lattice distortion parameters.The distortion parameters are obtained by adjusting them to fit the experimental ZFS data.
HIGHER POWER SQUEEZING AND ANTIBUNCHING EFFECTS FOR GENERALIZED ODD AND EVEN COHERENT STATES OF A NON HARMONIC OSCILLATOR
Authors: YU ZHAO-XIAN  , WANG JI-SUO  , LIU YE-HOU  ,   (1)聊城师范学院物理系; (2)胜利油田职工大学; (3)重庆石油高等专科学校
Published: November 2020

Theoretical calculations show that the generalized odd and even coherent states(OECS) of a non harmonic oscillator represent higher power (odd number power) squeezing effect and antibunching effect respectively, and these photon statistical characteristics are very different from those of the ordinary OECS.
Y-G ALGORITHM USED IN WDM
Authors: WU XIAO-PING  , FAN CHAO-YANG  , ZHOU WEN  ,   (1)清华大学电子工程系; (2)浙江大学物理系; (3)浙江大学信息与电子工程学系
Published: November 2020

Y-G algorithm is used in the whole desigh of a new type phase-only-controlled wave length division multiplexer (WDM). According to the intensity distribution set up on the input (H1) and output(H2) faces, the phase distribution on H1 and H2 can be designed. By only phase modulation, The demultiplex and focusing etc. are realized, thus the WDM structure is simplified, and at the same time the Y-G algorithm is extende to the situation that the input beam is a 2-D Gaussian beam and the output beam is also a 2-D Gaussian beam.
VISCOUS FLOW BEHAVIOUR OF Zn-Al EUTECTOID ALLOY
Authors: SHUI JIA-PENG  , CHEN XIU-MEI  ,   中国科学院固体物理研究所内耗与固体缺陷开放研究实验室
Published: November 2020

Strain rate and shear viscosity are measured for Zn-Al eutectoid alloy under continuous heating rate conditions.The minimum values of the shear viscosity accompanied by the eutectoid change process have been observed.The stress dependence of the strain rate and the heating rate dependence of minimum values of the shear viscosity have been investigated.It is found that the relation between strain rate and the stress in the temperature region of the phase transformation obeys Newtonian viscous flow law.The viscous flow behaviour of Zn-Al eutectoid alloy in the temperature region of phase transformation can be explained with the number and the property of the phase interface.Comparing the activation energy of the phase transformation with that of viscous flow of the phase interface,it is found that the fluidity of phase interface is likely to be a primary factor which influences phase transformation process.In a previous work,the minimum values of viscosity have been observed in glass transition and crystallization process of amorphous Pd-Cu-Si alloy.According to these results,it is shown that the minimum viscosity emerged in structural transition process has some universality.
SURFACTANT EFFECT ON THE STRUCTURE OF THIN Ge HETEROEPILAYERS STUDIED BY X-RAY DIFFRACTION
Authors: ZHU HAI-JUN  , JIANG ZUI-MIN  , ZHENG WEN-LI  , JIANG XIAO-MING  , XU A-MEI  , MAO MING-CHUN  , HUDONG ZHI  , ZHANG XIANG-JIU  , WANG XUN  ,   (1)复旦大学应用表面物理国家重点实验室; (2)中国科学院高能物理研究所
Published: November 2020

The effect of Sb on Ge epilayer grown on Si(001) is investigated in situ by RHEED and ex situ by X-ray diffraction.Without Sb,island formation takes place when Ge epilayer is 6nm thick,and the strain in Ge epilyer is totally relaxed.With Sb,the growth mode of Ge on Si is two- dimensional, and the strain is relaxed gradually.Even if the thickness of the Ge epilayer is 6nm, 42%- strain is still not relaxed.
A STUDY OF ABNORMAL ELECTRIC PROPERTIES OF LEAD LANTHANUM TITANATE THIN FILMS CAUSED BY EXCESS PbO
Authors: SONG ZHI-TANG  , REN WEI  , ZHANG LIANG-YING  , YAO XI  ,   西安交通大学电子材料与器件研究所
Published: November 2020

Lead lanthanum titanate(PLT) thin films with excess PbO were prepared by metal organic decomposition (MOD) process.The C-V characteristics and ferroelectric properties of the PLT films were investigated as functions of amount of excess PbO.The normal P-E hysteresis loops and butterfly shape C-V curves were obtained for the PLT films with stoichiometric composition.While abnormal ferroelectric and C-V properties were observed in the PLT films with excess PbO.The P-E hysteresis loops were pinched before the polarization of the films reached the saturation.Instead of two peaks (butterfly-shape) in the normal C-V curves,the C-V curves had four peaks. The abnormal behavior of the hysteresis loops and C-V curves became more serious with increasing amount of excess PbO in the films.The results can be explained by the ferroelectric pinning effect.A part of excess PbO may be accumulated at boundaries of crystalline grains and clusters and the interface between the bottom electrode and the film during the annealing process of the films.PbO may act as the pinning centers and has a strong effect on the ferroelectric domains.If the biased voltage is not large enough,then part of the electric domains cannot overcome the force of the pinning,and abnormal ferroelectric and C-V properties will be observed.Excess PbO may be one of the main causes of fatigue and aging of ferroelectric thin films.
THE NUMERICAL SOLUTION AND ITS APPLICATION IN STRONG FIELD HIGH ORDER HARMONIC GENERATION OF ONE DIMENSIONAL TIME DEPENDENT SCHRDINGER EQUATION
Authors: LI XUE-XIN  , XU ZHI-ZHAN  , TANG YAN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

By solving the 1-dimensional time-dependent schrdinger equation,the ionization probability and harmonic spectra of atom under different laser intensities are obtained,and the relation between the ionization and harmonic emmission is discussed.The result is that under certain range of laser intensity during which the ionization is stable or supperessed,the harmonics will be emitted efficiently.
FOUR KINDS OF RAISING AND LOWERING-OPERATORS OF A TWO-DIMENSIONAL-ISOTROPIC HARMONIC OSCILLATOR
Authors: LIU YU-FENG  , ZENG JIN-YAN  ,   北京大学物理系
Published: November 2020

Using the factorization method,four kinds of raising and lowering operators of a two dimensional isotropic harmonic oscillator were derived, and the corresponding selection rules and conserved quantum numbers were discussed.
DELAY IDENTIFICATION IN CHAOTIC TIME SERIES
Authors: TIAN YU-CHU  ,   浙江大学工业控制技术研究所工业控制技术国家重点实验室
Published: November 2020

By using the embedding techniques for reconstructing chaotic attractors,this paper proposes a macroscopic information entropy approach for identifying the delay in a chaotic time series sampled from a continuous-time system.The effectiveness of the proposed approach is illustrated through numerical experiments.
SCANNING TUNNELING MICROSCOPY INVESTIGATION OF GOLD ISLANDS FORMED ON HOPG SURFACE BY VACUUM DEPOSITION
Authors: YU HONG-BIN  , YANG WEI-SHENG  ,   (1)北京大学物理系; (2)人工微结构和介观物理国家重点实验室
Published: November 2020

Formation and shape of the gold islands formed by vacuum deposition on the highly oriented pyrolytic graphite (HOPG) surface has been studied by means of scanning tunneling microscopy (STM). In the early stage of formation, gold atoms tend to aggregate into large clusters, which may be disturbed easily by the STM tip in the course of imaging. With the increasing coverage, the gold clusters can move and coalesce into large oblong islands, and the islands can further aggregate into clusters with variable shapes. When the coverage reaches about 20 monolayers, the islands or island clusters can be imaged without being disturbed by the tip, provided that the tunneling resistance is high enough. It has been noticed that the islands have a very similar ratio of width to height. The value of this ratio indicates that the islands essentially have a thermodynamically equilibrium shape. Such islands formed by self assembly may have potential in investigations of mesoscopic physics as well as applications.
STRUCTURE AND CHARACTERISTICS OF C3N4 THIN FILMS
Authors: WU DA-WEI  , HE MENG-BING  , GUO HUAI-XI  , LUO HAI-LIN  , ZHANG ZHI-HONG  , FU DE-JUN  , FAN XIANG-JUN  ,   武汉大学物理系
Published: November 2020

Nitride carbon thin films have been deposited by plasma-enhanced chemical vapor phase deposition. The results of transmission-electron diffraction indicated that films have polycrystal structures. Carbon and nitrogen atoms binding energies and the nitrogen content of the-films are measured out by X-ray photoelectron spectroscopy.The Fourier transform infrared spectrum show that there is no graphite phase in the films,and the Vickers hardness of the films vary from 29.2 to 50.0GPa.
NUMERICAL ANALYSIS OF THE NONLINEAR ANELASTIC INTERNAL FRICTION PEAK (P′1 PEAK) UNDERLOW STRESS AMPLITUDE
Authors: FANG QIAN-FENG  ,   中国科学院固体物理研究所内耗与固体缺陷开放研究实验室
Published: November 2020

The longitudinal diffusion equation of the solute atom along dislocation core for P′1 peak is numerically solved and the P′1 peak is derived on the base of dislocation kink atmosphere model. The variation of internal friction and modulus defects with temperature and strain amplitude is calculated. The theoretical and experimental results are compared and found to be in consistence with each other. Therefore, the P′1 peak can be quantitatively explained.
THREE-ELECTRON SYSTEMS OF THREE-DIMENSIONAL QUANTUM DOTS
Authors: XIE WEN-FANG  ,   广东工业大学数理系
Published: November 2020

The structures of three-electron systems of three-dimensional quantum dots are investigated via an analysis of quantum mechanical symmetry and the possibility of magic numbers exitence is pointed out. We compared it with the magic numbers of three-electron systems of two-dimensional quantum dots. Within the effective-mass approximation, the energy spectra of three-electron systems in a parabolic potential (?ω0=2meV) are calculated. The results show that there is the trace of the magic numbers exitence. The ground state of three-electron systems of three-dimensional quantum dots is 1- state.
ATOMIC COHERENCE INDUCED BY TWO-PHOTON PROCESS——TRANSITION FROM LASING WITH INVERSION TO LASING WITHOUT INVERSION
Authors: HU XIANG-MING  , WANG DE-XIN  ,   (1)华中师范大学物理系; (2)华中师范大学应用物理研究所
Published: November 2020

In this paper, the pumping mechanism in the closed Ξ-type three-level system can be simplified using the coherence induced by the two-photon process. The system exhibits either lasing with inversion or lasing without inversion so long as there exists the pumping field. The system exhibits the transition from lasing with inverson to lasing without inversion under certain conditions. Near the transition lasing without inversion may be as efficient as lasing with inversion.
CALIBRASION OF THE ENERGY RESPONSE FOR THE SOFT X-RAY DETECTIONS ELEMENTS WITH THE BEIJING- SYNCHROTRON RADIATION FACILITY
Authors: SUN KE-XU  , YI RONG-QING  , YANG JIA-MIN  , WANG HONG-BIN  , MA HONG-LIANG  , CHEN ZHENG-LIN  , HUANG TIAN-XUAN  , CUI YAN-LI  , ZHENG ZHI-JIAN  , TANG DAO-YUAN  , DING YONG-KUN  , WEN SHU-HUAI  , JIANG WEN-MIAN  , ZHAO YONG-KUAN  , CUI MING-QI  , LI GANG  , CUI CONG-WU  , TANG E-SHENG  ,   (1)中国工程物理研究院高温高密度等离子体物理实验室; (2)中国科学院高能物理研究所
Published: November 2020

Calibration of the energy response for the soft X-ray detection elements using in the ICF diagnostic are reported.The Beijing synchrotron Radiation Facility (3B1 beam line,photon energy～250—1000eV,radiation flux ～1012photon/s·mm2·mr2·0.1% band-width,beam current ～20—80mA) and target chamber of the reflectometer are used.The source intensity is monitored by AXUV-100 photodiode.The calibration of the energy response for the XRD,filter light film,Ⅱa type diamond photoconductive detector,transmission grating and soft X-ray film are given and analysed.
THE EFFECT OF ATOMIC DISORDER FLUCTUATION ON C60
Authors: FU ROU-LI  , YE HONG-JUAN  , FU RONG-TANG  , RAO XUE-SONG  , SUN XIN  ,   (1)复旦大学物理系; (2)中国科学院上海技术物理研究所红外物理国家重点实验室
Published: November 2020

The effect of atomic disorder fluctuation on the distributions of bond lengths and electron densities for optically-excited C60 and C60 doped with alkali-metal are studied and we adopt the methods that the fluctuation is modeled by Gaussian-random parameters, and that the sample averaging is performed over a large number of independent atomic disorder configurations.The distributions of bond lengths and electron densities are shown to be the functions of the strength for the atomic dis order fluctuation,as well as the number and variety of extra charges.It is discovered:1 When the difference between the long and short bonds is 0.0044nm,the dimerization in C60 still remains when the atomic disorder fluctuation is 0—0.01nm.2 When the strength of the atomic disorder fluctuation is 0—0.00775nm,there exist polarons in C±60 and C--60; when the strength of the atomic disorder fluctuation is 0—0.00548nm,there also exist polarons in C－60,C3－60 and C±±60.
NONLINEAR THEORETICAL ANALYSIS OF THE TRANSPORT PROPERTIES OF 2-D BLOCH ELECTRON UNDER ELECTRIC AND MAGNETIC FIELD
Authors: TIAN QIANG  , MA BEN-KUN  , ZHU YI-NAN  ,   北京师范大学物理系
Published: November 2020

Magnetic-field-induced electronic Bloch-energy-band splitting is unimportant at not very low temperature. In such cases, we analyse the Hall drifted velocities with the quasiclassical dynamic equations. The numerical solutions demonstrate a striking sudden change of each Hall drifted velocity.
DYNAMIC SCALING OF HYSTERESIS IN THE 2D ISING MODEL WITH IMPURITIES
Authors: ZHONG FAN  , ZHANG JIN-XIU  ,   中山大学物理系
Published: November 2020

As impurities always plague real experiments,we report here a study on the effect of impurity on the dynamic scaling behavior of hysteresis.The model used is the two -dimensional Ising model with quenched random non-magnetic impurities.The results show that for any temperature below the critical point,there exists a corresponding critical concentration of impurities that serves as the critical point in the pure model for distinguishing the scaling behavior of hysteresis.The hysteresis loop area A,representing the dissipation per cycle,scales with the scanning rate of the external field R as A=A0+aRn, with a nearly constant n～1/3, weakly dependent on the concentration,and a finite area A0 even for vanishing small rates below the critical concentration.While above it, A0=0 and n increases significantly with the concentration. This behavior is similar to the pure system.Thus in the concentration -temperature phase diagram there is a regime within which the scaling relation and its exponent of the pure system are robust with impurities.
THE LAX PAIR AND ITS BOUNDARY K MATRIX-FOR XYZ SPIN OPEN CHAIN
Authors: GUAN XI-WEN  , TONG DIAN-MIN  , ZHOU HUAN-QIANG  ,   (1)吉林大学物理系; (2)山东师范大学物理系; (3)重庆大学物理系
Published: November 2020

The Lax pair for the XYZ model under the open boundary condition is explicitly constructed and the general boundary K matrices are obtained.
GRAVITATIONAL EFFECT IN THE OUTSIDE OF THE CHARGED ROTATING SPHERE
Authors: LUO XIN-LIAN  , WANG YONG-JIU  , CHENG LI-WEI  ,   湖南师范大学物理系物理研究所
Published: November 2020

The geodesic equations of a test particle are used as the starting point for calculating the effect of perihelion advance, caused by rotating charge. Compared with that of Kerr field, the correction terms enhance the advance effect as the revolutionary direction of particle coincides with that of field source. Moreover, by introducing local Lorentz spacial section, the acceleration of a moving body in this field can be given. It is easy to show that particles cannot arrive at field source from the axis direction or from equatorial plane, but can be held up at r＝k＋(k2＋4m2ａ2)1/2/2m or r=k/m in comoving coordinates (vi=0). In a way, the accretive effect of galatic dust, i.e. the distribution of dust can be calculated then. Finally, the Coriolis-like acceleration of the moving body circling around the source on equatorial plane (only v3≠0) is also discussed.
THE PREPARATION AND MICROSTRUCTURE STUDY OF NANO METAL-SEMICONDUCTOR FILM Cu∶CdS
Authors: ZHAO ZI-QIANG  , WEI LUN-CUN  , WANG HAO  , ZHANG JIN-HONG  , ZHONG YUN-CHENG  , LU XI-TING  ,   北京大学技术物理系重离子物理研究所
Published: November 2020

By using magnetic controlled sputtering of-atoms and evaporating insulator medium, Cu clusters embedded in CdS, a metal-semiconductor film Cu∶CdS has been successfully prepared. TEM is used in studying the microstructure of Cu clusters embedded in the medium CdS. The copper cluster is well embedded in CdS. The size of the triangle-shaped grains, Cu clusters, is from 5nm to 20nm. The Cu cluster and medium CdS are both of polycrystalline structures. And the Cu cluster′s lattice constant expands by about 7%.
SPECTROSCOPIC MEASUREMENT OF PLASMA POLOIDAL ROTATION ON THE CT-6B TOKAMAK
Authors: ZHAO QING-XUN  , LI ZAN-LIANG  , ZHENG SHAO-BAI  ,   (1)河北大学物理系; (2)中国科学院物理研究所
Published: November 2020

By means of a high-resolution spectroscopic detection system, the radial profiles of plasma poloidal rotation velocity have been measured from the Doppler shifts of impurity ion lines OⅡ464.2nm, CⅢ464.7nm and the hydrogen Hα line on the CT-6B Tokamak. The results show that inside the plasma, the poloidal rotation velocity of impurity ions is in the electron diamagnetic drift direction and reaches its maximum value of～3.5km/s at the minor radius around 9cm. It reverses to the ion diamagnetic drift direction with its maximum value at r=10cm near the limiter. The internal electric field deduced from these data is directed towards the plasma center, and its maximum value is 18V/cm. There is also a poloidal rotation velocity component for neutral hydrogen but it is only in the electron diamagnetic drift direction with a value notably less than that of the ions. A preliminary discussion of the results is also given.
STUDY OF GIANT MAGNETORESISTANCE IN THE In-SUBSTITUTED (La2/3Ca1/3)(Mn(3-2x)/3In2x/3)O3 SYSTEM
Authors: XU MING-XIANG  , JIAO ZHENG-KUAN  ,   浙江大学物理系，杭州  310027
Published: November 2020

The In-substituted system,(La2/3Ca1/3)(Mn(3-2x)/3In2x/3)O3(x=0.00，0.10，0.15),was synthesized by solid-state reaction method.Its temperature dependence of electrical resistance and magnetoresistance (H=0,1.6T) and field dependence of magnetoresistance were measured by the four-probe method.It was found that when x increases,both the peak of the electrical resistivity and the peak of magnetoresistance move to lower temperatures.However,the cusp is broadened by In-substitution.The authors suggested that the variation of the proportion of In3+ ions leads to the change of manganese valence and the magnetic moments,as well as magnetic structure of the (La2/3Ca1/3)(Mn(3-2x)/3In2x/3)O3 system.Such phenomena weaken the ferromagnetic double exchange effect.
RAMAN SPECTRA AND VISIBLE PHOTOLUMINESCENCE OF THE METAMICT FERGUSONITE GROUP MINERALS IN BAIYUNOBO
Authors: XUE LI-HUI  , GONG WEI-LIANG  ,   (1)武汉工业大学材料研究与测试中心，武汉  430070; (2)中国科学院贵阳地球化学研究所，贵阳  550002
Published: November 2020

Raman spectra of the metamict and annealing recrystallization fergusonite and brocenite, found in Baiyunobo mineral deposit in China, have been measured and discussed. The spectra give three well defined characteristic band regions. The bands in the regions 840 to 600cm-1 and 340 to 280cm-1 are assigned to NbO3-4 tetrahedron stretching and bending vibrations, respectively. While the frequencies observed below 200cm-1 are due to the external modes of the NbO3-4 and lanthanide ions. The dependence of Raman frequencies on the structure and composition of the metamict and annealing recrystallization fergusonite group minerals shows that the Raman spectra are valuable for reflecting the structure distortion of the minerals. Additionally, the strong visible photoluminescence from annealing recrystallization is observed when 514.5 or 488.0nm laser line is used as excitation source, whereas metamic fergusonite group minerals exhibit no visible photoluminescence, or weak one.
ANNEALING BEHAVIORS OF PHOTOLUMINESCENCE FROM SiOx∶H FILMS
Authors: MA ZHI-XUN  , LIAO XIAN-BO  , HE JIE  , CHENG WEN-CHAO  , YUE GUO-ZHEN  , WANG YONG-QIAN  , DIAO HONG-WEI  , KONG GUANG-LIN  ,   (1)中国科学院半导体研究所，超晶格与微结构国家重点实验室，北京  100083; (2)中国科学院半导体研究所，凝聚态物理中心，表面物理国家重点实验室，北京  100083
Published: November 2020

The nanocrystalline silicon embedded in silicon dioxide has been successfully prepared by post heat treatment for SiOx∶H.We have found that each strong photoluminescence spectrum from a-SiOx∶H consists of two Gaussian components.One is a main broad peak which redshifts with the increase of annealing temperature and the other is a shoulder remaining at about 835 nm.In conjunction with infrared and micro-Raman spectra,the possible origins of the two bands are discussed.The peaks around 850 nm after annealing at 1170℃ are associated with the precipitation of nanocrystalline silicon,and this supports the quantum confinement effect.
CRYSTAL-FIELD SPLITTING OF Er3+ IN SILICON
Authors: LEI HONG-BING  , YANG QIN-QING  , WANG QI-MING  ,   中国科学院半导体研究所集成光电子国家重点实验室，北京  100083
Published: November 2020

Rare earth element of erbium implanted into silicon was studied by photoluminescence,and nine spectral lines were observed.The analysis of the symmetry of crystal field shows that the nine spectral lines come from the crystal-field splitting of the transition 4I13/2→4I15/2.We concludethat the symmetry of the two low-energy excited (initial) state levels,in order of increasing energy,are Γ8 and Γ6, from which to the splitting state levels of 4I15/2 nine radiative transitions are allowed.Oxygen codopants can increase greatly the PL intensity of Er3+, but the spectral features are similar,indicating oxygen codopants can enhance the intensity of Td crystal field rather than change the Td symmetry of the crystal field on the Er3+ sites.
THEORY OF GUIDED-WAVE MAGNETOOPTIC BRAGG DIFFRACTION IN YIG-GGG WAVEGUIDE UNDER INCLINED BIAS MAGNETIC FIELD
Authors: LIU GONG-QIANG  , C.S.TSAI  ,   (1)Department of Electrical and Computer Engineering,Institute for Surface and Interface Science,University of California,Irvine,92697 USA; (2)上海交通大学应用物理系，上海  200030
Published: November 2020

A theoretical Treatment is presented on the propagation characteristics of magnetostatic forward volume waves and related guided-wave magnetooptic (MO) Bragg diffraction in an YIG-GGG waveguide under an inclined bias magnetic field.It is found that,in contrast to the usual situation of a perpendicular bias magnetic field,an inclined bias magnetic field leads to the modification to the phase matching condition and,as a result of increased Faraday effect etc.,facilitates enhancement of MO Bragg diffraction efficiency.Such an efficiency enhancement enables utilization of low-propagation loss materials such as the pure YIG for construction of viable guided-wave MO Bragg devices.The theoretical predictions are in good agreement with the experimental results.
EXCITATION ENERGY TRANSFER BY COLLISIONS BETWEEN EXCITED RUBIDIUM ATOMS
Authors: WANG JIN  , HU ZHENG-FA  , ZHANG DENG-YU  , ZHAN MING-SHENG  ,   (1)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉  430071; (2)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉  430071;中国科学院安徽光学精密机械研究所激光光谱学开放实验室，合肥  230031
Published: November 2020

This paper reports the experimental observation of the excitation energy transfer to higher states by collisions between two rubidium atoms excited to a specific state by a CW single mode laser. An obvious competition has been observed between the channel of transition to the ground state by spontaneous emission, and that to higher excited states by collisions of two excited atoms. Formation rates of the high excited states with different laser power, atomic vapor temperature and laser detuning have been measured. A proposed mechanism well explained the experimental result.
HINDERED ROTATION OF CHIRAL ALKYL CHAIN IN ANTIFERROELECTRIC LIQUID CRYSTAL TFMHxPOCBC-D2 AS OBSERVED BY POLARIZED IR SPECTROSCOPY OF CD2 STRETCHING VIBRATION
Authors: LING ZHI-HUA  ,   中国科学院长春物理研究所，长春  130021
Published: November 2020

Using a homogeneously aligned cell as a holder for liquid crystols, we have investigated the polarization dependence of FT-IR of the stretching of CD2 in chiral alkyl chain of TFMHxPOBC-D2(4-(trifluoromethylhexy-3-d2 carbonyl)phenyl 4'-octyloxybiphenyl caboxylate) and observed the hindered rotation of the chiral alkyl chain for the first time to our knowledge. Simulation on the IR polarized absorbance leads to an angle of 70° between the chiral alkyl chain and the molecular axis.The biased direction and the tilt direction of molecules are toward the same side.
STUDY OF VACANCY MIGRATION IN NiAl BY MOLECULAR DYNAMICS
Authors: WANG YUE-XIA  , WANG BAO-YI  , RONG ZHOU-WEN  , WANG TIAN-MIN  ,   (1)北京航空航天大学理学院，北京  100083; (2)兰州大学材料科学系，兰州  730000; (3)中国科学院高能物理研究所，北京  100039
Published: November 2020

The molecular dynamics method is employed to simulate motions of monovacancies in the ordered intermetallic compound NiAl using Finnis-Sinclair N-body potentials.It is shown that the antistructure bridge mechanism is important at compositions deviated from stoichiometry, and near the stoichiometry, the six-jump cycle, the staight ［100］-type for Al vacancy and ［110］-type cycle for Ni vacancy, are energetically favorable. The calculated results, which are consistent with experimental measurement, clarify the recovery behavior of defects in NiAl quenching experiment.
A GRAIN-BOUNDARY CONDUCTION MODEL FOR STABILIZED-ZIRCONIA
Authors: GUOXIN  ,   华中理工大学材料科学与工程系，武汉  430074;武汉工业大学材料复合新技术国家重点实验室，武汉  430070
Published: November 2020

In stabilized-ZrO2 with high-purity, the space-charge contribution plays a dominating role in the grain-boundary resistance. A grain-boundary conduction model is proposed on the basis of this concept, and the effect of the segregations of calcium, yttrium and aluminium on the space-charge conduction is discussed, the segregations are all found to decrease the space-charge conduction, thus increase the grain-boundary resistance. Some formerly-established concepts are evaluated via the model, the limitation of the complex impedance approach based on the Bauerle′s equivalent circuit is pointed out, and the defect of the concept of the resistance per unit interface area of the grain boundaries is also discussed.
STUDIES ON TEMPERATURE DEPENDENCE OF PHOTOLUMINESCENCE IN POROUS SILICON
Authors: LIU XIAO-BING  , XIONG ZU-HONG  , YUAN SHUAI  , CHEN YAN-DONG  , HE JUN  , LIAO LIANG-SHENG  , DING XUN-MIN  , HOU XIAO-YUAN  ,   (1)复旦大学应用表面物理国家重点实验室，上海  200433; (2)复旦大学应用表面物理国家重点实验室，上海  200433;长沙电力学院物理系，长沙  410077
Published: November 2020

The temperature dependence of photoluminescence (PL) in porous silicon has been investigated. It is found that the PL peak from the low porosity samples shows a red shift with decreasing temperature, but the blue shift of the PL peak is always observed in the high porosity samples. The temperature dependence of the PL peak shift observed experimentally can be qualitatively explained by the simulated curves of the luminescent efficiency versus wavelength.
STUDY ON THE FLUORESCENT COOLING BY ENERGY TRANSFER WITHIN INHOMOGENOUS LINE SHAPE IN SOLIDS
Authors: QIN WEI-PING  , ZHANG JIA-HUA  , HUANG SHI-HUA  ,   中国科学院长春物理研究所激发态物理开放研究实验室，长春  130021
Published: November 2020

In this paper, a new mechanism of anti-Stokes fluorescent cooling based on the energy transfer among the centers within the inhomogeneously broadened line is proposed. The dependence of relative cooling efficiency on excitation photon energy and temperature is discussed.
POINT DEFECT STUDIES ON PEROVSKITE STRUCTURED PIEZOELECTRIC CERAMICS USING POSITRON ANNIHILATION
Authors: HE YUAN-JIN  , MA XING-KUN  , GUI ZHI-LUN  , LI LONG-TU  ,   (1)清华大学材料科学与工程系，北京  100084; (2)清华大学现代应用物理系，北京  100084
Published: November 2020

A systematic investigation of different types of lattice defects in intentionally doped or impurity substituted piezoelectric ceramics was carried out by using positron annihilation.La3+ doped PbTiO3,Sr2+,Cd2+,and La3+ doped Pb (Mg1/3Nb2/3)0.375Ti0.375Zr0.25O3;Ca2+ doped BaTiO3; and Nb5+ doped SrTiO3 were chosen as testing materials.It was found that positrons can be traped by cation vacancies,oxygen vacancies,as well as defects associated with lattice deformations,but with different dynamic specific trapping rates and annihilation characteristics.A new possible method for determining the defect species in perovskite structured piezoelectric ceramics is presented.
MICROSTRUCTURES OF THE MICRO-CRYSTALLINE SILICON THIN FILMS PREPARED BY HOT WIRE CHEMICAL DEPOSITION WITH HYDROGEN DILUTION
Authors: GUO XIAO-XU  , ZHU MEI-FANG  , LIU JIN-LONG  , HAN YI-QIN  , XU HUAI-ZHE  , DONG BAO-ZHONG  , SHEN WEN-JUN  , HAN HE-XIANG  ,   (1)中国科学技术大学研究生院物理系，北京  100039；中国科学院半导体材料科学实验室，北京  100083; (2)中国科学院半导体研究所半导体超晶格国家重点实验室，北京  100084; (3)中国科学院高能物理研究所，北京  100039
Published: November 2020

Microcrystalline silicon thin films were prepared by hot wire chemical vapor deposition with hydrogen dilution. Structures of the films were examined by Raman scattering, Fourier transform infrared (IR) and small angle X-ray scattering (SAXS)etc. It is shown that with increasing flow ratio RH=H2/(H2+SiH4) the volume fraction of crystalline increases while the hydrogen content decreases. The result from SAXS indicates that with increasing dilution ratio, the density of the film is increased, which implies the volume fraction of micro-voids is reduced. Combining with the data from IR and SAXS, we conclude that SiH2 vibration mode in hydrogenated microcrystalline silicon thin film is located at the grain boundaries rather than in the internal surface of the micro-voids.
DIELECTRIC INFORMATION IN THE STRUCTURAL TRANSITION OF POLYMERS
Authors: LI JING-DE  , CAO WAN-QIANG  , LIU JUN-DIAO  , XIAO ZHONG-MO  ,   中山大学物理系，广州  510275
Published: November 2020

The first-order structure of a polymer is an ideally perfect long molecule chain; electrons and ions in it make contribution to the fast polarization effect. The topological deformation of the long chain gives second-order structure, and the third-order structure consists of many deformed chains; both second and third-order structures of a polymer make contribution to the slow polarization. The frozen time domain dielectric spectroscopy method shows that in β transition of a polymer, the second- and thire-order structures will be softened but the first-order one does not change. Using this method, the slow and fast components of frozen polarizations in polymer can be kept apart.
PROPAGATION OF OPTICAL PULSE WITH TIME-SPACE ASYMMETRY IN SATURABLE SELF-FOCUSING KERR MEDIUM
Authors: LI JIAN-QING  , ZHOU GUO-SHENG  , YANG BO-JUN  , XU DA-XIONG  ,   (1)北京邮电大学电子工程系，北京  100876; (2)北京邮电大学基础科学部，北京  100876; (3)山西大学电子信息技术系，太原  030006; (4)山西大学电子信息技术系，太原  030006;北京邮电大学基础科学部，北京  100876;北京邮电大学电子工程系，北京  100876
Published: November 2020

The problem of propagation of (2+1)-dimensional optical pulse with time-space asymmetry in a saturable Kerr medium is discussed-That pseudo-momentum and energy of the optical pulse keep conservative along propagation is obtained by using variational method-The impacts of initial asymmetry,saturable strength and coupling strength on pulse width and beam width are studied by using numerical method-
THEORETICAL TREATMENT OF RADIATION TRAPPING OF ATOMIC FLUORESCENCE IN V-E ENERGY TRANSFER
Authors: WANG CHU-JI  , WANG JIAN  , MA XING-XIAO  ,   中国科学技术大学化学物理系，合肥  230026
Published: November 2020

A differential-integral equation system of Holstein type is used to describe the kinetic process in V-E energy transfer between molecules and atoms with radiation trapping.A reduced solution of a finite series has been presented,which allows to describe the whole temporal behavior of fluorescence.The further derivative is an analytical expression of the fluorescence decay rate as a function of rate constants and the maximum eigenvalue of the integral operator appearing in the rate equations.This will be especially useful and convenient for experimental determinations.Results are schematically illustrated and mutually compared by means of numerical calculations.
DETERMINATION OF THE ENERGY GAP OF C60 MOLECULE USING THIRD-ORDER DERIVATIVE ABSORPTION SPECTROSCOPY
Authors: ZHAO MING-SHAN  , DAI ZUO-XIAO  , LI YI  , LI GUO-HUA  , BU YU-XIANG  , YU ZHANG-YU  ,   (1)曲阜师范大学化学系，曲阜  273165; (2)曲阜师范大学物理工程学院，曲阜  273165
Published: November 2020

More detailed absorption transitions of C60 in the visible region are observed from the third-order derivative absorption spectra.The spectra are fitted with Lorentzian line shapes,and the transition energies are determined.The assignment of the transitions in visible region is discussed,some vibronic modes are given,and finally the energy gap of C60 molecule is determined.
THE FLUORESCENCE EMISSION FROM GaAs IN THE LAUE CASE NEAR THE ABSORPTION EDGE
Authors: XU ZHANG-CHENG  , GUO CHANG-LIN  , ZHAO ZONG-YAN  , T.FUKAMACHI  , R.NEGISHI  , M.YOSHIZAWA  , T.NAKAJIMA  ,   (1)安徽大学物理系，合肥  230039; (2)日本高能物理研究所光子工厂，茨城  305; (3)日本崎玉工业大学电子工学科，崎玉  369-02; (4)中国科学院上海硅酸盐研究所，上海  200050
Published: November 2020

The Ga K fluorescence X-rays emitted from the incident surface of GaAs perfect crystal were observed around the (200) reflection peak in the Laue case,while tuning the energies of incident X-rays from a synchrotron radiation source between the K absorption edges of the Ga and As atoms.With the change of the energies of incident X-rays,the asymmetry of the fluorescence X-ray curves will change accordingly,the tendency is similar to that in the Bragg case.However,the variation in the Laue case cannot be explained by the moving of the nodal planes of X-ray standing wave (XSW) with respect to (200) diffraction plane of GaAs.In the Laue case,the variation of the amplitudes of XSW with the incident angle is closely related to the phase of the structure factor,whose change will result in the change of the asymmetry of fluorescence curves.Under the assumption that the fluorescence yield is proportional to the electric field intensity at the position where the atoms are located,the formulae for calculating the fluorescence emission in the Laue case for perfect crystals are derived.The agreement of the experimental results with the new formulae is quiet good.
AXISYMMETRIC GUIDED WAVES IN CYLINDRICAL COMPOSITE STRUCTURES WITH WEAK INTERFACES
Authors: DU GUANG-SHENG  , WANG YAO-JUN  , YUAN YI-FENG  , ZHAO QING-CHANG  ,   南京大学声学研究所，近代声学国家重点实验室，南京  210093
Published: November 2020

Using the “spring” model for a weak interface and the wave equations in cylindrical composite structures, we derive the generalized frequency equation for axisymmetric guided waves in a two-layered cylindrical composite structure with a weak interface- Numerical computations are made for dispersion characteristics of the axisymmetric guided waves in two-layered composite tubes(with or without water in hollow) and clad rods with rigid or slip interfaces- The influence of the shear stiffness of the weak interface on the lower order guided wave modes is studied-
NONLINEAR OPTICAL RESPONSE OF EPITAXIAL YBa2Cu3O7-δ FILMS
Authors: XU KE-XI  , ZHOU SHI-PING  , BAO JIA-SHAN  ,   上海大学物理系，上海  201800
Published: November 2020

Experiments showed that the non-equiliubrium optical response of epitaxial YBa2Cu3O7-δ films below Tc existed with the illumination of He-Ne laser (λ=0.63μm). We have also found that near the transition region, where dR/dT is vanishing, the optical response becomes a strong nonlinear functions of current. A model was presented to explain the mechanism of the nonlinear behavior based on the interactions between photoexcited quasiparticles and the vortex in high Tc superconductor. We believe that the mechanism of the dissipation induced by light illumination in transition region may be correlated with the mechanism of “irreversibility line” or that of “broaden resistive transition” in magnetic fields.
THE FOAM-LIKE STRUCTURE OF SPACE-TIME AND THE CANCELLATION OF THE DIVERGENCE OF QUANTUM ELECTRODYNAMICS
Authors: LIU LIAO  ,   北京师范大学物理系，北京  100875
Published: November 2020

The new vertexes created from the space-time foam-like structure in quantum electrodynamics (QED) will cancel the three primitive divergences of lowest order in QED exactly.
X-RAY REEMISSION FROM GOLD DISK TARGETS HEATED BY SOFT X-RAY RADIATION
Authors: HUANG TIAN-XUAN  , SUN KE-XU  , HENG ZHI-JIAN  , YI RONG-QING  , DING YONG-KUN  , DING YAO-NAN  , CUI YAN-LI  , TANG DAO-YUAN  ,   西南核物理与化学研究所,成都  610003
Published: November 2020

X-ray reemission from gold disk targets,which were heated by intense soft X-ray radiation((2—6)×1012W·cm-2),had been observed with two time-related soft X-ray spectrometers-The spectra of X-ray reemission were “softer” than those of irradiating X-ray-Temporal evolution of the X-ray reemission was analyzed in terms of a time-modified self-similar solution for the ablative heat wave-
THE CLASSICAL THEORY FOR INTERACTION OF THE 1D H+2 WITH ULTRA-SHORT INTENSE LASER PULSE
Authors: QU WEI-XING  , HU SU-XING  , XU ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所，上海  201800
Published: November 2020

The dynamical process of interaction of the 1D H+2 with an ultra-short intense laser pulse is studied with a pure classical theory.Using the classical statistical method,we investigate numerically the evolutions of the probabilities for excitation,dissociation,ionization and dissociative ionization,and analyse the calculated results.
DISTORTED-WAVE CALCULATIONS OF THE ELECTRON-IMPACT IONIZATION FOR LOWLY AND MEDIUMLY IONIZED IONS
Authors: YAN SHI-XIANG  , CHEN CHONG-YANG  , TENG ZHOU-XUAN  , WANG YAN-SEN  , SUN YONG-SHENG  ,   (1)北京应用物理与计算数学研究所，北京  100088; (2)复旦大学李政道物理学综合实验室，复旦大学现代物理研究所，上海  200433
Published: November 2020

A distorted-wave Born exchange (DWBE) approximation is used to calculate the cross sections of electron-impact ionization for Ne+,…，Ne6+.The comparison shows good agreement between theoretical and experimental results.We give empirical formulas with high precision to meet the requirements of applications.The validity of the DWBE method in lowly ionized ions and the affect of the exchange potential on the calculated results are also discussed.
ANALYSIS AND SIMULATION OF FLUORINE MIGRATION CHARACTERISTICS OF BF+2-IMPLANTED INTO POLYCRYSTALLINE SILICON GATE
Authors: ZHANG TING-QING  , LI JIAN-JUN  , LIU JIA-LU  , ZHAO YUAN-FU  ,   (1)骊山微电子学研究所，临潼  710600; (2)西安电子科技大学微电子学研究所，西安  710071
Published: November 2020

The migration equation of fluorine in polycrystalline silicon gate is presented on the basis of analysis for the migration characteristics of fluorine in polycrystalline silicon gate after BF+2 is implanted into polycrystalline silicon gate.The distribution of fluorine in polycrystalline silicon gate is simulated by the finite difference methods.The simulation results are in good agreement with the experiments.Under the condition of 80keV,2×1015cm-2BF+2 implanted into polycrystalline Si gate and then annealed at 900℃ for 30s,some important coefficients are given as follows: emisson coefficient of fluorine in polycrystalline silicon e=6×10-2s-1,diffusion coefficient of fluorine in grain boundary Db=7.64×10-12cm/s,absorption coefficient of fluorine in polycrystalline Si/SiO2 interface S1=1.74×10-3s-1 and damage absorption coefficient of fluorine in polycrystalline silicon S1=7.32×10-4s-1.
SELF-DIFFUSION OF ADATOMS ON Ag,Pt,Au(110) SURFACES
Authors: XIANG SONG  , ZHUANG  JUN  , LIU LEI  ,   复旦大学物理系，三束材料改性国家重点联合实验室，上海  200433
Published: November 2020

Self-diffusion of adatoms on Ag,Pt,Au(110) surfaces is investigated with the surface embed-ded atom method(SEAM) and molecular dynamics.By quenched molecular dynamics,the static energy variation and the pathway of the atoms for hopping and exchange mechanisms are obtained.The self-diffusion characteristics of these metals are analyzed,and the results show that the diffusion is isotropic on Pt(110) surface but anisotropic on Au,which are in accordance with the observation in experiments.
A NEW METHOD FOR OBTAINING MLLER TRANSFORMATION
Authors: WU SHENG-MIAO  , ZHANG JING-YI  ,   (1)蚌埠坦克学院物理室，蚌埠  233013; (2)广东石油化工专科学校物理室，茂名  525000
Published: November 2020

In this paper the explicit form of composite transformation of n successive Lorentz transformation was obtained, from which the transformation from accelerating system to inertial one was deduced, and the application range of Mller transformation was extended.
PHOTOLUMINESCENCE STUDY ON HYDROGENATED NANO-CRYSTALLINE SILICON FILM
Authors: LIU MING  , HE YU-LIANG  , JIANG XING-LIU  , LI GUO-HUA  , HAN HE-XIANG  ,   (1)北京航空航天大学应用物理系，北京  100083; (2)中国科学院半导体研究所半导体超晶格国家重点实验室，北京  100083
Published: November 2020

Light-emitting hydrogenated nano-crystalline silicon (nc-Si∶H) films have been fabricated using plasma-enhanced chemical-vapor deposition method.It was found that photoluminescence(PL) properties are directly related to grain size and surface strucuture.The quantum size effect and surface states model was proposed to explain PL.Meanwhile,temperature dependence of PL peak energy and integrated intensity are also studied.The former is mainly caused by band-gap shrinkage and the PL intensity decrease with increasing temperature can be interpreted using a temperature independent radiative term and a temperature-dependent thermally activated non-radiative one.
STUDY ON THE COMPOSITION AND CRYSTALLIZING CHARACTERISTIC OF AMORPHOUS COMPOSITE FABRICATED BY SELF-CATALYZING DEPOSITION
Authors: WU YU-CHENG  , ZHANG LI-DE  , LI GUANG-HAI  , TAO JIE  ,   (1)南京航天航空大学，南京  210016; (2)中国科学院固体物理研究所，合肥  230031
Published: November 2020

The amorphous (Ni,Cu)100-xPx+SiC composites were fabricated by self-catalyzing deposition, and the composition and crystallization characteristics were studied. The results showed that the composites kept at amorphous state when x was more than 14 or the fraction of SiC less than 12.8%; they would transform gradually into crystalline with the increase of aging temperature at 603—618K; and the crystallized phases were fcc Ni and NiyPz respectively; (Ni,Cu)P+Ni3P+SiC was formed as a stable microstructure. Compared with amorphous composites, crystalline materials exhibited higher machanical properties.
NEXAFS INVESTIGATION OF c(22)(K+CO) COADSORPTION ON Co{1010} SURFACE
Authors: WANG LEI  , TANG JING-CHANG  ,   浙江大学物理系和硅材料科学国家重点实验室，杭州 310027
Published: November 2020

Theoretical studies of oxygen 1s NEXAFS of c(22)(K+CO) adsorption on Co{1010} surface have been performed by the multiple-scatterring cluster method(MSC).The results show that the bond-length of adsorbed CO molecule is longer than that of the gas-phase one by about 0.01nm.The comparison between the calculated spectra and the experimental data demonstrates that a new weak -like structure appears on the right of the original resonance.This structure comes from the indirect interaction to CO molecule due to K atoms and the substrate.
THE SIMULATION OF 6a10 BAND AND THE DETERMINATION OF ROTAIONAL CONSTANTS IN THE (2+3)PRMPI SPECTRA OF B1(nπ*) STATE IN PYRIDINE
Authors: ZHAO QING-CHUN  , LIN MEI-RONG  , ZHANG BAO-ZHENG  , LI YUN-JING  , CHEN WEN-JU  ,   南开大学现代光学研究所,天津  300071；南开大学光学信息技术科学开放研究实验室,天津  300071
Published: November 2020

Through simulating the 6a10 band with a partly resolvable rovibronic contour in the (2+3)PRMPI spectra of B1(nπ*) state in pyridine, the rotational constants in B1(nπ*) state are obtained as follows: A′=0.21670cm-1, B′=0.16758cm-1, C′=0.09450cm-1, showing that the negative electricity of N itself becomes weak after one of its lone-pair electrons transits to π* orbital, and the molecular frame expands in general. Moreover, comparing the experimentally measured band with the theoretical curve of 6a10, two vibronic bands, 17a106a101210 and 11b10, which are drowned under the high intensity of 6a10 and have never been reported before, are found.
RAMAN SPECTRUM STUDY OF PHONON MODES FOR SINGLE-WALL CARBON NANOTUBES
Authors: LI HONG-NIAN  , XU YA-BO  , LI HAI-YANG  , HE PEI-MO  , BAO SHI-NING  ,   浙江大学物理系，杭州  310027
Published: November 2020

The first and second-order Raman spectra were measured for single-wall carbon nanotubes (SWNTs). Eighteen first-order Raman spectral lines and seven second-order Raman spectral lines were observed. Spectral lines predicted by theory were almost fully detected. Positions of the spectral lines observed are well coincident with theoretical values. The number of Raman active phonon modes and the second-order Raman spectral lines for high-purity SWNTs observed is the biggest up to date.
SPECTRAL DENSITY FOR THE TUNNELING CURRENT ZERO-FREQUENCY SHOT-NOISE IN A ONE-DIMENTIONAL MESOSCOPIC SYSTEM
Authors: ZHU ZHU-XIANG  , ZHENG DA-FANG  , LIU YOU-YAN  ,   (1)华南理工大学物理系，广州  510641；中国科学院国际材料物理中心，沈阳  110015; (2)华南师范大学物理系，广州  510631
Published: November 2020

We have derived the expression of the spectral density for the current shot-noise in terms of the nonequilibrium Green's functions(closed-path Green's functions) for a one-dimentional mesoscopic junction, and performed numerical calculations to discuss the dependence of the zero frequency spectral density for the currentshot-noise on other variables when the tunnling junction is pure or impure.
A NEW WAY FOR MEASURING INTERDIFFUSION COEFFICIENT OF LIQUID METAL——SOLID/LIQUID-LIQUID/SOLID TRILAYER SYSTEM
Authors: ZHAO JIAN-HUA  , LIU RI-PING  , ZHOU ZHEN-HUA  , ZHANG XIANG-YI  , ZHANG MING  , XU YING-FAN  , WANG WEN-KUI  ,   (1)中国科学院物理研究所，北京  100080; (2)中国科学院物理研究所，北京  100080；燕山大学材料工程学院，秦皇岛  066004
Published: November 2020

A new way for the study of diffusion processes in liquid metals in solid/liquid-liquid/solid trilayer systems is proposed-The design of this kind of trilayers enables diffusion processes to take place,without effect of gravity-induced convection and Marangoni-convection-The Ta/Zn-Sn/Si trilayers were selected as an example and the interdiffusion of liquid zinc and tin at 500℃ was investigated-
PROPAGATION PROPERTIES OF DOUBLE LASER PULSE IN COHERENT MEDIUM
Authors: XIAO LING  , DING GANG  , JING CHUN-YANG  , LIN FU-CHENG  ,   中国科学院上海光学精密机械研究所，上海  201800
Published: November 2020

Based on the Bloch-Maxwell equation,the three-dimensional model for the double-pulse propagation in a two-level system was set up-The propagation of the double pulses with different areas has been described and compared to that of the single pulse-The pulse mergence has been found in the double-pulse propagation-