bluuebunny/crossref_metadata_2025 huggingface dataset:
INVESTIGATIONS OF THE STRUCTURAL AND CONDUCTIVE PROPERTIES OF CONDUCTING POLYMER PEU BY POSITRON ANNIHILATION
Authors: WANG BO  , PENG ZHI-LIN  , WU WAN  , LI SHI-QING  , WANG SHAO-JIE  , LIU HAO  , XIE HONG-QUAN  ,   (1)华中理工大学化学系; (2)武汉大学物理系
Published: November 2020

Positron annihilation lifetime spectra have been measured for polymer electrolyte poly (ether urethane) (PEU). The variations of the positron annihilation parameters as a function of Li - dopant concentration show that the Li - dopants diffuse mostly into the amorphous regions. The temperature dependances of the o - Ps lifetime and its intensity give the information about the structural transition of PEU and PEU - LiClO4. The relation between the conductivity of PEU - LiClO4 and temperature can be explained by the theory of free volume.
A STUDY OF DEEP UNDERCOOLING FOR Al-Cu-Fe ICOSAHEDRAL QUASICRYSTAL
Authors: CHEN LI-FAN  , CHEN XI-SHEN  ,   中国科学院物理研究所
Published: November 2020

This work was undertaken to study deep underccoling of Al65Cu20Fe15 alloy melt in Al- Cu - Fe system by cyclic superheating and cooling method. By means of the denucleating technique, Al65Cu20Fe15 alloy melt has been undercooled to 98 K under its melting point, and Al - Cu - Fe icosahedral quasicrystalline ball of 6 mm in diameter was produced. Moreover,the first phase to nucleate will change with the degree of underccoling in alloy melt. It was confirmed that quasicrystal forming ability can be enhanced by increasing the level of denu-cleating in Al65Cu20Fe15 alloy.
THE QUANTUM THERMAL AND NON-THERMAL EFFECTS IN THE SPACE-TIME DETERMINED BY GSSEC BLACK HOLE
Authors: ZHANG JIAN-HUA  , MENG QING-MIAO  , LI CHUAN-AN  ,   山东省菏泽教育学院物理系,菏泽274016
Published: November 2020

The Hawking radiation and the Starobinsky - Unruh process of Dirac particles in space-time determined by the generalized spherical symmetric evaporating charged (GSSEC) black hole are studied.
LUND MODEL AND THE SPECTRA OF THE ULTRA-RELATIVISTIC QUANTUM SYSTEM
Authors: ZHU DONG-PEI  , WANG REN-CHUAN  , YANG LI  ,   中国科学技术大学近代物理系,合肥230026
Published: November 2020

The energy spectral problem of the ultrarelativistic quantum systems is investigated. A typical ultrarelativistic system (the Lund model) is solved exactly and a new virial theorem is proved, these are to show the influence of the form of kinetic energy to the energy spectra.
CLASSICAL THEORETICAL ANALYSIS OF RADIATIONS FIELDS IN THE FREE ELECTRON LASER
Authors: ZHAO DONG-HUAN  , LEI SHI-ZHAN  ,   中国科学院上海光学精密机械研究所,上海201800
Published: November 2020

The radiations fields of FELs are analysed by using the classical electrodynamics. The general characteristics of radiation fields are discussed, and the mathods of self-consistent solutions for the radiation fields of FELs are establised systematically by using the Maxwell equations, wave equation, continuity equation of electron, Lorentz force equation and energy equation of relativistic electrons.
LIE ALGEBRAIC APPROACH TO THE MITLTIPHOTON EXCITATION OF VIBRATIONAL STATES OF DIATOMIC MOLECULES IN INTENSE LASER FIELDS
Authors: YUAN FENG  , DING SHI-LIANG  ,   山东大学理论化学研究室
Published: November 2020

The multiphoton vibration excilation of diatomic molecules in intense laser fields arestudied by using the simulated poltjnllal-Lie Algebra. It is calculated that the transition prob-abilities of the molecule change with the external field frequencies and time. The effect of two laser fields on the probabilities is discussed.
EXCITED DEGENERATE FOUR-WAVE MIXING
Authors: YANG YAN-QIANG  , FEI HAO-SHENG  , WEI ZHEN-QIAN  , SUN GUI-JUAN  ,   吉林大学物理系,长春130023
Published: November 2020

Excited state degenerate four-wave mixing in a four-level saturable system is treated theoretically and experimentally. The results show that the external pump feild influences intensely the intensities of the PC signals.
SELF-PHASE MODULATION IN CHIRPED-PULSE AMPLIFICATION
Authors: SHEN YU-ZHEN  , WANG QING-YUE  , XING QI-RONG  , SHI JI-YING  ,   天津大学精密仪器系,天津300072
Published: November 2020

Based on semiclassical approach, the transport equations of chirped-pulse amplification are presented. Time-and spectral-domain evolution of chirped pulse and effects of self-phase modulation in multipass amplification are numerically analyzed. Theoretical results show that the new frequency chirp induced by self-phase modulation changes the instantaneous frequency of chirped pulse and affects the quality of amplified pulse. The study of chirped-pulse amplification in the gain saturation regime shows that the linear frequency chirp of input pulse tends to suppress the effects of self-phase modulation.
NUMERICAL SIMULATION AND SCALING LAW OF ABSORPTION OF GOLD DISK TARGETS IRRADIATED BY 1.05 AND 0.53μm LASER
Authors: LIU SHEN-YE  , FU LI-BIN  , ZHANG HAI-YING  , DING YAO-NAN  , LIU ZHONG-LI  , ZHENG ZHI-JIAN  , TANG DAO-YUAN  , CHEN HAN-DE  ,   西南核物理与化学研究所,成都610003
Published: November 2020

Au disk targets were irradiated with -0.8 ns, 1.05 and 0.53 μm laser. The intensity and angular dependence of absorption were studied experimentally. The experimental results of absorption by laser-produced plasma are introduced in this paper. The measured absorption with plasma calorimeters accord with one-dimension planar simulation. The experiment and theory show that collision absorption is the main absorption mechanism. A scaling law of absorption has been suggested based on the careful analysis of the experimental results.
PHOTOVOLTAGE SPECTROSCOPY STUDY OF GaAs/AIGaAs MULTIPLE QUANTUM WELLS
Authors: ZHU WEN-ZHANG  , SHEN QI-HUA  ,   (1)集美航海学院物理室,厦门361021; (2)厦门大学物理系,厦门361005
Published: November 2020

The photovoltage spectra of GaAs/AlGaAs multiple quantum wells (QMWs) in which the substrates are semiinsultion GaAs have been studied at temperatures ranging from 18 to 300 K. A series of distinct excition absorption peaks were observed. At low temperature, the photovoltage spectra reflect the steplike distribution of state density of QMWs. It is believed that the photovoltage spectroscopy is an effective technique for inspecting the growing quanli-ty of QMWs and superlattice. The changes of photovoltage with temperature and the mechanism of photovoltaic effect are also discussed.
ELECTRICAL CHARACTERIZATION OF SOLID C60/Si HETEROJUNCTIONS——RECTIFYING PROPERTIES, ENERGY-BAND MODELS, AND BIAS-TEMPERATURE EFFECT
Authors: CHEN KAI-MAO  , JIA YONG-QIANG  , JIN SI-XUAN  , WU KE  , LI CHUAN-YI  , GU ZHEN-NAN  , ZHOU XI-HUANG  ,   (1)北京大学化学系,北京100871; (2)北京大学物理系,北京100871
Published: November 2020

This work investigates electrical properties of contacts between undoped solid C60 and n-or p-type Si. Current-voltage measurements show that the two contacts result in strong rectification with opposite conduction directions, indicating two different kinds of barriers for carrier transportation at the interface of the two contacts. Current-temperature measurements show that the current is an exponential function of reciprocal temperature, from which we estimate the effective barrier height to be 0.30 and 0.48 eV for C60/n-Si and C60/p-Si, respectively. Within energy-band models we interpret successfully the above experimental results. Based on the energy-band model and experimental data we derived the electron affinity of solid C60 film to be 3.92 eV and its energy gap to be below 1.72 eV. Highfrequency capacitance-voltage measurements show that biastemperature treatments have considerable effect on the C-V characteristics of the heterojunction. Assuming the existence of mobile negative charges in the solid C60 film we explain the effect successfully and estimate the density of the negative charges to be 3.1×1012cm-2. By use of the C-V results we determine the dielectric constant of the solid C60 film to be 3.7±0.1 in the temperature range of 300-370 K.
STUDY ON THE QUANTUM CONFINED STARK EFFECT OF InGaAs/InAlAs MULTIPLE QUANTUM WELL STRUCTURES
Authors: YU QIAN  , WANG JIAN-HUA  , LI DE-JIE  , WANG YU-TIAN  , ZHUANG YAN  , JIANG WEI  , HUANG YI  , ZHOU JUN-MING  ,   (1)清华大学电子工程系集成光电子学国家重点实验室,北京100084; (2)中国科学院半导体研究所国家光电子工艺中心,北京100083; (3)中国科学院物理研究所,北京100080
Published: November 2020

The quantum confined stark effect of InGaAs/InAlAs MQW heterostructures lattice-matched to InP substrate, grown by Chinese-built molecular beam epitaxy (MBE) system, is observed by absorption photocurrent spectra measurements, as well as the anisotropic elec-troabsorption of MQWs. The structure parameters of the epitaxied materials, which can be used to fabricate waveguide MQW electroabsorption modulators, were determined from double crystal X-ray diffraction measurements and computer simulations. The theoretical calculations of absorption-edge red shift compared with experimental results shows that the built-in-potential of the p-i-n junction can not be neglected.
RESISTIVE TRANSITION BROADENING AND FLUX PINNING OF HIGH Jc Ag-SHEATHED Bi(2223) TAPE
Authors: JIANG JIAN-YI  , HU AN-MING  , SUN YU-PING  , ZHANG FA-PEI  , DU JIA-JU  ,   (1)中国科学院固体物理研究所,合肥230031; (2)中国科学院固体物理研究所,合肥230031;中国科学技术大学结构分析开放研究实验室,合肥230026
Published: November 2020

The resistive transition broadening of high Jc Ag-sheathed Bi(2223) tape has been systematically investigated in the field range of 0 to 1T. The experimental result shows that the resistive transition is of the thermally activated behavior. The relation between the flux pinning and the temperature has been studied. The temperature dependence of resistance is R(T) = R0exp [-μ0(1-T/Tc)n/kT] ,where n=4.5 for H//ab plane and n=3 for H⊥ab plane. When the magnetic field is parallel to ab plane, the dissipation is independent of the Lorentz force and only depends on the magnitude of the magnetic field parallel to ab plane. This behavior can be explained in terms of thermally activated pancakelike vortex-an-tivortex pair model. The mechanism of the flux pinning of the Bi-system material is discussed .
IMPROVING THE STABILITY OF POROUS SILICON PHOTOLUMlNESCENCE BY DAMP OXIDATION
Authors: CHEN HUA-JIE  , ZHANG FU-LONG  , FAN HONG-LEI  , CHEN XI-YING  , HUANG DA-MING  , YU MING-REN  , HOU XIAO-YUAN  , LI GU-BO  ,   (1)复旦大学应用表面物理国家重点实验室,上海200433; (2)四川工业学院物理实验室,成都611744
Published: November 2020

The bright and stable porous silicon have been obtained by using damp oxidation at moderate temperature. EPR measurements showed that the density of Si dangling bonds in the sample is lower than that by dry oxidation. We also took FTIR measurements and concluded that the stabilization of the photoluminescence from porous silicon is due to the formation of SiH(O3), SiH(SiO2) and SiH(O2) structure.
ANISOTROPIC HYPERFINE INTERACTIONS IN Fe4N ALLOY
Authors: LI ZI-RONG  , MENG QING-AN  , GAO QI-JUAN  , SUN KE  , WEI YU-NIAN  ,   中国科学院物理研究所磁学国家重点实验室,北京100080
Published: November 2020

The nuclear magnetic resonance spectrum of 57Fe nuclei in γ - Fe4N alloy has been observed by the coherent spin-echo method. The peculiar line shape of nuclear magnetic resonance of Fe Ⅱ arises from the anisotropic hyperfine interactions and the domain wall excitation.
PHASE TRANSITION IN POLYCRYSTALLINE FERROELECTRIC THIN FILMS——STRESS AND SIZE EFFECTS
Authors: LIU WEI-GUO  , KONG LING-BING  , ZHANG LIANG-YING  , YAO XI  ,   西安交通大学,西安710049
Published: November 2020

It is experimentally investigated by glancing angle X-ray diffraction (GAXRD) that the phase transition temperature and structure parameters of surface layer and differing from those of bulk layer in polycrystalline PbTiO3 ferroelectric thin film. The polycrystalline ferro-electric thin film is phenomenologically treated as a double layers structure: the surface layer is characterized as fine crystalline and low stressed, the bulk layer is characterized as large crystalline and high stressed. According to the influences of size and stress effects, the feature of phase transition of PbTiO3 polycrystalline ferroelectric thin film is described.
CRYSTAL GROWTH IN A HIGH MAGNETIC FIELD
Authors: KANG JUN-YONG  , TOZAWA SHINIRRO  ,   (1)东北大学金属材料研究所,仙台980,日本; (2)厦门大学物理系,厦门361005
Published: November 2020

A vertical gradient freeze apparatus was set up to investigate the crystal growth in high magnetic field. In the presence and absence of a magnetic field, temperature profiles were measured from solid-liquid interface to over Te-doped InSb melt, and InGaSb with low GaSb mole fraction and Te-doped InSb crystals were grown. The results of investigation show the high magnetic field of 8.00T can improve the quality of InGaSb crystal and the homogeneity of axial profile of Te impurity. These results are considered to be the consequence of the improvement of stability and the reduction of convective velocities of the melts in the high magnetic field.
MODELLING OF MULTI-ION-BEAM REACTIVE COSPUTTERING OF METAL OXIDE THIN FILMS (I)——ESTABLISHMENT OF THE MODEL
Authors: XIAO DING-QUAN  , WEI LI-FAN  , LI ZI-SEN  , ZHU JIAN-GUO  , QIAN ZHENG-HONG  , PENG WEN-BIN  ,   四川大学材料科学系,成都610064
Published: November 2020

Reactive sputtering is a very useful technique for fabricating oxides and other compound thin films. Very recently, we developed a technique named multi-ion-beam reactive conputtering (MI-BRECS) for preparing multi-component metal oxide thin films. In order to promote the development of this technique, it is necessary to investigate the mechanisms of thin film growth of reactive cosputtering. Based on the well-known gas kinetics, we established a fundamental model of multi-ion beam, multi-target reactive cosputtering under stable sputtering circumstances, and obtained the relationships between both the deposition rate and composition of thin films and the controllable reactive cosputtering parameters. This model reveals the essential parameters that affect the composition of thin films and the methods for controlling the deposition rate and the composition of thin films can be obtained from the model.
THE OPTIMAL ORIENTATION OF MARTENSITIC NUCLEATION UNDER DIFFERENT STRESSES
Authors: HU SHEN-YANG  , ZHE XIAO-LI  , LI YU-LAN  ,   (1)兰州大学材料系,兰州730000; (2)兰州大学力学系,兰州730000
Published: November 2020

The total-energy change is systematically evaluated in this paper when the thin ZrO2(T) ellipsoidal plate at different orientation transforms into ZrO2(M) under extension, compression and shear stresses. The optimal orientation of Martensitic uncleation is determined by using the oriterion of minimum energy. The numerical results show that the shear strains resulting from the transformation affect obviously the orientation of Martensitic nucleation and the critical stresses inducing transformation are very different.
MODELLING OF MULTI-ION-BEAM REACTIVE COSPUTTERING OF METAL OXIDE THIN FILMS (Ⅱ)——NUMERICAL CALCULATION AND RESULTS DISCUSSION
Authors: XIAO DING-QUAN  , WEI LI-FAN  , LI ZI-SEN  , ZHU JIAN-GUO  , QIAN ZHENG-HONG  , PENG WEN-BIN  ,   四川大学材料科学系,成都610064
Published: November 2020

The numerical calculation for the model of a multi-ion-beam reactive cosputtering (MI-BRECS) system which we presented very recently in a related paper has been carried out with the parameters adopted in our experiments to prepare PbTiO3 thin films by using Pb and Ti metal targets and MIBRECS technique. The relationships among the sputtered ratio Ri of each target, the partial pressure p of reactive gas in the deposition chamber, and the coverage ratioes Zsmi, Zsli, and Zshi of the simple substances and oxide compounds of Pb and Ti on the substrate surface, with the total reactive gas flux Q and the densities Ji of the sputtering ion beam (both of which can be adjusted independently) are obtained respectively. The calculated results reveal the hysteresis effect which is an essential characteristics in a reactive sputtering, and show that there is a coupling and interaction among the processing parameters in ion beam reactive cosputtering. The relations among the atom ratio and the chemical valences of the elements in prepared thin films with the controllable processing parameters in ion beam reactive cosputtering are obtained, and the method to control and adjust a MIBRECS system for stable reactive cosputtering process is pointed out. The obtained results a-gree with our experiments.
THE DESCRIPTION OF DOUBLE WAVE FUNCTION OF PARTICLE MOTION IN THE REFLECTIONLESS POTENTIAL WELL
Authors: LIN KUN-ZHI  ,   吉林省通化师范学院物理系,通化134002
Published: November 2020

In this paper, double wave function quantum theory is applied to obtain a time evolution equation to describe the physical quantities of single motional particle in the reflectionless potential well. The ordinary formula to calculate mean values in quantum mechanics can be described as the average of double wave function of a certain ensemble.
EFFECTS OF AC STARK SHIFTS ON COHERENT POPUALTION TRAPPING IN THE NONDEGENERATE TWO-PHOTON JAYNES-CUMMINGS MODEL
Authors: LI GAO-XIANG  , PENG JIN-SHENG  ,   华中师范大学物理系
Published: November 2020

We have studied the population trapping properties in the nondegenerate two - photon Jaynes-Cummings model in the presence of ac Stark shifts. The important influences of ac Stark shifts on the field inducing the atom to be trapped (called inducing trapping field) are pointed out and the properties of this field are analyzed.
EXPERIMENTAL INVESTIGATION OF RADIATION TEMPERATURE IN HOHLRAUMS
Authors: YI RONG-QING  , MIAO WEN-YONG  , SUN KE-XI  , CHUI YAN-LI  , ZHENG ZHI-JIAN  , TANG DAO-YUAN  ,   西南核物理与化学研究所,成都610003
Published: November 2020

Radiation temperature in hohlraums is diagnosed using two soft X-ray spectrometers and multi-pinhole soft X-ray streak camera. We have improved the accuracy taking plasma closure effects of the diagnostic hole into consideration. We have obtained 2D-images and processes of the hole closure and radiation temperature in the hohlraums νs time. A preliminary model of the closure effect of diagnostic hole is proposed based on the experimental data.
TRANSPORT IN HYDROGENATED AMORPHOUS SILICON AT LOW TEMPERATURES
Authors: ZHU MEI-FANG  ,   中国科学技术大学研究生院物理系,北京100039
Published: November 2020

Thermally stimulated conductivity (TSC) theory based on multiple trapping(MT) model in amorphous semiconductors is limited to explain TSC in a-Si: H at low temperatures in which the low temperature peak of TSC σTSC( TM) is independent of the starting temperature T0. TM is pinked. In this paper, a model of the hopping conduction with the transport energy Et in the band tail is proposed to understand the behavior of the low temperature TSC. Hopping frequency, thermal emission rate and temperature dependence of Et were calculated. TM is suggested to be corresponding to a change of the transport mechanism from hopping conduction to MT model.
ENERGY CONVERSION OF FREE ELECTRON LASER
Authors: ZHU JIA-QING  ,   华中师范大学物理系
Published: November 2020

According to the Weizsacker-Williams approximation, FEL Is simulated by collision between the relativistic electron and the pseudophoton, and the photon is scattered by the electron. According to this physical model, we studied the energy conversion between the electron and the photon, and obtained the relation between the energy of scattered photon and the energy of photon before collision:εp=4γ2εp(0). Increase of the energy of the scattered photon is at the price of the energy that the electron consumes. We calculated the scale of the energy conversion. In FEL, the maximum energy conversion efficiency is 50 %.
ULTRASONIC ATTENUATION IN FIBER REINFORCED COMPOSITES
Authors: ZHU WEI-YONG  , BANG YAO-JUN  , NING WEI  ,   南京大学声学研究所
Published: November 2020

In order to evaluate the attenuation in fiber reinforced composites due to scattering, the multiple scattering should be taken into account when the volume concentration of fibers is large. This paper presents a method for calculating the effective incident wave field in the composites. The contribution of the scattered transverse waves to the incident longitudinalwave propagating perpendicularly to the fiber axis is shown to be zero. An explicit expression for ultrasonic attenuation coefficient with the multiple scattering included is derived. The influence of multiple scattering on the attenuation coefficient is numerically evaluated in a fiber/aluminum composite.
MODIFACATION OF ULTRA-SHORT SOLITON-PAIR EVOLUTIONS IN FIBERS BY MEANS OF FREQUENCYSPECTRUM CONJUGATE INVERSION
Authors: QU LIN-JIE  , QU XIN  ,   天津大学精密仪器系,天津300072
Published: November 2020

In this paper we demonstrate theoretically and numerically that the conjugate inversion of the frequency spectra of solitons , periodically along the optical fiber lines, can restrain effectively both the interactions among the solitons and the influence of the self-frequency shift of the solitons on the ultra-short soliton-pair propagations.
THE WAKE FIELD ACCELERATION IN THERMAL PLASMA
Authors: LI YI  ,   中国科学技术大学地球和空间科学系,合肥230026;第三世界科学院中国科学技术大学地球科学和天文学高级研究中心
Published: November 2020

We obtain the wake field equation in thermal plasma by calculating the distribution function of the base plasma which temperature is not too high. This equation is helpful to study how to maximize the efficiency of wake field acceleration in thermal plasma. We also discuss the influence of temperature on plasma wake field acceleration.
RESPONSE OF A SPIN-3/2 NUCLEAR QUADRUPOLE RESONANCE SYSTEM TO COMB-PULSE TRAIN FOR POWDERED SAMPLES
Authors: LI GENG-YING  ,   华东师范大学分析测试中心,上海200062
Published: November 2020

The response of an I=3/2 nuclear quadrupole resonance(NQR) system to a comb-pulse train is calculated by means of the density matrix theory and computer simulations. The influence of the off-resonance( including inhomogeneous line broadening) upon the comb-pulse NQR powder line shape is also discussed in detail. It was found that under the condition of small off-resonance, the comb-pulse NQR spectrum is analogous to that obtained with the two-dimensional nutation NQR technique, but the time required to perform the comb-pulse experiment is nearly two orders less than that required by the latter.
A NEW METHOD:CH3CSNH2/NH4OH PASSIVATED GaAs (100) SURFACE BY SRPES INVESTIGATION
Authors: LU ER-DONG  , XU PENG-SHOU  , YU XIAO-JIANG  , XU SHI-HONG  , PAN HAI-BIN  , ZHANG XIN-YI  ,   中国科学技术大学国家同步辐射实验室,合肥230026
Published: November 2020

We have developed a new method to treat GaAs (100) surface by CH3CSNH2/NH4OH solution Synchrotron Radiation Photoemission Spectroscopy (SRPES) and X-ray Photoemission Spectroscopy (XPS) have been used to investigate the chemical states and electronic states of the passivated GaAs (100) surface. The results show that the sulfides of Ga and As were formed on CH3CSNH2/NH4OH solution treated GaAs(100) surface . and the oxides of Ga and As were removed . The treatment has an apparently passivating role for the GaAs. After annealing for the passivated surface , band bending effect was observed and the offset of 0.22 eV toward the higher binding energy was obtained this meant that the densenty of the states of GaAs surface was decreased.
SYMMETRIES OF THE(2 +1) DIMENSIONAL DISCRETE Toda EQUATION
Authors: QIAN XIAN-MIN  , LOU SEN-YUE  ,   (1)复旦大学李政道物理学综合实验室物理系,上海200433;宁波师范学院物理系,宁波315211; (2)绍兴师范专科学校物理系,绍兴312000
Published: November 2020

We extend the formal series symmetry theory proposed in Refs. [1-4] to the (2 + 1) dimensional discrete Toda equation. Two sets of infinitely many symmetries of this equation are found. Every one set of symmetries constitute a generalized W∞ algebra which contains the usual W∞ algebra as its subalgebra.
THE EFFECT OF GEOMETRICAL FACTOR OF DISPERSED PHASE PARTICLES ON THE RESPONSE TIME OF ELECTRORHEOLOGICAL FLUID
Authors: GUO HONG-XIA  , MAI ZHEN-HONG  ,   中国科学院物理研究所
Published: November 2020

Instantaneous response time is an important parameter of electrorheological (ER) fluids.Based on the expetiment and theoretical analyses, a model of response time of ER fluid re garding the geometrical factor of dispersed phase particles is established. According to the model, for the same particle volume of the dispersed phase particles the response time of the ER fluid which consists of prolate ellipsoid particles is shorter than that of the ER fluid which consists of sphere-like particles, while the response time of the ER fluid which consists of oblate ellipsoid or laminar-like particles is longer than that of the ER fluid which consists of sphere-like particles, and the response time of the ER fluid which contains rod-like particles is shorter or longer than that of the ER fluid which contains sphere-like particles depending on the value of εp/εf. The relationship between the response time and the size of particles isthat (1) with the increase of the particle volume, the response time of ER fluids containing different shape particles decrease; (2 ) under the same volume, with the increase of the prolateradius ratio, the response time of ER fluid containing prolate ellipsoid particles decreases,while the response time of ER fluid containing oblate ellipsoid or larninar-like particles in creases, and the response time of ER fluid containing rod-like particles increases or decreasesin accordance with the value of εp/εf. In order to get ER fluid with short response time, be sides sphere-like particles other shapes such as prolate ellipsoid and rod-like particles with a given size can be choosed at a low Reynold number.
THEORETICAL STUDY ON ELECTRONIC STRUCTURE OF C60 MOLECULE
Authors: LIU LEI  , TONG XIAO-MIN  , LI JIA-MING  ,   (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;复旦大学物理系和三束材料改性国家重点实验室,上海200433
Published: November 2020

Based on multiple-scattering self-consistent-field method, we have investigated the electronic structrue of molecular bonding orbital and molecular Rydberg orbital in a unified manner for a C60 molecule. The results have been compared with other theoretical and experimental data and our calculated transition energies are in a fairly good agreement with experimental observations. Our results can be used to indentify the experimental spectra. Furthermore, our calculated quantum defects for Rydberg series can be used to study the corresponding collision process of "e+ C60+".
A STUDY OF MgF2 AS A DIFFUSION SOURCE FOR Mg-ION INDIFFUSION LITHIUM NIOBATE SINGLE CRYSTAL
Authors: QUE WEN-XIU  , YAO XI  ,   西安交通大学电子材料研究室
Published: November 2020

A study of the Mg-ion indiffusion of lithium niobate single crystal substrate is made by MgF2 as a diffusion source. By means of electron probe microanalysis, the Mg-ion concentra tion of the Mg diffused layer is obtained, which is approximately a half parabolic and step profiles. The activation energy of Mg-ion indiffusion is 104 kJ/mol. It is found by X-ray diffraction analysis that in the Mg diffused layer LiNb3O8 compound appears with Mg-ion in diffusion beyond a certain extent. The appearance of LiNb3O8 compound is related to the Li ion outdiffusion from the bulk of lithium niobate and existence of a great deal of F-ion at the diffused surface. It is observed by scanning electron microscopy that the F-ion is in the form of LiF and LiF will go away from the surface of the Mg diffused layer with increasing of Mg ion indiffusion degree.
STABILITY ANALYSIS OF TOKAMAK RESISTIVE INTERNAL KINK MODE IN ION KINETIC REGIME
Authors: SHI BING-REN  , SUI GUO-FANG  , GUO GAN-CHENG  ,   核工业西南物理研究院,成都610041
Published: November 2020

In this paper, we use the dispersion relation of Tokamak internal kink mode in ion kinetic regime to analyse the frequency and the growth rate of s0, the magnetic shear. We find that there is a critical shear s0c , and the resistive internal kink mode can only be excited when s0>s0c, i. e. , when q00c0 case, the growth rate of the resistive internal kink mode is several times of that obtained from the MHD regime, which is consistent with the fast crash phenomena of sawtooth. Comparison has been made of the results with experiments in the HL - 1 device for sawtooth stabilization or its period prolongation in case of hydrogen pellet refueling.
STUDY ON THE CRYSTALLIZATION OF AMORPHOUS ALLOY WITH CHEMICAL REACTION AT ITS SURFACE UNDER HIGH PRESSURE
Authors: YAO BIN  , WANG AI-MIN  , LI HONG  , DING BING-ZHE  , SUI GUI-LING  , HU ZHUANG-QI  ,   (1)四平师范学院物理系,四平136000; (2)四平师范学院物理系,四平136000;中国科学院金属研究所快速凝固非平衡合金国家重点实验室,沈阳110015; (3)中国科学院金属研究所,快速凝固非平衡合金国家重点实验室,沈阳110015; (4)中国科学院金属研究所快速凝固非平衡合金国家重点实验室,沈阳110015
Published: November 2020

Study on the crystallization process of amorphous (Fe0.99,Mo0.01)78Si9B13(FMSB) alloy with and without solid state reaction at their surfaces were carried out under pressures from 3 to 5 GPa at a temperature range of 510 to 660℃ . When the amorphous FMSB alloy with the reaction was annealed at the temperature range, it is transformed into nanocrystalline α - Fe( Al) at 4 GPa and α - Fe (Mo, Si), (Fe, Mo)3B or Fe2B at other pressures, which were as same as the crystallization products of the amorphous alloy without the reaction at the same pressures. The crystallization mechanism of the amorphous alloy with the reaction was suggested on the basis of therrnodynamic theory and a simple solid model.
NUCLEATION AND GROWTH PROCESS OF TEXTURED DIAMOND FILMS
Authors: ZHANG WEN-JUN  , HAN LI  , HU BO  , ZHANG FANG-QING  , CHEN GUANG-HUA  ,   兰州大学物理系
Published: November 2020

Textured diamond films were depsited on (100) Si substrates via microwave plasma CVD (MWCVD) with bias - enhanced nucleation or without substrate bias. The samples were identified by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD) to be textured. The nucleation and growth process of textured diamond films were investigated, the mechanism of nucleation and growth were discussed.
THE POLARIZED RAMAN SPECTRA FOR SINGLE CRYSTAL LiB3O5
Authors: JANG YI-JIAN  , WANG YUE  , ZENG LING-ZHI  , LIU YU-LONG  ,   (1)北京工业大学应用物理系,北京100022; (2)中国科学院物理研究所,北京100080
Published: November 2020

Polarized Raman spectra of all four symmetry species in single crystal LiB3O5 have been measured at room and high temperature. The vibrational modes are classified by the method factor group analysis and the internal vibration bands are tentatinely assigned to vibrations of BO3 triangle and BO4 tetrahedron. Based upon the experimental results of LO-TO splitting , the effective charges of polar modes and the static dielectric constants are calculated.
QUANTUM INVARIANT THEORY AND THE MOTION OF AN ION IN A COMBINED TRAP
Authors: GAO XIAO-CHUN  , GAO JUN  , FU JIAN  ,   浙江大学物理系,杭州310027
Published: November 2020

The generalized invariant theory is used to study the problem of the diagonalization of the time-evolution operator. It is shown that there is an intimate connection between the diagonalization of the time-evolution operator and the phase factors. As an illustrative example, the quantum motion of an ion in a combined trap is investigated; the classical correspondence of the quantum motion and the stability problem are then discussed.
BEHAVIOUR OF THE FRACTAL CRYSTALLIZATION IN Pd, Ge THIN FILM SYSTEM
Authors: ZHANG SHU-YUAN  , CHEN ZHI-WEN  , TAN SHUN  , ZHU JING-SHENG  , LI FAN-QING  , WU ZI-QIN  ,   (1)中国科学技术大学基础物理中心; (2)中国科学技术大学结构分析开放研究实验室,微结构科学技术高等研究中心
Published: November 2020

The behaviour of the fractal crystallization in Pd, Ge thin film system of various ratios of thickness (or composition) after annealing have been investigated by transmission electron microscopy (TEM). It was difficult for the coevaporated Pd-Ge films to realize the fractal crystallization. The production of the fractal structure in Pd/a-Ge bilayers was easier than that in a-Ge/Pd bilayers. The fractal crystallizations were restrainted because of the formation of the compounds (Pd2Ge and PdGe) in Pd, Ge bilayers. The growting of the fractal struc ture depends on the competition of the two precesses of a-Ge crystallization and compound formation.
EXACT SOLUTIONS OF SCATTERING STATES IN THE WEAKEST BOUND ELECTRON POTENTIAL MODEL
Authors: CHEN CHANG-YUAN  , SHEN HONG-LAN  , SUN GUO-YAO  ,   (1)盐城师范专科学校物理系; (2)中山大学物理系
Published: November 2020

Characteristics of the scattering states in the most weakly bound electron potential model have been studied, and certain analytical solutions of a distorted Coulomb wave were obtained. The normalized wave functions of scattering states on the k /2π scale and the calculation formula of phase shift are presented. Analytical properties of the scattering amplitude are discussed, and analytical formulas for calculating bound continuous transition matrix elements are also given. The results may be useful in a wide class of scattering problems.
MAKING LOCAL MODE VIBRATION LONG LIVED BY THE INTERACTION BETWEEN A STRONG MULTI-COLOR LASER FIELD AND MOLECULES
Authors: CHENG JI-XIN  , SHI QIANG  , SHUANG FENG  , ZHU QING-SHI  ,   中国科学技术大学化学物理系
Published: November 2020

Trapping vibrational energy into one single bond is a key problem of bond-selective chemistry. We explored this possibility by means of restricting local mode wavepacket dephasing with multi-color laser field. The vibrational excitation and evolution of molecules in weak and strong multi-color laser fields are discussed by field-quantization method and semi-classical method. The results demonstrate that population can not be trapped in a local mode wave-packet using multi-color weak field, while it is possible to trap vibrational population between the ground state and local mode vibration by making use of power-broadening induced by strong laser field and the interference between two wave-packets excited by two strong laser of different frequencies.
THE SINGLE AND DOUBLE FREQUENCY MULTIPHOTON SPECTRUM OF IODINE
Authors: ZHANG LIAN-SHUI  , LI YUN-JING  , LI XIAO-WEI  , FU GUANG-SHENG  ,   河北大学物理系
Published: November 2020

Using both optical-optical doubl resonance multiphoton ionization spectroscopy (OODR-MPI) and fluorescence excitation spectroscopy techniques,we have measured and assigned the single and double frequecy five-photon ionization spectrum as well as three-photon fluorescence excitation spectrum of iodine molecule,and identified a regular progression with a spacing of 72cm-1 as the excitation of the high vibrational level in the F0+u state. Based on the experimental results,we discussed the channel of excitation,emission and ionization of- iodine- molecule.
THERMODYNAMICAL BEHAVIOR OF 57Fe IMPLANTED IN ZrO2(Y) BY CEMS AND SLOW POSITRON BEAM
Authors: YU FANG-HUA  , ZHANG GUI LIN  , YU SHI JUN  , WENG HUI-MIN  , ZHANG HANG-HUA  ,   (1)上海大学材料学院; (2)中国科学技术大学近代物理系; (3)中国科学院上海原子核研究所,中国科学院核分析技术开放实验室
Published: November 2020

By using conversion electron M?ssbauer spectroscopy (CEMS) and slow positron beam Doppler broading spectrum,the behaviour of the 57Fe implanted (100keV,3×1016 at./cm2) ZYx contained Y2O3 has been studied.The states of Fe0,Fe2+ and Fe3+ ions were obtained from CEMS for as implanted samples.After annealing at 500℃,metallic iron particles α-Fe, were formed at expense of other components. From the S-E curve of the 57Fe as implanted sample,it was found that a large amount of cationic vacancies were distributed in a region of 0—50nm in ZY3.These vacancies disappeared largely after annealing at 500℃.Therefore the parameter S provided an evidence to identify the iron sites in the implanted sample.The ZY3 appeared mingle conducting property at 300℃.It probably correlates with different iron charge states,especially with that of Fe0.
SPACE-RESOLVED STUDY OF NEON-LIKETITANIUM SOFT X-RAY LASING
Authors: LI YU-TONG  , ZHANG QI-REN  , GU YU-QIU  , YANG SHANG-JIN  , YIU YONG-LU  , JI KANG-NING  , ZHAO YONG-KUAN  ,   西南核物理与化学研究所
Published: November 2020

We report a spatially resolved investigation of lasing on the J=0—1,3p—3s transition in neon-like titanium at 32.6nm, with high-resolution erect field spectrometer. Experiments were carried out on the “Xingguang” Nd-glass laser with 1% prepules 5ns before the main pulse. The experimental results are compared with the theoretical simulations obtained by LASNEX and XRASER code. The dependence of lasing region on drive energy is also discussed.
SECOND HARMONIC GENERATION FROM UNPOLED HEMICYANINE-DOPED SILICA THIN FILM
Authors: YU JING  , LIU LI-YING  , XU LEI  , WANG WEN-CHENG  , LI FU-MING  ,   复旦大学物理系三束材料改性国家重点实验室
Published: November 2020

Hemicyanine-doped silica film was fabricated by the sol-gel technique.It was demonstrated for the first time that the self-alignment of hemicyanine molecules in the above film existed in the interfacial area.A χ（2） value of 6.6pm/V was obtained for a 50nm thick film.
PREPARATION OF nc-Ge EMBEDDED IN SiO2 MATRIX AND OBSERVATION OF VISIBLE PHOTOLUMINESCENCE
Authors: HE ZHEN-HONG  , CHEN KUN-JI  , FENG DUAN  ,   南京大学物理系固体微结构物理国家重点实验室
Published: November 2020

The nanocrystalline(nc) Ge embedded in SiO2 matrix was attempted to synthesize from thermal oxidation of PECVD deposited ａ-GexSi1-x∶H films.The microstructures of the samples were detected by Fourier transform infrared spectroscopy,Raman spectroscopy and XRD.The results reveal that Ge nanocrystals form during oxidation and their numbers and sizes are varied with different Ge content in the as deposited ａ-GexSi1-x∶H alloy and also changed upon different-oxidation conditions.These characteristics may be due to the selective oxidation of Si in ａ-GexSi1-x∶H alloy and the reduction of hydrogen existing in the samples in view of chemical thermodynamic equilibrium. Some nc-Si samples display visible photoluminescence(PL) at room temperature.Based on Brus, exiton three-dimensional quantum confinement model,the nc-Ge size was evaluated from the PL peak positions and show a good agreement with the result of XRD.All the above analyses suggest that nc-Ge buried in SiO2 matrix can be obtained by the present method and its visible photoluminescence is related to the effect of quantum size on nc-Ge.The observation of nc-Ge with TEM is required to further confirm these facts.
CHARACTERIZATION OF Hg1-xCdxTe EPITAXIAL FILMS ON VARIOUS VICINAL PLANES
Authors: LI BIAO  , CHU JUN-HAO  , ZHU JI-QIAN  , CHEN XIN-QIANG  , CAO JU-YING  , TANG DING-YUAN  ,   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 Hg1-xCdxTe films were prepared by a dipping liquid phase epitaxy technique on spherical CdTe substrate with several different misoriented facets. They were characterized by means of micrograph,infrared absorption spectra, Raman scattering, and X ray double crystal diffraction. The results show that-near facet (δ<1°) and terrace free (δ≈1.2 °) growth modes are superior in both the planarity and the amount of precipitates.
ELEMENTARY EXCITATIONS OF ONE-DIMENSIONALQUANTUM SINE-GORDON MODEL
Authors: CHEN YU-GUANG  , YUAN QING-SHAN  , CHEN HONG  , ZHANG YU-MEI  , WU XIANG  ,   同济大学波耳固体物理研究所
Published: November 2020

Using the-self-consistent quantum perturbation theory, we study the elementary excitaton of one-dimensional sine-Gordon model described by parameters α0 and β0. It is demonstrated in this article that the elementary excitations consist of quantum solitons and antisolitons.Under the condition α020≤8π,our results for the gaps agree with the exact results of the Thirring model and the half-filling Hubbard model based on the bosonization techniques.
CALCULATION OF THE ENERGY EIGENVALUE OF A-QUANTUM SYSTEM IN THE FRAMEWORK OF-SUPERSYMMETRY AND SHAPE INVARIANCE
Authors: JIA CHUN-SHENG  , JIANG XIAO-WEI  , WANG XIAO-GUO  , YANG QIU-BO  ,   (1)西南交通大学桥梁和地下工程系; (2)西南石油学院基础学科部; (3)中国人民武装警察学院基础学科部
Published: November 2020

We present the energy eigenvalues of modified Pschl-Teller potential,the N-dimensionalhydrogen atom,and the N-dimensional harmonic oscillator.The calculations are carried out in the framework of supersymmetry and shape invariance.The present energy spectrum formulas are consistent with the exact solutions obtained with the usual factorization method.
TWO KINDS OF ELECTROLUMINESCENCE FROM POROUSSILICON IN ELECTROLYTE SOLUTIONS
Authors: LIAO LIANG-SHENG  , YUAN ZE-LIANG  , LIU XIAO-BING  , HOU XIAO-YUAN  ,   (1)长沙电力学院物理系; (2)复旦大学应用表面物理国家重点实验室;李政道物理学综合实验室
Published: November 2020

Two kinds of different electroluminescence from the porous silicon grown on p-type silicon wafers were observed by applying a forward bias to porous silicon in acidic aqueous system containing strong oxidizing agents (such as 1mol·L-1HCl, 1mol·L-1 SnCl4, and 1mol·L-1 H2SO4+0.1mol·L-1 Na2S2O8). One was the red emission with low applied voltage (V+≈1.4V). Its red peak shifted to shorter wavelength as the operation time increases. It is most possibly related to the quantum size effect. The other was the white emission exhibited after the red one was quenched and when high voltage was applied on (V+>30V). It is resulted from the hot electron injection under high electric field to the thin and continuos SiO2 sub-layer formed in the porous silicon after the red emission was quenched in the electrolyte.
THE SOLITARY WAVE SOLUTIONS FOR A CLASS OF NONLINEAR WAVE EQUATIONS
Authors: FAN EN-GUI  , ZHANG HONG-QING  ,   大连理工大学数学科学研究所
Published: November 2020

Some solitary wave solutions for a class of nonlinear wave equations utt－a1uxx＋a2ut＋a3u+a4u3=0 are obtained by homogeneous balance method and Wu-eliminition method. Many well-known equations in physics such as φ4 equation, Klein-Gordon equation, Duffing equation and telegraph equation are special cases of the wave equation presented in this paper.
STATE SPACE RECONSTRUCTION AT POOR SIGNAL TO NOISE RATIO
Authors: YUAN JIAN  , XIAO XIAN-CI  ,   电子科技大学电子工程系
Published: November 2020

For state space reconstruction of the chaotic signals overwhelmed in the noise,based on dynamical systems theory and current methods of reconstruction, we propose a new reconstruction method by using the subset of principal components with the largest variance. We also discuss the reconstruction window. The new approach is verified by analyzing the singular spectra and the phase portraits of the Lorenz′s signal superposed with white noise.
EMISSION TIME SCALE AND EMISSION MECHANISM OF INTERMEDIATE MASS FRAGMENTS FOR 40Ar+159Tb REACTION AT 30MeV/NUCLEON
Authors: HE ZHI-YONG  , LI ZU-YU  , DUAN LI-MIN  , DAI GUANG-XI  , ZHANG BAO-GUO  , FU YAN-BIAO  , WANG HONG-WEI  , JIN GEN-MING  ,   中国科学院近代物理研究所
Published: November 2020

Fragment-fragment correlation functions have been measured for 40Ar+159Tb collisions at E/A=30MeV.Emission time of intermediate mass fragments has been extracted from correlation functions using the three-body trajectory model.The average emission time varies with the energy of fragments.It decreases from about 500fm/c for low energy fragments to about 100fm/c for energetic fragments.The emission time also decreases with increasing beam energy,which implies the emission mechanism of fragments translates from sequential binary decay to multifragmentation disassembly.The transitional beam energies are about 35—45MeV/nucleon for 40Ar+159Tb collisions.
ENHANCED INDEX OF REFRACTION IN AN UNDRIVEN SYSTEM
Authors: HU XIANG-MING  , PENG JIN-SHENG  ,   (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 we show that nondegenerate Λ three-level medium without external coherent driving can produce a large index of refraction at a point of vanishing absorption via the atomic coherence which is induced by the probe field itself.
SINGLE-PHASE CRYSTALLIZATION IN AMORPHOUS Fe78Si9B13 ALLOY INDUCED BY ELECTROPULSING
Authors: CHAO YUE-SHENG  , TENG GONG-QING  , GENG YAN  , LIU XIAO-WU  , LAI ZU-HAN  ,   东北大学理学院
Published: November 2020

Amorphous specimens of Fe78Si9B13 have been treated by ultrashort pulse current. It was obtained that the α-Fe(Si) single-phase structure precipitated from the amorphous matrix of Fe78Si9B13 by adjusting the parameters of pulse current. It can be considered that the single-phase crystallization results from the periodic repulsion between the moving electrons and the vacancy-like structural defects in the amorphous parts.That is,the repulsive effect causes the metalloid atoms B to precipitate from the amorphous structural units and Fe(Si) atoms segregate in some localized region. So the basic metal phase is forced to nucleate at a lower temperature. However the directional migration of vacancy-like defects will be accompanied by diffusion of atoms B. Obviously,the segregation of atoms B and the precipitation of Fe-B compound will be checked by both factors the mentioned above.
GIANT MAGNETORESISTANCE EFFECT OF THE La1-xCaxMnO3 SYSTEM
Authors: RUAN YONG-HONG  , WANG JING-SONG  , XU ZHU-AN  , JIAO ZHENG-KUAN  , ZHANG QI-RUI  ,   浙江大学物理系
Published: November 2020

The electrical resistivity ( ρ ) and magnetoresistance of polycrystalline pellets of La1-xCaxMnO3 were measured in the 10—300K range in magnetic fields up to 1.8T. It was found that when x increases, both the peak of the electrical resistivity and the peak of magnetoresistance occurs at lower temperatures.The authors suggested that the change of x results in the change of proportion of Mn4+ ions.Variation of the proportion of Mn4+ ions leads to the change of magnetic structure of La1-xCaxMnO3.Zener's model of double exchange coupling can be used to explain the experimental results.
NONLINEAR TE SURFACE WAVES ON AN ANTI FERROMAGNET
Authors: WANG QI  , WANG YOU-FA  , BAO JIA-SHA  ,   上海大学物理系
Published: November 2020

The nonlinear characteristics of TE surface wave on an anti-ferromagnet is studied.The nonlinear motion equation for TE wave is converted to Bernoulli differential equation and its exact solution is found in a form of inverse function.The necessary condition for the existence of nonlinear TE surface wave is μx>0.The dispersion equation and the frequency region are analyzed.The theoretical results show that the peak position of the magnetic field is not a function-of power and localized steadily at the surface of the material.In the condition of-- ε1>ε2 one guiding power corresponds two different effective refraction indexes showing the bistable property of the nonlinear TE surface waves.
PHOTOIONIZATION OF (CH3I)n(n=1,2,3,4) USING SYNCHROTRON RADIATION
Authors: RAN QIN  , SHU JI-NIAN  , PEI LIN-SEN  , CHEN CONG-XIANG  , YU SHU-QIN  , MA XING-XIAO  , WU GUO-HUA  , SHENG LIU-SI  , ZHANG YUN-WU  ,   (1)中国科学技术大学国家同步辐射实验室; (2)中国科学技术大学化学物理系
Published: November 2020

Combing the techniques of supersonic molecular beam and vacuum ultraviolet synchrotron radiation photoionization time-of-flight mass spectroscopy,we have measured the photoionization efficiency(PIE)curves of ions from (CH3I)n(n=1,2,3,4)cluster molecules and obtained the adiabatic ionization potentials of (CH3I)n+(n =1,2,3,4) and appearance potentials of the fragment ions.From these data,bond energies D0 of the related molecules or molecule ions have been evaluated.Several autoionization structures of CH3I in the PIE curve of CH3I+ have been observed and 4 Rydberg series,ns,npσ, npπ and nd, converging to CH3I+(2Ｅ1/2),are identified.
MIRRORLESS OPTICAL BISTABILITY DUE TO PHOTOINDUCED EXCITON BLEACHING OF POLYMERS
Authors: WANG HUI  , LAN WEN-GUANG  , LIN WEI-ZHU  , MO DANG  ,   中山大学物理系
Published: November 2020

Based on the established theory of photoinduced exciton bleaching of the polymers with nondegenerated ground state,we calculated the transient mirrorless optical bistability of photoexcitation and relaxation processes in the polymers.The results show that the transient saturation absorption mirrorless optical bistabilities and the increasing absorption mirrorless optical bistabilities can be obtained from the ultrafast excitation and relaxation processes in the polymers with nondegenerate ground state,and the switching time of the optical bistabilities is of the order of fs or ps.With the increase of the delay time of the probe pulse relative to pump pulse,the nature of mirrorless optical bistability can change from the saturation absorption optical bistability to increasing absorption optical bistability,and the rate of change is proportional to the speed of relaxation of the photoinduced exciton.
THE EFFECT OF RADIATION TO THE HELICAL INSTABILITY OF ARCS IN AN AXIAL-MAGNETIC FIELD
Authors: ZHANG PENG-YUN  , GONG YE  , LI GUO-BING  ,   大连理工大学物理系
Published: November 2020

The helical instability of an arc column with electrical conductivity of the parabolic distribution and transparent radiation of the parabolic distribution is discussed in axial magnetic field.The magnetohydrodynamic equations serve as the strarting point of the theory.In an electrostatic approximation and a linear time dependent perturbation theory,the perturbation equations for the arc column movement are deduced.Solutions of these equations are obtained analytically,from which the stability limit of the cylindrical arc and the growth rate of the helical instability are given.In comparision the results with those of current distribution without radiation,it is found that the radiation in the small middle arc increases the instability.