bluuebunny/crossref_metadata_2025 huggingface dataset:
THE EFFECTIVE POTENTIAL APPROXIMATION OF ADSORBED 4He FILM IN QUASI TWO DIMENSIONAL MOTION
Authors: GUO ZHI-CHUN  , MIAO SHENG-QING  , YI YOU-MIN  ,   安徽大学物理系
Published: November 2020

By means of the quasi two dimensional motion picture of adsorbed 4He monolayer or second layer, an effective pair potential of helium atoms has been derived. The second virial coefficients and its second derivatives calculated from this effective potential agree with the experimental data much better than that calculated from the ideal 2-dimension model.
THE TRANSFORMATION OF CONSTRAINED SYSTEM AND GENERALIZED KILLING'S EQUATIONS
Authors: LI ZI-PING  ,   新疆大学物理系
Published: November 2020

Starting from the transformation properties of constrained system which is a general transformation results of action and constrained equations, we obtain generalized killing's equations of constrained system. The transformation generated by the solution of generalized killing's equations, may yield classical Noether's conservation quantities. We have considered the time-space and internal transformation of continuous constrained system which leave constrained equations invariant and give a necessary and sufficient condition that transformations may yield conservation current. The application to incompressible continuous media are presented. The application to generalized and classical mechanics are discussed and some illustrations for the solution of generalized killing's equations are also given. The Poincare's invariant is generalized to constrained generalized mechanical system.
TEM INVESTIGATION OF OXYGEN PRECIPITATES AND INDUCED DEFECTS IN ANNEALED CZ-Si SINGLE CRYSTAL
Authors: GAO YU-ZUN  ,   北京有色金属研究总院
Published: November 2020

In this paper, oxygen precipitates and induced defects in annealed dislocation-free CZ-Si with high oxygen content have been investigated by HVEM. The oxygen precipitates are spherical crystobalite at 750-1050℃. In addition to spherical precipitates, there are some square plate-like oxygen precipitates with {001} habit plane. Punching prismatic dislocation loops are emitted from oxygen precipitates along 〈110〉 directions above 950℃.The loops are interstitial loops with Burgers vector α/2〈110〉 and axis 〈110〉.The loops are generated by a square plate-like precipitate or by a cluster of spherical precipitates. When dislocation loop encounters obstacle, the complex dislocation configuration may be produced. A stage in a stacking fault has been observed, it is formed by climb of the stacking fault. If treatment temperature is below 850℃, no bulk stacking fault results.
NONLINEAR BEHAVIOR OF TEARING MODES NEAR THRESHOLD
Authors: GUO SHI-CHONG  , CAI SHI-DONG  ,   中国科学院物理研究所
Published: November 2020

The nonlinear evolution equation of the resistive m≥2 tearing modes near their linear thresholds is derived as ?-Q2A+K/2A2à-Q2(δ△1e)/(△1e)A3=0 where the quasilinear approximation has been used; A is the mode amplitude; Q and K are the dimensionless linear growth rate and wave vector; △e and δ△1e are the linear and nonlinear discontinuities of the logarithmic derivatives. The nonlinear time evolutions of the modes are discussed in detail. No bifurcation solution exists for a symmetrical sheet pinch model.
THEORY OF LUMINESCENCE AND EFFECT OF CONCENTRA-TION IN PrxLa1-xP5O14 CRYSTALS
Authors: ZHANG SI-YUAN  , WANG QING-YUAN  , WU SHI-XUE  , BAI YUN-QI  ,   中国科学院长春应用化学研究所
Published: November 2020

By using the Judd-Ofelt theory, the Q2 parameters of the oscillator strength, were obtained in PrP5O14 crystals. The calculated oscillator strengths were compared with the experimental data. The radiative transition probabilities of electric dipole and magnetic dipole from 3P1,3P0,1D2 and 1G4 energy levels and the multipolar coupling transfer probabilities be tween the 1D2- 1G4 and 3H4- 3F4 energy level pairs were calculated. The concentration effect of 1D2 emission intensities and the diagrams which show the dependence of intensities on concentrations and the excited light were also given.
IN-DEPTH OXYGEN CONTAMINATION PRODUCED IN CW CO2 LASER ANNEALED Si
Authors: XU ZHEN-JIA  , CHEN WEI-DE  ,   中国科学院半导体研究所
Published: November 2020

Siwafers annealed by CW-CO2 laser have been studied using Nomarski technique, electron absorption image, IR spectrum, AES and ESCA, with particular emphasis on the study of in-depth oxygen contamination. Electron absorption image shows that the effect of CW-CO2 laser annealing is not very uniform in our case. And it has also shown that CW-CO2 laser annealing in air would decrease the carbon contamination on the Si surface, but produce oxygen contamination. This oxygen contamination consists of two parts: SiOx on the surface and free oxygen atom underneath, its thickness is less than～250?.
CRYSTALLIZATION OF AMORPHOUS Ti80Si20 ALLOY UNDER HIGH PRESSURE
Authors: WANG WEN-KUI  ,   中国科学院物理研究所
Published: November 2020

We find that the amorphous alloy Ti80Si20 wouldn't decompose into multiphases, but rather transform directly into bcc supersaturate solid solution of Ti (Si). This phenomena may be attributed to the lower elastic energy created by solid solution and the comparatively large compressibility of Ti.
STUDY OF HYDROGEN-INDUCED DEFECTS IN FLOATING ZONE SILICON GROWN IN HYDROGEN ATMOSPHERE
Authors: MAI ZHEN-HONG  , CUI SHU-FAN  , LIN JIAN  , Lü YAN  ,   (1)天津大学,一九八三年毕业生; (2)中国科学技术大学,一九八三年毕业生; (3)中国科学院物理研究所
Published: November 2020

The relationship between the annealing temperatures and the hydrogen-induced defects in floating zone silicon grown in hydrogen atmosphere has been investigated by X-ray section topography. According to the analysis of X-ray topographic patterns of the early stage hydrogen-induced defects, it is found that the lattices around hydrogen precipitates are under compression. The processes of the breakdown of silicon-hydrogen bonds and the formation of hydrogen-induced defects are discussed briefly.
THE RELATIONS BETWEEN VOLTAGE AND MAGNETIC FIELD OF SUPERCONDUCTING WEAKLINK(Ⅰ)
Authors: ZHANG YU-HENG  , WANG JUN  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学物理系,82级研究生
Published: November 2020

The quantum diffraction of the superconducting weaklink and the quantum interference of the dc-SQUID have been calculated theoretically based on the constant current source ESJ modle. An analytical expression describing the constant amplitude oscillation of the dc voltoge component with magnetic field for double junction de-SQUID has been obtained.
THEORY OF THE CRITICAL TEMPERATURE FOR SUPERCONDUCTORS WITH SMALL λ (Ⅰ)
Authors: WU HANG-SHENG  , WENG ZHEN-YU  ,   中国科学技术大学物理系
Published: November 2020

A formula of the critical temperature for superconductors with small λ is derived from the Eliashberg equation. The effective phonon spectrum is taken in the present paper as the Einstein spectrum. The values of Tc calculated from our formula are compared with the numerical solutions of the Eliashberg equation in the case of μ*= 0 and the agreement between them is fairly well in the region of λ<Λ.
CALCULATION OF THE ELECTRON-PHONON COUPLING S FACTOR INDUCED BY RARE-EARTH IMPURITIES IN CRYSTALS
Authors: GU ZONG-QUAN  , WANG YONG-LIAN  ,   中国科学院半导体研究所
Published: November 2020

A formula is given for calculating minimum electron-phonon coupling S factor in mul-tiphonon transitions, this formula has the advantage of being independent of lattice vibration modes. The S factors have been evaluated for the multiphonon transitions among the multiplets 5F1,5F4,5F5,5G4,5G5 of Ho3+ ion in the LaF3 crystal. The values obtained for the S factor are around 0.05, which is in agreement with experimental results.
THE GENERALIZED MEAN FIELD EXPANSIONS FOR MANY FERMION SYSTEMS
Authors: SU ZHAO-BING  , YU LU  , ZHOU GUANG-ZHAO  ,   中国科学院理论物理研究所
Published: November 2020

The set of coupled, self-consistent equations for the order parameter, the fermion field and the collective excitations developed previously in the framework of the closed time-path Green's functions (CTPGF) is applied to systems with four-fermion interaction. The Hartree, the Hartree-Pock (HP) and the random phase approximations (RPA) for the order parameter and its fluctuations are derived in a systematic way. The thermodynamical potential for the fermion system is calculated explicitly in these approximations. The formalism presented here can be applied to nuclear as well as other many fermion systems in both equilibrium and nonequilibrium states.
ON THE LINE BROADENING AND SHIFTS OF Al-LASER PRODUCED PLASMA
Authors: SHE YONG-BO  , CHEN YUN-FANG  , ZHAO RU-WEN  , ZHANG XIU-LAN  , PAN GUANG-YAN  ,   中国科学院物理研究所
Published: November 2020

We have studied the spatially resolved spectra of Allaser produced plasma. In the range from 2300-4000 ? about thirty emission lines have been observed belonging to the neutral, singly and doubly ionized Al species. Their line widths and shifts vary with the distance between the plasma and the Al-target surface. Five lines from differently ionized species have been examined with the aid of the theoretical formula given by Griem, and the distribution of electron density near the target has been determined semi-empirically. We found that the line broadening of the different species coincided well with each other, and could be used as a measure of electron density in the range from 1·1017 to 5·1018cm-3. But the coincidence between the line shifts seems not so good, especially for the lines of 3587 ? of Al II and 3610 ? of Al III. It remains to be further investigated.
TEMPERATURE DEPENDENCE OF THE MAGNETIZATION AND ELECTRICAL RESISTIVITY FOR AMORPHOUS Fe87-xSixB13 ALLOYS
Authors: SHEN BAO-GEN  , ZHAN WEN-SHAN  , ZHAO JIAN-GAO  , CHEN JIN-CHANG  ,   (1)冶金工业部钢铁研究总院; (2)中国科学院物理研究所
Published: November 2020

The magnetization and eleetrcal resistivity as a function of temperature for amorphous Fe87-xSixB13 (x=0, 9.6, 14.5) alloys were studied. It is obtained that Curie temperature Tc and crystalline temperature Tcr increases markly with increasing Si content. The temperature dependence of magnetization at low temperature is in accordance with Bloch T3/2 law. Calculation shows that the spin wave stiffness constant D increases with increasing Si content from 62meV·A2 to 111 meV·A2 δ=〈△J〉1/2/〈J〉 value obtained from D is close to that calculated by Handrich theory. The resistivity minima phenomena have been observed at low temperature for x=0, 9.6 and 14.5. The temperature of resistivity minima Tmin increases with increasing Si content from 10.5K for x=0 to 24.6 K for x=14.5. The temperature dependence of the resistivity are linear and quadratic near room temperature and in the range Tmin≤T≤130K, respectively. A discussion of this phenomenon is given in terms of a generalized Ziman theory.
SPECTROSCOPIC OBSERVATIONS ON THE LINE STARK BROADENING IN THE VACUUM ULTRAVIOLET IN LASER-PRODUCED PLASMAS
Authors: WANG YONG-CHANG  , E. JANNITTI  , G. TONDELLO  ,   (1)西北师范学院物理系; (2)意大利国家研究院电离气体研究所; (3)意大利帕多瓦大学电子学和电子工程学研究所
Published: November 2020

The emission from dense plasmas produced by a Q switched ruby laser pulse focusing on plane targets of the elements Be, C and N has been observed in the vacuum ultraviolet at various distances from target surface. For recording the emission spectra an intensified photodiode array and an optical multichannel analyzer have been implemented. Very broad lines of the type △n=l of the H-like He-like and Li-like ions arising from relatively high principal quantun number n appear prominent in the spectra. And according to the ion quasistatic approximation theory the electron densities of the plasmas as the function of the distances from the target surface have been derived.
LOW ANGLE GRAIN BOUNDARIES IN HCP METAL α-Ti
Authors: LI  ZONG-QUAN  , ZHANG LI-DE  , HE YI-ZHEN  ,   中国科学院固体物理研究所
Published: November 2020

This paper presents the results about the low angle grain boundaries observed in HCP metal α-Ti by TEM. Not only the tilt boundaries but also the twist boundaries formed on basal plane and prism plane have been observed. In the dislocation network lain on prism plane, type c dislocations have been observed but their movement has never been disclosed. This may be related to the high Peierls stress of type c dislocations.
HYDROSTATIC PRESSURE DEPENDENCE OF GOLD ACCEPTOR LEVELS IN Si
Authors: LI MING-FU  , CHEN JIAN-XIN  , YAO YU-SHU  , BAI GUANG  ,   (1)北京工业大学无线电系; (2)中国科学技术大学研究生院; (3)中国科学院物理研究所
Published: November 2020

The hydrostatic pressure coefficient of gold acceptor levels Er in Silicon was measured by transient capacitance method. Under the pressure range of 0-8 Kbar, thepressure coefficient (?(Ec-ET))/(?P) =-1.9 meV/kbar. The electron capture cross section of gold acceptor centers does not depend on pressure within the experimental accuracy. By comparing the present result of hydrostatic pressure coefficient with the uniaxial pressure coefficient reported in [13], we conclude that the defect potential is lack of Td symmetry. Therefore, the gold acceptor levels are not originated by simple gold substitutional or interstitial configuration in Si crystals.
THE CASIMIR EFFECT IN A GAUGE COVARIANT FIELD THEORY
Authors: XUE SHE-SHENG  , XIAN DING-CHANG  ,   中国科学院高能物理研究所
Published: November 2020

The contribution of the ghost particle to the vacuum energy (Casimir energy) and the influence of various covariant gauges on the vacuum energy are calculated in the U(l) gauge field theory by using the Peynman path integral method.
SHIFT OF FREQUENCIES OF Si—H INFRARED ABSORPTION SPECTRA IN SOLID STATE SILICON
Authors: CUI SHU-FAN  , MAI ZHEN-HONG  , CHU XI  ,   中国科学院物理研究所
Published: November 2020

The shift of frequencies of Si—H infrared absorption spectra in solid state silicon in comprarison with those in gaseous subsilane was interpreted. The results showed that SiHx groups similar to subsilane molecule exist in solid state silicon.
XPS STUDY OF THE OXIDES ON THE SURFACE OF NbN THIN FILM
Authors: WANG XIE-WEN  , WU SI-CHENG  ,   北京大学物理系
Published: November 2020

The composition of the oxides formed at room temperature in the atmosphere or by rf oxidation on the surfaces of NbN thin films were characterized by means of X-ray photoelectron spectroscopy. The experimental Nb3d spectra show that the interfacial phase formed between NbN substrate and the niobium pentoxide is different from the case of pure niobium. It is Nb2O3 but not a mixture of NbO and NbO2. The surface of NbN seems to have the ability of protecting itself from the formation of conducting suboxides such as Nb2O, NbO etc. This is useful for improving the quality of the superconducting tunnel junction with oxide barrier.
DYNAMICAL BEHAVIOR OF RF-BIASED JOSEPHSON JUNCTIONS (Ⅱ)
Authors: WANG ZI-DAN  , YAO XI-XIAN  ,   南京大学物理系
Published: November 2020

Numerical investigations of a differential equation describing a rf-biased Josephson junction, in which the interference term current is included, are carried out in some parameter region. The existanee of the intermittant transition to chaos is obtained and the critical exponent of the scaling law is determined in agreement with theoretical predictions. Furthermore, the Lyapunov exponent is calculated for several parameters, then the fractal dimension of strange attraetor dL is obtained, its dependence on the Lyapunov exponent is defined by Kaplan and Yorke. In addition, the Kolmogorov capacity of strange attractor dc is also calculated by box-counting algorithm. Such calculated values of dL and dc are close to each other as expected.
A STUDY OF RAMAN SPECTRA OF GLASSES IN THE Li2O-B2O3-SiO2 SYSTEM
Authors: JIN YI-FEN  , JI YUN-SONG  , CHEN XIANG-SHENG  , HUO GENG-QUAN  , HUANG XI-HUAI  ,   中国科学院上海硅酸盐研究所
Published: November 2020

In the Li2O-B2O3-SiO2 glasses with Li2O≥30 mol%, substitution of Li2O for B2O3 or SiO2 leads to increase the amount of borate and silicate groups with non-bridging oxygen in glass network; while substitution of B2O3 for SiO2 leads to increase the amount of borate groups with or without non-bridging oxygen and silicate groups with non-bridging oxygen.
A M?SSBAUER STUDY OF γ-Fe2O3 MAGNETIC POWDER WITH Co-DOPING
Authors: XIA YUAN-FU  , LIU RONG-CHUAN  , WANG SHU-XIN  , XIA CHENG-ZHONG  , SHEN DE-FANG  ,   (1)南京大学物理系; (2)中国科学院上海冶金研究所
Published: November 2020

The γ-Fe2O3 magnetic powder samples with Co-doping prepared by different technological process and some other magnetic powder products were studied by means of M?ssbauer effect of 57Fe, magnetism measurements and chemical analysis. The experimental results indicate that the changes of coercivity are related to microstructure, this is shown in the M?ssbauer spectra.
AN EXPRESSION FOR THE CRITICAL TEMPERATURE Tc OF L12 TYPE SUPERCONDUCTORS
Authors: WANG RONG-YAO  , LUO QI-GUANG  , ZHANG XIAO  ,   (1)清华大学物理系; (2)中国科学院物理研究所
Published: November 2020

Through the examination of L12 type superconductors, we obtained the expression for the superconducting critical temperature Tc of L12 type superconductors: Tc=(15.9TBV(B)GA)/(M1/2 V(L12)GB) where TB is the superconducting critical temperature of pure B, V(B) is the atomie volume of pure B, V (L12) is the average atomic volume of the L12 type compound, M is the average atomic wight of the compound, and GA ,GB are Gordy electronegative values.
MEASUREMENTS OF ULTRASONIC HARMONICS IN MOLECULAR CRYSTAL NAPHTHALENE
Authors: WANG YAO-JUN  ,   南京大学声学研究所
Published: November 2020

Measurements of the variation of ultrasonic second harmonic wave amplitudes with the specimen temperatures and the fundamental wave amplitudes are made in molecular crystal naphthalene by using a modified pulse echo technique. Explanation of the experimental results is given and problems for further investigation are suggested.
TEMPORAL BEHAVIOR OF QUASI-STATIONARY STIMULATED RAMAN SCATTERING
Authors: MENG SHAO-XIAN  , ZHANG WEI-QING  , LIN LI-HUANG  , LIN ZUN-QING  , SHENG GUO-PING  , XIE ZI-MING  , KANG YU-YING  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The ethanol media is pumped by a 5321? single laser pulse of 200 ps duration. The backward Stokes pulse of 14 ps duration and the forward Stokes pulse of 26 ps duration are obtained simultaneously. Theoretieal discussion is also given in this paper.
CONDUCTION CHARACTERISTICS OF Na-β(β")-Al2O3 CONTAINING FINE CARBON PARTICLES
Authors: XUE RONG-JIAN  , CHEN LI-QUAN  ,   中国科学院物理研究所
Published: November 2020

The conduction charateristics of Na-β(β″)-Al2O3 containing (1-10wt%) fine carbon particles have been investigated. The study shows that the samples containing less than 6 wt% of carbon are still fast ionic conductors and their conductivity is one to two orders of magnitude higher than that of pure Na-β(β″)-Al2O3. The electrical parameters of the samples, such as the bulk resistance, grain boundary resistance, double layer capacitance and leakage current resistance vary with content of carbon. These influences of carbon have been discussed here in some detail. The measurement of conductivity in temperature range from -40℃ to 80℃ shows that Na-β(β″)-Al2O3 containing less than 6 wt% of carbon are good materials for making double layer capacitor.
INVESTIGATION OF M-, W-, X-TYPE HEXAGONAL BARIUM FERRITES M?SSBAUER SPECTRA
Authors: LIU PENG-XIA  , JIAO HONG-ZHEN  , ZHANG YU-CHANG  , LU HUAI-XIAN  , DU YOU-WEI  , WANG TING-XIANG  ,   (1)河北师范大学物理系; (2)南京大学固体物理研究所; (3)南京大学物理系
Published: November 2020

The M?ssbauer spectra for the M-, W- and X-type hexagonal barium ferrites were measured. We obtained the M?ssbauer spectra parameters of the M- and W-type ferrites, using the method of trial and error of a number of superposed six-line Lorentzian spectra with experimental spectra. In crystallographic consideration the X-type ferrites may by regarded as a superposition of M- and W-type. Then we obtained eleven six-line sub-spectra of the X-type with good fitting of experimental data.
ELECTRICAL PROPERTIES OF A NEW PYROELECTRIC BARIUM METABORATE CRYSTAL IN LOW TEMPERA-TURE PHASES AND ITS POTENTIAL APPLICA-TION IN INFRARED PYROELECTRIC DETECTOR
Authors: SHI ZI-KANG  , JIANG AI-DONG  , YE HAI-TAO  , CHEN CHUANG-TIAN  ,   中国科学院福建物质结构研究所
Published: November 2020

We investigated systimatically the electrical properties of the barium metaborate crystal in low temperature phases and found a new type of pyroelectric crystal materials, the single crystal samples of which grew in our laboratory. According to experimental investigations on many of its physical propenties, such as the dicalectric constant, de-resistivity, loss angle, pyroelectric coefficient, Cp, as well as transparency, it may be expected that this material would be useful for application in high power infrared pyroelectric detectors.
BASIC STUDY ON SPATIAL FILTER USED IN Nd-GLASS HIGH POWER LASER SYSTEM
Authors: WANG GUI-YING  , ZHAO JIO-YIAN  , ZHANG MING-KE  , FAN DIAN-YIAN  , GUI ZHAI-QUAN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

In this paper, image relaying of the spatial filters on the high power Nd-Glass laser system for improving brightness of laser beam is demonstrated. Detailed theoretical treatment and numerical calculation on selection of filtering pinholes are carried out. Finally, a new idea about the depth of field of spatial filter and several new experimental methods of adjusting spatial filters are suggested.
STIMULATED BRILLOUIN SIDESCATTERING IN LASER-IRRADIATED PLASMAS
Authors: XU ZHI-ZHAN  , LIN KANG-CHUN  , QIAN AI-DI  , ZHANG WEN-QI  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The stimulated Brillouin scattering process under the interaction of high intensity sub-ns pulse laser with plasmas has been investigated, with a larger extent of underde-nse plasma being produced in advance. The occurence of instability of both stimulated Brillouin backscattering and sidescattering can be confirmed simultaneously through careful measurements of the energy and spectrum of the backscattered light, as well as the angular distribution of the sidescattered light, especially its space anisotropy.
A STUDY OF THE ARRIVAL DIRECTION OF COSMIC RAYS WITH AVERAGE ENERGY ABOUT 2×1015 eV
Authors: SUN LUO-RUI  ,   郑州大学物理系
Published: November 2020

From May 1982 to January 1983, more than 17,000 cosmic ray air showers were recorded by the small air shower array in Sydney University. Using X2 test and harmonic analysis to study the arrival direction of the showers, no significant anisotropy has been fond.
ON THE SINGULAR PERTURBATION SOLUTION OF BOLT-ZMANN EQUATION (Ⅲ)——"BOUNDARY LAYER" SOLUTION
Authors: DING E-JIANG  , HUANG ZU-QIA  ,   北京师范大学低能核物理研究所
Published: November 2020

The "boundary layer" solution of Boltzmann equation with a small Knudson number is discussed by using a kind of singular perturbation method, and is reduced to solving a set of linear algebraic equations. The dependence of the temperature jump coefficient on the accommodation coefficient is obtained for the Maxwell's boundary conditions.
ANNIHILATION OF VERTICAL BLOCH LINES IN IN-PLANE FIELD
Authors: LI JING-YUAN  , YU ZHE-HONG  , HAN BAO-SHAN  , ZHANG SHOU-GUNG  ,   中国科学院物理研究所
Published: November 2020

Hard bubbles and hard wall segments will transform into normal ones, if an in-plane field is larger than a threshold value Hin. We measured the Hin values for some as-grown magnetic bubble materials. As d.c, magnetic bias field perpendiculer to the film increases, Hin decreases. It has been shown that the transformation from hard bubbles and hard wall segments into normal ones is a relaxation proccess which may last for a few seconds or more. The above results were explained qualitatively in terms of the concept of field-nucleated Bloch points suggested by Slonczewski and Maloze-moff.
PHOTO-INDUCED DEGRADATION OF UNDOPED AMORPHOUS SILICON HYDRIDE PREPARED BY D. C. GLOW-DISCHARGE DEPOSITION TECHNIQUE
Authors: WU DAO-HUAI  , YE JIAN-MING  , PAN HUI-YING  , CHENG RU-GUANG  ,   (1)中国科学院上海硅酸盐研究所; (2)中国科学院物理研究所
Published: November 2020

Effect of annealing and light illumination on electrical and optical properties of undoped a-Si :H films were studied. The surface energy band bending is created by H20 adsorbats in order to compare the difference between annealing state and light illumination state. The results show that the density of gap state has been increased by light illumination.
THERMAL DESORPTION SPECTRA OF PROPENE AND OXYGEN ADSORBED ON BLUE TUNGSTEN OXIDE
Authors: ZHUANG CHENG-QUN  , FENG YI-QING  , JIN XIAO-FENG  , WANG XUN  , CAI XIAN-E  , YU LIAN-MIN  ,   (1)复旦大学化学系; (2)复旦大学现代物理研究所
Published: November 2020

The thermal desorption spectra of propene and oxygen adsorbed on blue tungsten oxide WO2.90 have been measured by means of flash heating the sample in ultra high vacuum. It has been discovered that at room temperature only one adsorption state of propene on blue tungsten oxide surface exists, which corresponds to a desorption peak at the temperature around 100℃ appeared in the thermal desorption spectra. The desor- ption parameters determined by the experiment are: n=l (first order desorption) and the activation energy of desorption Ed=10.1 kcal/mol. The probability of forming stable adsorption state of propene on blue tungsten oxide decreases as the sample temperature increases. At room temperature, the blue tungsten oxide doesn't interact with oxygen significantly. But after raising the temperature to above 300℃, WO2.90 is oxidized into WO3 accompanying with a strong adsorption of oxygen. This implies that the blue tungsten oxide could be used as a promising oxygen getter in the vacuum valves.
A NEW MODEL FOR THE GROWTH OF SILICON DIOXIDE LAYERS
Authors: LU YU-ZENG  , Y. C. CHENG  ,   (1)成都电讯工程学院; (2)香港大学
Published: November 2020

A new model of oxidation is proposed to describe the growth of both thin and thick silicon dioxide layers. The assumption of the model is the presence of an exponential distribution of total net charges during oxidation. In this paper, we take into account the influence of the oxide charges and derive a new thermal-oxidation relationship of silicon, which agrees reasonably well with experimental data covering both thin and thick oxides. The relationship can be reduced to the well-known formula of Deal and Grove in the limit of thick oxide. With this model, we can also explain the effect of an external field on the oxidation rates satisfactorily.
QUANTUM CHEMISTRY STUDY ON BONDING OF DEFECT STATES IN AMORPHOUS CHALCOGENIDE
Authors: PENG ZHOU-REN  , DU QI-SHI  , LI BING-RUI  ,   兰州大学化学系
Published: November 2020

The defect states in chalcogenide glasses, including positively charged, negatively charged and neutral three-fold coordinated sulphur clusters, were studied by SCF MO CNDO/2 method. By comparing energies of the clusters, net charges of atoms, bond order functions and other parameters, conclusion has been drawn which is in good agreement with that of Kastners, and thus supports his valence-alternation pairs theory. The effect of lone-pair electrons on bonding in defect states is also discussed and it is shown that they play a significant role in chalcogenide glasses.
DISTRIBUTION CHARACTERISTICS OF DEEP LEVEL WAVEFUNCTIONS IN BLOCH SPACE
Authors: LI MING-FU  , REN SHANG-YUAN  , MAO DE-QIANG  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学研究生院
Published: November 2020

A simple method in the framework of Koster-Slater Green's function calculation and central cell defect potential (CGDP) approximation is used to calculate the distribution of deep level wavefunctions in Bloch space for Si, GaAs and GaP for the first time. Convergence properties are discussed. It is shown that for definite number of energy bands in the host crystal model, the convergence of deep level wavefunction calculations is faster than that of deep energy calculations.
DISCRIMINATION OF THE STABILITY OF SIMULTANEOUS EQUATIONS FOR OBTAINING LATTICE CONSTANTS OF LOW-SYMMETRY CRYSTAL SYSTEMS
Authors: GUO CHANG-LIN  , HUANG YUE-HONG  , YAO GONG-DA  , LIU YUN-JI  ,   中国科学院上海硅酸盐研究所
Published: November 2020

Some combinations of simultaneous equations for obtaining lattice constants of low-symmetry crystal systems can lead to a serious accumulation of errors and the formation of abnormal state equations. A method of solving the nermal state equations to obtain lattice constants by using the inverse matrix to discriminate the stability of simultaneous equations is given in this paper. Pratical example proves that the method is quite explicit and reliable and satisfactory results can be obtained.
POSITRON LIFETIME SPECTRA AND SCANNING ELECTRON MICROSCOPE INVESTIGATIONS DURING THE CRYSTAL-LIZATION PROCESS OF AMORPHOUS IONIC CONDUCTOR B2O3-0.7Li2O-0.7LiCl-xAl2O3
Authors: SU FANG  , YU WEI-ZHONG  , DAI DAO-YANG  , ZHAO ZONG-YUAN  ,   (1)清华大学物理系; (2)中国科学技术大学基础物理中心; (3)中国科学院物理研究所
Published: November 2020

The traditional pressed powder-samples spoil seriously the accuracy and reproduci-bility in measurement of positron lifetime spectra and scanning electron microscopy. This paper has overcome the above difficulties by preparing large amorphous disk-samples, and obtained new result of positron lifetime spectra and scanning electron microscopy during the crystallization process.According to our experiements on amorphous ionic conductor B2O3-0.7Li2O-0.7LiCl-xA12O3, we find that the mean lifetime of positron at room temparature is not affected by content Nariation of A12O3, mean lifetime of positron decreases greatly after full crystallization. Moreover, during the beginning of the crystallization process mean lifetime of positron of sample of x=0.15 exhibits a notable anomalous enhancement, which occurs within the same temperature range while the anomalous enhancement of ionic conductivity appears.
RESISTIVITY OF METALLIC GLASS CuTi
Authors: CAO ZHONG-SHENG  , ZHAO ZHONG-XIAN  , FENG BEN-ZHENG  ,   (1)昆明贵金属研究所; (2)中国科学院物理研究所
Published: November 2020

We choose the typical metallic glass Cu1-xTix alloys with two concent ations (x= 0.300 and x=0.325) made by melt-spinning technique as the sample. The X-ray diffraction, DTA and DSC analyses show that the samples exhibit typical amorphous charac-teristecs. In the wide temperature range 2-700 K, the resistivity is in aceordance with Mooij rule. Based on the Nagel nearly free electron model, Mott s-d scattering model, quasi-particles excitation by disorder configuration model and two-level tunnelling model for the electrical transport properties of amorphous alloys, the results are analysed,. The theoretical results in two level tunnelling model agree with the experimental data much better.
CONVERGENT BEAM ELECTRON DIFFRACTION STUDY OF C14 TYPE LAVES PHASE IN GH 302 ALLOY
Authors: WANG DA-NENG  , ArNe OLSEN  , YE HENG-QIANG  ,   中国科学院金属研究所
Published: November 2020

The dendritical spaped precipitates in GH 302 alloy were identified as C14 type Laves phase by means of CBED, SED and X-ray mitro-analysis.
TRANSPORT THEORY WITH INFRARED DIVERGENCE
Authors: DENG HUI-FANG  , LIU FU-SUI  ,   (1)北京大学物理系; (2)江西师范大学物理系
Published: November 2020

In this paper, based on a physical picture of the unified theory of the low frequency fluctuation, dissipation and relaxation phenomenon, some transport features of a non-Markovian process are explored. It is found that: (1) due to the effect of infrared divergence the diffusion coefficient, the mobility, and the viscosity as well as the generalized MD relation (MD) (i.e., Nernst-Einstein relation) and the generalized DV relation (DV) which exist among these coefficients, in general, are dispersive and the degree of the dispersion depends on a single parameter n, the infrared divergence exponent. If n goes to zero, all results immediately reduce to the classical forms; (2) the MV relation, neither depending on the nature of the transport process nor on the structure of the medium, seems to be generally valid and (3) the functional form of the generalized diffusion coefficient is identical with that of the generalized mobility, and that of the MD relation with that of the DV relation. The prediction of the dispersive diffusion is in good agreement with the recent experiment. The MD relation has been surmised ought to exist. If it exists, the prediction of dispersive mobility would be true.
TEMPORAL AND SPATIAL DISTRIBUTION OF DIRECTOR ANGLES IN SOLITON EXPERIMENTS OF LIQUID CRYSTALS
Authors: SHU CHANG-QING  , XU GANG  , LIN LEI  ,   中国科学院物理研究所
Published: November 2020

It is pointed out that more than one temporal and spatial distribution of director angles can be obtained from the interference patterns (varying in space and time) of transmitted polarized (monochromatic and white) light from liquid crystals. When specific physical conditions (e.g. the time variation of the local velocities of nonlinear waves described by shearing director equation of soltons) are taken into account, the above uncertainty can be removed. Detailed discussions on the case of solitons in shearing nematics are given. Numerical calculations show that the spatial distribution of director angles given in Eef. [5] is in contradiction to the directions of velocities of the three dark lines (under white light) observed experimentally if the one-dimensional shearing director equation of solitons is assumed. A distribution of director angles in better agreement with experiments is given.
DAMPING EFFECTS OF WEAK PROCESSES IN PION CONDENSATE ON NEUTRON STAR VIBRATION
Authors: WANG QING-DE  , LU TAN  ,   南京大学天文系
Published: November 2020

In the core of some massive neutron star there may appear pion condensate. The weak processes such as μ(p1)→μ(p2) + e- + ve and μ(p1) + e→μ(p2) + ve (i. e. equation (9) and (10) of this paper), in pion condenate,have been proved to be essential in damping the radial vibrations in the neutron star. The time scale of this damping effect is model depen dent and may be several days.Considering processes (9) and (10), the equilibrium condition in the pion condensate is μπ=μe. However, only irreversible processes could damp the vibration, so the key parameter here should be ξ=(μπ,-μe)/kT describing the deviation from equilibrium. In this paper, we have derived the reaction rates of processes (9) and (10), and the related neutrino luminosities, and done numerical calculations. Results obtained are the relations of W-t and T-t, as shown in Fig. 2 and 3, using Wv and T to denote the vibrational energy and the temperature of the neutron star respectively.
THEORETICAL CALCULATIONS OF ATOMIC TWO PHOTON IONIZAT1ON PROCESSES
Authors: WU YING-JIAN  , LI JIA-MING  ,   中国科学院物理研究所
Published: November 2020

Based on a Hartree-Slater self-consistent theory, we calculate two-photon ionization cross-sections of Cs and Xe as illustrative examples. Our theoretical method can easily be applied to calculate other types of two-photon transitions and can also be extended to calculate higherorder multiphoton ionization processes. Comparing our theoretical results with available experimental data and other theoretical results, we can discuss the validity of our theoretical method. For two-photon ionization processes of alkali atoms (e.g. Cs), our results are in good agreement with recent accurate experimental measurements.
THE CRYSTAL STRUCTURE OF PbBi2Nb2O9
Authors: LI DE-YU  , WANG PE-LING  , XU YUE-YING  ,   中国科学院上海硅酸盐研究所
Published: November 2020

Crystal of PbBi2Nb2O9 belongs to orthorhombic system with space group D2h23 - Fmmm, z = 4 and cell parameters a = 5.4806(7) ?, b = 5.4791(7)?, c = 25.416(3) ?, V = 763.2(2) ?3, Dobs = 7.91g/cm3, Dx = 8.26g/cm3, μ(Mo,Kα) = 678.38cm-1, F(000) = 1608. The crystal structure was determined by the direct method (Multan-78) and Fourier-technique. The coordinations of atoms, isotropic and anisotropic thermal parameters were refined to R = 0.107 for 396 independent reflections by block-diagonal least-squares refinement technique. The Nb-O octahedra are deformed from Oh to C4v and the atoms Nb deviate 0.225 ? from the center along the directions of the 4-fold axes. The deformation of the Nb-O octahedra and the position deviation of metal ions Nb may be the structual reasons resulting in the ferroelectric properties of PbBi2Nb2O9.
THE DELAY EFFECT OF PULSE AVALANCHE DISCHARGE PROCESSES OF XeCl LASER AT HIGH GAS PRESSURE
Authors: LOU QI-HONG  ,   中国科学院上海光学精密机械研究所
Published: November 2020

We analysed the pulse avalanche discharge processes of XeCl laser at high gas pressure up to 10 atm. The influences of delay effect on the discharge formation time were discussed. By comparing the calaulated results with experimental data observed in the XeCl laser pulse avalanche discharge, the critical avalanche track length was obtained as ξ≌1 mm.
ON THE THEORY OF SURFACE SUPERFLUIDITY IN 4He-3He MIXTURE FILMS
Authors: WANG CHENG-TAI  , Yü LU  ,   (1)清华大学物理系; (2)中国科学院理论物理研究所
Published: November 2020

In this paper, a theoretical model describing the surface superfluidity in 4He-3He mixture films is proposed to obtain an expression for the potential energy of vortex pairs in the presence of 3He. The static recursion relations as well as the dynamical delectric function are then derived using this form of potential energy. The period shift 2△P/P and the dissipation Q-1 for the torsional oscillator near TC are calculated theoretically and compared with the experimental results of McQueeney et al.
A NEW METHOD FOR DETERMINING THE ENERGY GAP OF A SUPERCONDUCTOR USING THE MAXIMUM IN DIFFERENTIAL CONDUCTANCE OF ELECTRON TUNNELING SPECTRUM
Authors: LI HONG-CHENG  , WANG RUI-LAN  , WANG PING-SHU  , GUAN WEI-YEN  ,   中国科学院物理研究所
Published: November 2020

A new method for determining the energy gap of a superconductor using the maximum in the differential conductance curve of electron tunneling spectrum is given in this paper. The Vmax/kT versus △/kT curve was caculated from tunneling theory, Vmax, the voltage of the conductance maximum, can be measured from electron tunneling spectrum.△/kT can be found from this curve, then the energy gap △ can be caeulated. This method is simple, fast and accurate. The accuracy almost approaches that of the curve fitting method.
A STUDY ON THIN FILM WITH COMPLEX REFRACTION INDEX BY SPECTROSCOPIC ELLIPSOMETRY——OPTICAL CONSTANT DISPERION AND GROWTH RATE OF ITO
Authors: FENG HONG-AN  , YU YU-ZHEN  , HUANG BING-ZHONG  ,   中山大学
Published: November 2020

In this paper, we propose a method which make it possible to investigate the films with complex refraction index using spectroscopic ellipsometry. By introducing a new aiming function, the search parameters space can be reduced to 4-dimension, so we not only can calculate the optical constant and the thickness of the films, but also the optical constant of the substrate simultaneously. Using this method, we studied the optieal constant dispersion and the growth rate of ITO films which is deposited on Si substrate by sputtering. At the same time, we observed that the apparent optical constants of the Si substrate were changed.
THE 2Δ0/(kBTc) AND THE PARAMETERS OF THE PHONON SPECTRUM FOR AMORPHOUS SUPERCONDUCTORS
Authors: CAO XIAO-WEN  ,   中国科学院等离子体物理研究所,合肥
Published: November 2020

In this paper, we propose a formula (2△0)/(kBTc)=4.95[1-T01/2/A(1/(λω0)+1/(20λ)+1/(20))], it can describe well the relations between 2△0/(kBTc) and the parameters of the phonon spectrum of disordered and amorphous superconductors for the non-transition metals and their alloys. Here T0 =0.66K, A =1/5K1/2, λ is electron-phonon coupling constant, is the average phonon frequency and ω0 the high frequency cutoff of the effective phonon spectrum a2F(ω). The values of 2△0/(kBTc) of disordered and amorphous superconductors which have the known parameters of the phonon spectrum have been calculated. Agreement with experiment is within a few percent. We show that the amorphous superconductor of non-transition metals and alloys is either a strong coupling superconductor which has a 2△0/(kBTc) valve much larger than the BCS theory value or a weak coupling superconductor which has a considerable smaller one than the BCS theory value.
LOW TEMPERATURE MAGNETIC PROPERTIES OF AMORPHOUS Ndx T1-x (T=Fe, Co, Ni) THIN FILMS
Authors: DAI DAO-SHENG  , FANG RUI-YI  , LIU ZUN-XIAO  , WAN HONG  , LAN JIAN  , JI YU-PING  ,   北京大学固体物理研究所
Published: November 2020

The magnetic structure and anomalous behavior of the temperature dependence of magnetization at low temperatures for amorphous NdxT1-x(T=Fe, Co, Ni) thin films are discussed. It has been observed that the sudden drop of magnetization is at about 20 K, and the temperature corresponding to the sudden drop on the magnetization curves does not change with composition, we suggested that as the neodymium component exceeded a certain amount, in the ground state the asperomagnetic and the speromagnetie structures may coexist for these amorphous alloys. The sudden drop of magnetization at about 20K may be explained by the phase transition between the speromagne-tism and paramagnetism. The critical composition of neodymium component for eoexi-stance of these magnetic structures approximately corresponds to x≥0.45, 0.20 and 0.08 for Nd-Fe, Nd-Co and Nd-Ni amorphous thin films, respectively.
THE INFLUENCE OF O2 ON THE ELECTRONIC STRUCTURE OF CLEAN AND ION SPUTTERED SURFACES OF 2H-MoS2(0001)
Authors: HU YONG-JUN  , LIN ZHANG-DA  , WANG CHANG-HENG  , XIE KAN  ,   中国科学院物理研究所
Published: November 2020

UPS, XPS, AES and LEED have been applied to study the samples prepared by low energy N+(0.5keV) sputtering slightly the clean cleaved surface of 2H-MoS2 (0001). From UPS (He Ⅰ, He II) spectra the shifts of EF of d band were observed. A "shoulder" or a band tail above the top of the d(z2) band raised with the time of ion bombardment so that the shape of the d(z2) band became broad. The new state showed chemically active to O2 exposure at room temperature. We propose that these shoulder states arise from the new unsaturate bonding d-electrons of Mo atoms around the vacancies of S at the outermost layer of the surface. This new surface electronic state may be correlated with the catalysis active site for hydrodesulfurization (HDS).
THE INFLUENCE OF Si ON PHASE RELATION AND HYDROGEN ABSORPTION PROPERTIES OF LaNi5
Authors: LIANG JING-KUI  , ZHAO JING-TAI  ,   中国科学院物理研究所
Published: November 2020

In this work, the phase relations of LaNi5-xSix(x≤1.25) have been studied by means of X-ray powder diffraction method and DTA method, and the hydrogen absorption properties of the samples have been measured using gas-gathering method. The α-phase (LaNi5) and the new discovered ternary compound LaNi4Si (β) forms a eutectic system. The eutectic reactionis α+β(?)1170℃/ L. The eutectic point is at x=0.96. In the single phase area of a-phase, the lattice parameter a de-creases and c increases with the substitution of Si, The ternary compound LaNi4Si belongs to orthorhqmbic system with lattice parameters a = 8.382?, b = 5.210?, c = 3.989?. The measured density is 7.59 g/cm3. There are two formula unit per unit cell. Possible space groups are D2h5,C2v2,C2v4. The hydrogen quantities absorbed by the La1-ySiyNi5 samples decrease rapidly with Si content increasing. The absorbed hydrogen quantities of La-Ni5-xSix samples vary slowly with the Si content and the plateau pressures decrease. The formation free energy of LaNi4.8Si0.2H6.5 is 475 cal/mol H2. Si substitution increased the stability of hydrides. The new compound LaNi4Si has reversible hydrogen absorption and desorption properties with formation of hydride LaNi4SiH3.6.
A DISCUSSION ON FINITE-TEMPERATURE QCD IN MINKOWSKI SPACE
Authors: LIU QIANG  , WANG KE-LIN  ,   (1)上海交通大学; (2)中国科学技术大学
Published: November 2020

The scalar field theory at finite temperature of real time suggested by Nieme and Semenoff is extended to the ease of gauge field. It is useful in finite temperature QCD in Minkowski space. With the propagator of finite temperature QCD introduced in this paper, the two-loop correction of free energy of high temperature QCD is calculated and the result is consistent with that obtained by Kapusta with the method of Euclidean field theory.
ATOMIC POSITIONS OF DEUTERIUM IN DTGS CRYSTAL DETERMINED BY NEUTRON DIFFRACTION
Authors: CHENG ZHI-XU  , CHENG YU-FEN  , ZHANG PAN-LIN  , YAN QI-WEI  ,   (1)中国科学院物理研究所; (2)中国原子能科学研究院
Published: November 2020

The crystal structure of the partly deuterized triglycine sulfate was studied by four-circle neutron diffractometer. The result is compared with TG-S data obtained by Kay et al. The distance between triglyeines groups increases hlightly by deuterization, The relative increases of lattice parameters a, b and c are 0.47%, 0.50%, 0.19%, respectively. The probability of deuterium substitution, P, on various hydrogen sites is obviously divided into two classes; P=0 for hydrogens locked in C-H bonds, while P= 0.84±0.03 for all the others.
MAGNETIC PROPERTIES OF THE SPIN GLASS LaFeyNi5-y
Authors: DAI SHOU-YU  , SHEN BAO-GEN  , WANG ZHONG-QUAN  ,   中国科学院物理研究所
Published: November 2020

The magnetic properties of the spin glass La FeyNi5-y (0.5≤y≤1.1) are reported. The spin freezing temperatures, Tf, in these alloys have been measured. It is observed that at lower temperatures there is a transition from the paramagnetic (PM) to the ferromagnetic (FM) phase for y≤0.9 and the Fe-content dependence of the freezing temperature is approximately linear. There is a transition from the PM to the FM and from the FM to spin glass phase for y≥1.0.
A PHASE DIAGRAM OF THE ALLOYS OF THE Gd-Ni BINARY SYSTEM
Authors: PAN YU-YING  , ZHENG JIAN-XUAN  , LI MING  , YANG HUA  ,   广西大学物理系
Published: November 2020

The Gd-Ni binary system has been reinvestigated by X-ray diffraction method and differential thermal analysis. The phase diagram has been determined. In this system, the following nine intermetallic compounds were found: Gd3Ni (decomposes at 735℃), Gd3Ni2 (decomposes at 690℃), GdNi (M. P. 1280℃) GdNi2 (decomposes at 1010℃), GdNi3(decomposes at 1110℃), Gd2Ni7(decomposes at 1200℃), GdNi4(decomposes at 1270℃), GdNi5(M. P. 1480℃) and Gd2Ni17(decomposes at 1285 ℃). Three eutectics occur: Gd3Ni-Gd3Ni2(635℃, ～32 at% Ni), GdNi2-GdNi2(880℃ ～56 at% Ni) and Gd2Ni17-Ni(1275℃, ～95 at Ni). Neither Go in Ni nor Ni in Gd shows any detectable solid solubility.
A COMPLEX MODEL FOR THE HYDROGENATED VACANCY IN CRYSTALLINE SILICON
Authors: DAI GUO-CAI  , GUAN DA-REN  , DENG CONG-HAO  ,   (1)山东大学理论化学研究室; (2)山东大学物理系
Published: November 2020

The electronic energies of hydrogenated silicon vacancy which has Td symmetry are calculated. Using the method of completely neglecting of differential overlap (CNDO), we find the probability of the formation of the hydride quartet, and the effect of interaction between four SiH units in the model. We conclude that the hydride quartet complex is a more plausible model for the hydrogenated vacancy in crystalline silicon than that with four SiH bonds unrelated one another.
DETERMINATION OF THE GAP STATE DISTRIBUTION IN a-Si:H BY THE METHOD OF INTERNAL PHOTOEMISSION TRANSIENT CURRENT TEMPERATURE SPECTROSCOPY
Authors: SU ZI-MIN  , PENG SHAO-QI  ,   中山大学物理系
Published: November 2020

In this paper, we present a new method of determination of the gap state distribution in a-Si :H—the internal photoemission transient current temperature spectroscopy(IPETCTS). By this method, we suceeded in determining the GDOS distribution N(E) in a GD a-Si:H film. The result agrees in shape with that obtain ed from the typical field effect measurement, while the magnitude of the gap state density.obtained from the IPBTCTS is smaller by one to two orders than that from field effect measurement.
STUDIES OF FREQUENCY SPECTRUM OSCILLATING PHENOMENON OF FREE ELECTRON LASER AMPLIFIER
Authors: JIANG HUA-BEI  ,   成都电讯工程学院微波电子学研究所
Published: November 2020

In this paper, on the basis of a single-particle model, the dispersion equation is obtained after considering the first perturbation term of relativistic energy factor. The results show that the frequency spectrum of free electron laser amplifier (FELA) exhibit oscillating phenomenon when injected electron energy is large enough. The origin of this phenomenon is attributed to perturbing effect of the relativistic energy factor. A some what detailed discussion is given.
STUDY OF Si SOI OPTICAL PROPERTIES BY USING ELLIPSOMETRIC FOUR-PHASE MODEL
Authors: ZHU WEI-WEN  , ZHU WEN-YU  , WANG WEI-YUAN  ,   中国科学院上海冶金研究所
Published: November 2020

The ellipsometric parameters of LPCVD poly-Si on insulating SiO2 (Si SOI) before or after annealing with laser or RF inducting graphite strip heater were measured by speetroscopic ellipsometry over the wavelength interval 3000-5000?. The four-phase model of ellipsometric spectra was presented by matrix multiplication and the Monte Carlo simulation was used to calculate both ε1 and ε2 of Si SOI. The lattice perfec-tion of Si SOI after annealing is discussed