THE ACQM THEORETICAL CALCULATION OF LOW—LYING EXCITED STATES FOR HeH

The Low-lying excited states of HeH have been calculated by arrangement channel quantum mechanics(ACQM),The calculated potential curves,equilibrium geometry,Rc.dissociation energy Dc.harmonic vibration frequency ω0 and quadratic force coustant F2 are comparable with Ci calculations.     

CALCULATION ON A CLUSTER MODEL FOR THE ELECTRONIC CHARGE DENSITY AT NUCLEAR SITE AND THE ELECTRONIC STRUCTURE PARAMETERS OF α IRON

In order to investigate the M6ssbauer isomer shifts and its related electronic charge densities for some substances, the electronic charge density at nuclear site of a iron have been computed for an octahedral cluster Fe₆ with SCF MS-X_α method. Some other electronic structure parameters of the cluster have also been obtained, such as the orbital energy distri- bution, the electron density of states, the Fermi level and various kinds of electron energies, etc. The cohesive energy of α iron have also been calculated and discussed.     

MEASUREMENT AND CALCULATION OF ELECTROMECHANICAL PARAMETERS OF PIEZOCERAMIC THIN CYLINDRICAL TUBE TRANSDUCERS

On the basis of the electrical admittance equation for the unloaded tangentially and radiallypolarized piezoceramic thin circular cylindrical tube,the method and formulas,and the prognm forcalculating the electromechanical parameters from the measured data are presented.If the size,density,capcitance at low frequency,frequencies at maximum and minimum admittances near theradial resonant frequency and the longitudinal resonant frequency,etc.are known from themeasurement,then the Young's modulus,Poisson's ratio,electromechanical coupling coefficents,permitivity and piezoelectric constants can be calculated with the formulas given here.Practicalmeasurements and calculations for several samples have been carried out with this method.     

THREE—BODY SCATTERING CROSS SECTION AND SINGULARITIES OF THE T—MATRIX

Cross section is a fundamental concept in collision theory. This concept hasbeen formulated for binary collisions,i.e.,collisions between two incidentparticles.As far as binary collisions are concerned,one can describe withdifferential and integrated cross sections any elementary processes includingdissociation and rearrangement as well as elastic and inelastic scattering.It isbelieved,however that besides binary collisions there are three-body colli-sions,i.e.,collisions among three incident particles.Thus it is of general     

ON THE BOUNDARY CONDITION AND CANONICAL S-WAVE HAMILTIONIAN FOR THE DYON-FERMION SYSTEM——THE SURFACE LAGRANGIAN AND GAUGE INVARIANT CHARGE CURRENT

By means of the surface Lagrangian and gauge invariant charge current, we make a detailed discussion to the physical meaning of each quantity in the boundary condition of the dyon-fermion dynamics; It is shown that adding the surface Lagrangian to the system is equivalent to selecting suitable boundary condition; By gauge trans-forming the Lagrangian by a charge generator, We get a corresponding U(1) charge current density which is both gauge invariant and spherosymmetrical. Ause of the canonical method and a careful treatment of surface terms show that the S-wave Hamiltonian given by Yamagishi requires amendment by a surface energy term.     

THE EFFECT OF ELECTRIC LOAD ON THE CHARACTERISTICS FOR PIEZOELECTRIC VIBRATIONAL SYSTEM

The effect of electric load on the piezoelectric vibrational system due to electroacoustic coupling isanalytically investigated.The analytical results show that:(1)when load impedance continuallychanges from ∞to+∞,the mechanical resonant frequency of the system would fill all frequencydomain from 0 to ∞;(2)the displacement and stress distributions also would change,even the dis-placement may be zero at both free ends(i.e.at points where stress is equal to zero). Finally,the experiments for longitudinal vibration of piezoelectric strip of lateral polarizationare given and compared with theoretical results.     

ACCURATE QUANTUM CHEMICAL CALCULATION OF CROSS SECTIONS FOR THE SYSTEM D+H2→DH+H

Accurate reactive scattering calculations of reactive probabilities and integral cross sections for the system D+H₂→DH+H were carried out by using the quantum mechanical time-dependent wave packet methods. In order to simplify the calculation, we introduced the centrifugal sudden approximation to reduce the effective degrees of freedom, and show results of new calcul ations. In particular, the present calculations were extended to all angular momentum and obtained reaction cross sections for a range of energies. The results were also compared with those of other theoretical calculations and the differences were discussed.     

G2 PREDICTION OF THE ENTHALPIES OF FORMATION FOR SOME DIATOMIC CATIONS AND NEUTRALS

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THE ENERGY SPECTRUM AND WAVEFUNCTION OF NUCLEUS 31Si——A TEST ON THE COMPOSITE PARTICLE REPRESENTATION THEORY

The nuclecus ³¹Si₁₇ is studied by the composite particle representation theory and compared with the shell model calculations. It is shown that the entire energy spectrum agrees with the shell model results very well, and the wave function is equivalent to the shell model wavefunction exactly. Therefore it strongly supports the composite particle representation theory.     

RAMAN SCATTERING OF α-ET3(ReO4)2 CHARGE-TRANSFER SALT

We describe the results of Haman studies on C=C stretch modes in α-ET₃(ReO₄)₂ charge-transfer salt with the incident laser beam polarised perpendicular and parallel to the large flat face of plate-like crystal. We have assigned central C=C stretch mode at 1454 cm^-1 and ring C=C stretch mode at 1470cm^-1. The change in ring C=C stretch vibration was observed at the metal-insulator transition of α-ET₃(ReO₄)₂ on warming due to the distortion of the ET molecules.     

THE DETECTION OF SIGNALS AND ESTIMATION OF PARAMETERS IN A RANDOMLY SPACE-TIME VARIANT CHANNEL

The detection performance of matched filter will be degraded and the errors of estimated para-meters of matched filter will be increased in a randomly space-time variant channel.The paperdiscussed this effect.The architecture and performance of optimum space-time processor are givenin this case.The way to construct a practical system is discussed.This paper corrects some am-biguous concepts on scatter function expression of partial coherence channel in some papers.     

CONSTRUCTION OF AN OPTICAL TWEEZERS—CALCULATION AND EXPERIMENTS

We report the construction of an optical tweezers system and the results of the trapping and the moving of living algal cells. Experimental study on trapping polystyrene spheres demonstrates the effects of the system parameters on the trap. The trapping forces on dielectric spheres are calculated using Ashkin's ray-optics model. The result shows that an objective with higher numerical aperture can build a more stable trap along axial direction than an objective with lower numerical aperture, though their transverse trapping forces are on the same order.     

APPLICATION OF CORRELATION—POLARIZA TION POTENTIAL TO THE LOW—ENERGY ELECTRON SCATTERING WITH ATOMS AND MOLECULES

Applicability of the correlation potential,which is currently used in the local density functional theory,to the low-energy electron-atom and molecule scattering is investigated with some examples of scattering processes.     

A STUDY OF RAMAN SCATTERING AND INFRARED ABSORPTION SPECTRUM IN A NEW SERIES OF MERCURY-BASED HIGH-Tc SUPERCONDUCTOR (Hg,Mo)Sr2(Y1-xCax)Cu2O6+δ

Lattice vibrations of the (Hg,Mo)Sr₂(Y_1-xCa_x)Cu₂O_6+δ—a new series of mercury-based high-T_c superconductor are analyzed with the aid ofgroup theory. The vibrations of species are given. They are 4A_1g+ B_1g+ 5E_g+ 7A_2u + B_2u+ 8E_u. The 4A_1g, B_1g and 5E_g modes are Ramma active, the 6A_2u and 7E_u are infrared active. Phonon vibration characteristics of the samples are studied using Raman scattering and infrared absorption spectra. The experimental results show that the typical phonon vibrational modes appear mainly at 145, 320, 440, 578, 592 and 645cm^-1, The intensities of the 145, 320, 440, 578 and 645 peaks decrease with increasing Ca content x and the position of 645 peak moves to higher wavenumber slightly. In this article, the phonan modes are assigned and their variation behavior with increasing Ca content x are discussed.     

ELASTIC SCATTERING OF K± MESONS BY 40—48Ca AND THE ANALYSIS OF NEUTRON DISTRIBUTIONS

The differential cross sections of the elastic scattering of K^±on ^40—48Ca are calculated in the framework of eikonal approximation. The theoretical values obtained by using different parameters are compared. Through adjusting the parameters of the neutron distribution, the improvement of the coincidence between the theoretical values and the experimental data is arrived. The result shows that the r.m.s radius of the neutron distribution of ⁴⁰Ca is smaller than that of the proton. (about 0.15fm smaller) and the surface thickness of the neutron distribution of ⁴⁰Ca is thinner than that of proton. This is consistent with the results of computation made by H.F. method and agrees with the analysis of elastic scaatering of protons in the mediate energy on ⁴⁰Ca by other authors.     

THE BETHE-SALPETER EQUATION FOR SPIN (0—3/2) ELECTROMAGNETIC BOUND SYSTEM AND ITS APPROXIMATE SOLUTION

In this paper. the Bethe-Salpeter equation for spin (0—3/2) electromagnetic bound system is derived. Under the ladder approximation the approximate B-S wave function with accuracy up to order 0(α) for this system is obtained. Utilizing this wave function, we estimated the cross section for producing (π⁺Ω^－) in Ω^－-p collision process.     

THE OVERLAP OF MAGNETIZATION AND THE COUPLING OF IMPURITIES WI丁H LATTICE FOR DM SPIN GLASS

The overlap of magnetization of the giound state in a RKKY spin glass system with the Dzyaloshinsky-Moriya interaction is studied based on the theory of infinite number of order parameter. It is shown that the nonmagnetic impurities are coupled with the host lattice.The results are in good agreement with experiments.     

THEORETICAL ASPECTS OF ELECTRON CAPTURE BY C~(6 ) AND O~(8 ) FROM H,He AND H_2

Many theoretical approaches to electron capture by C~(6 ), a nd O~(8 ) fromthe targets H,He and H_2 are discussed from the practical stand point at thepresent stage.The validity of several representative methods for the calcul-ation of total and state selective partial cross sections is given. For the total cross section in many theoretical methods can be appliedand give reasonable results.For the state selective partial cross section for adominant channel at low impact velocities manylevel coupled channel calcul-ations can be used and give reliable results,if it belongs to a dominant cha-nnel.     

THE COULOMB DISINTEGRATION CROSS-SECTION AND DECAY RATE OF THE SPIN (0－3/2) ELECTROMAGNETIC BOUND SYSTEM

In this paper, the coulomb disintegration cross-section and decay rate of the atom (π⁺Ω^－) are calculated by using perturbation expansion of the quantized composite field theory and relativistic B-S wave function for spin (0－3/2) electromagnetic bound system. The disintegration cross-section of the high energy atom (π⁺Ω^－) in screened coulomb field of nuclei is about σ=Z^4/3×2.9×10^－18cm², and the calculation result of the decay rate is w[(π⁺Ω^－)→π⁺Λ⁰K^－]/w[Ω^－→Λ⁰K^－]=1+O(α).