The monodromy of Liouville field in the punctured Riemann sphere is disc us-sed. The exchange algebras and exchange matrix of the field are obtained by means of uniformization in Liouville theory. A relation between the exchange matrix and SL(2n,R) is also presented.
Based on Walecka model, the refativistic microscopic optical potentials (RMOP) for nu-cleon-nucleus are investigated in the improved local density approximation (ILDA). The RMOP in ILDA, which include the effect of interaction range, are obtained by folding RMOP in LDA with Gaussian form factors. The parameters in Gaussian form factors are adjusted to fit the empirical values of the volume integra...
The systematics charaters of the (n,T) and (n,3He)reaction cross sections have been studied. On the basis of odd-even effect, the systematics formulae of the reaction cross sections are obtained as σu,q=(A1/3+1)2aexp[β(N-Z+δ)/A]. A set of fitting empirical para meters by using the least square method are extracted. For the (n,T) reactions, α and β values are 327.602, 9.592 and -24.495,-14.038, res...
Based on an independent-particle-approximation (i.e. the multiplescattering self-consistent-field theory), we studied the electronic structures of Rydberg states of the small diatomic molecules H2, He2 and the He2+ molecular ion. The principal quantum number of the first state of the Rydberg series is determined from a convention of the limit of the molecular electronic configuration. The dynamics...
We have measured the cross section [σAl=4.2×10-17cm2±36%] for associative ioniza-tion occurring in collisions between two Na(3P) atoms, by measuring the current reselting from excitation of Na vapor with CW-laser radiation. The major experimental difficulty in measurements of this type is in the determination of the number density and spatial distribution of excited atoms. Here we have measured th...
By using a distorted-wave Born exchange approximation, the direct ionizarion cross section of boron-like ions by electron impact have been calculated. The interferences between direct and exchange amplitudes make important contribution in the process of ionization. The calculated results indicate that the "Natural Phase" approximation is better than the "Maximum Interference" approximation, while ...
α-C:H films produced on various substrate materials by using radio frequency plasma vapor deposition method have been analysed by Raman spectroscopy, indicating both diamond-like and diamond phases appear in these films. After analysing the transmittance and the refractive index of the films in the visible range, we suggest that the deposited film on silicon solar cell can be used as antireflectiv...
The system's product of length with bit rate is limited by the Gordon-Haus effect of pulse arrival time in the all-optical soliton communication systems with energy compensated periodically. We analyze effect of perturbation on the group velocity shift in a lossy fiber, and jitter of the soliton arrival time caused by gain noise in a lumped or distributed energy compensated system. The maximum len...
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES
Profiles of Hα,Hβ and Hγ lines, cmited from a TEA CO2 laser induced silane plasma, are measured with an optical multichannel analizer (OMA Ⅲ) The experimental results show that FWHM (full width of half maximum) of the three lines increases with the main quantum number of the corresponding upper level of the transiti ons, i.e. △λ1/2(Hα)1/2(Hβ)1/2(Hγ), this suggests that the dominant broadening mech...
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES
The high temperature traps of AlGaAs/GaAs GRIN-SCH SQW lasers fabricated by MBE has been studied using DLTS technique.The majority and minority carrier DLTS spectra show that high temperature trap, having larger capture cross section and concentration, exist in n-AlGaAs layer of lasers. This trap may correlate strongly with oxygen content of AlGaAs layer grown by MBE. It may be responsible for the...
In situ observation o phase transition in LaAlO3 crystal with the convergent polarized interference pattern at 20° to 800℃ was done. The experiment revealed the phase transition from rhombohedral to cubic at 560℃. The morphology of twin and its concentration, the cry-stallograpliic orientation of domain and the change of topography image of domain and inclusion near Tc have also been studied.
In this paper a description for the phase formation in a binary planar diffusion couple is presented in the form of a system of differential equations. Not only diffusivity of constituents but also interfacial reaction at phase boundary are introduced in this system of equations. The formation process of phases including the sequence, the growth or shrinkage of the phases can be described clearly ...
The reconstruction of diamond C(100) surface is studied with local density functional theory and extended numerical basis set. A cluster C49H36 is adopted to simulate the surface, where H atoms are saturation atoms. According to the calculation of forces exerted on the surface C atoms, an optimized C(100) surface atomic structure is achieved with the surface dimerized bond length, C-C, equals 1.41...
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
The formula of dissociation energy and total energy level number of diatomic molecules is obtained by using the q-deformed oscillator model- It is shown that the dissociaron energy of the model is greater than the experimental value up to about 10 percent. The method is much in advance of the usual Birge-Sponer method and can be used as a new approximate method to evaluate the dissociation energy ...
In this paper, we show that: when the wave vector Q is not infinitesimal but sufficiently small, there exist mobility edges in the region of V c=±|2-V|, The result is different from that of duality theory.
Na5Eu(MoO4)4 is a stoichiometrlc host luminescent material. The light emessioB comes from high concentration host ions Eu3+. In the present work, the effects of hydropressure on fluorescence of Eu3+ in Na5Eu(MoO4)4 are invistigated under 0-5.0 GPa using a diamon anvil high pressure microspectroscopic system. According to crystal field theory, the energy level fexpressinns of Eu3+ (in approximatry ...
By using the Green's function method, we have studied effect of intersubband impurity scattering on the quantum correlation of conductivity and Hall coefficient. It is shown that crossover behaviors appears in both coductivity and Hall coefficient when the situation changes from one-subband occupation to two-subband occupation.
In this letter, we develop a theory in the mean-field approximation for the spin-flop transition in La2CuO4 when the magnetic field is parallel to the CuO2 plane. The temperature dependence of the critical field predicted by our theory agree qualitatively with the experiment. However, there is no multicritical point according to our theory. The origin of this disagreement is discussed briefly.
Robertson's theory is applied to derive the master equations of a spin under the action of a static longitudinal field and a rotating transverse field. The damping and the steady state of the spin are obtained as functions of field strength, frequency and the coupling with the bath The structure of the steady state and its origin are discussed.
We have used the Monte Carlo method to study the phase diagram of the ferromagnetic bond-dilute Blume-Capel model, combined with the finite-size scalar theory, and obtained the transition temperatures in zero crystal field, Comparison is made between the results of this simulation and other methods. The influence of the bond-dilute concentration on the tricriti-cal points is determined using the M...
Based upon the spin wave theory, the spontaneous magnetization of small particle system at low temperatures is studied by means of solving the Heisenberg model directly. Investigations show that the spin waves are frozen out at ultra-low temperature, and the Bloch T3/2 law is no longer correct in any region of temperature. At the same time, the distribution of the probability for spins to be activ...
The photoconductivity along the polymer hain direction for poly [bis(p-toluene sulpho-nate) ester of 2,4-hexadiyne-l,6-diol] (PDA-TS) single crystal is investigated. After analyzing the limitation of Onsager's model for bimolecular geminate pair thermalizing, a new model of photogenerated charge carries is presented and it is used to explain the dependence of stationary photocurrent Iph on the ene...
In this paper, the mechanism of photo-carrier generation in polymer with conjugatedtriple bond-poly(bis(p-toluene sulphonate)ester of 2,4-hexadiyne-l,6-diole)(PDA-TS) isstudied. We infer that photo-carriers are generated by dissociation electron-hole pairs which were produced by photo-excitation initially, and by thermalization of polaron-excitons which were formed through relaxation, respectively...
Polarized Raman spectra of single crystal Li2B4O7 have been measured in the wavenum-ber shift range of 50-3000cm-1 at room temperature. The infrared absorption spectrum of Li2B4O7 has also been measured in the range of 200-4000cm-1 for powder samples dispersed in the pressed KBr disks. Based upon the experimental results of LO-TO splitting, the effective charge and mode strength of polar modes are...
By considering a gedankenexperiment of adiabatically lowering a box containing matter with rest energy E and entropy S to a black hole, Bekenstein claimed that the necessary condition for the validity of the generalized second law of thermodynamics is S/E ≤ 2πR, where R is the effective radius of the box, Unruh and Wald claimed that this condition is not necessary but the acceleration radiation ca...