In this note, the explicit form of the N soliton solutions for a class of the system of LS nonlinear wave interaction have been obtained by using Hirota's method.

The observation of growth steps on Pt(110) was carried out by means of reflection electron microscopy. The huge terraces on Pt(110) have a zigzag shape, showing that the risers of those steps are composed of (111) and (111) facets. The characteristics of growth steps on Pt(ll1) are also presented.

The wormhole effect is discussed in the d-dimensional Einstein- Yang-Mills theory. We show that the peak of the probability function leads to the explanation of the spontaneous compactification down to a four-dimensional spacetime and vanishing four-dimensional cosmological constant, i.e., the observable spacetime must be four-dimensional and flat.

We analyse the influence of continuum corrections over the quantum chromodynamics sum rule for the 1-- three-gluon conserved current. The mass of the 1-- vector glueball is determined to be 2.4GeV. It should be noted that this mass value does not sensitively depend on the choice of the combination of the two independent currents.

In order to study the effectivity for the constrained Hartree-Fock (CHF) method, a quasi-spin model containing two kinds of interaction is proposed. The exact solution of the model Hamiltonian in SU(2)xSU(2) basis, the HF and some CHF solutions as well as the ground state phase transition are discussed.

A new method based on the third-order correlation function of coherent Raman scattering has been suggested for the picosecond laser pulses. It has been shown theoretically and experimentally that when coherent Stokes and antistokes Raman scattering are measured at the same time, the temporal characteristics of two different ps laser pulses can be obtained simultaneously.

Coherent anti-Stokes Raman spectroscopy is used for time-resolved detection of chlorine atoms produced by photodissociation of chlorine molecules. The rate constants of elementary reaction Cl+Cl+C1₂=2C1₂ are determined.

The microscopic and macroscopic second-order optical susceptibilities of ten benzene derivative molecules and three crystals were calculated and discussed, basing on the nonlinear optical active group theory.

This paper reports the growth and two-wave coupling properties of (K_0.5-Na_0.5)_2z( Sr_0.75Ba_0.25)_1-zNb₂O₆( z = 0.1, 0.05 and 0.03) crystals. Comparing to the others, the crystal at z=0.05 has shorter response time and larger two-wave coupling gain coefficient. The gain coefficient of it surpasses that of SBN:Ce.

The density of 570nm centers in KMgF₃ crystals colored by electron beam bombardment at 200K could be increased by irradiating the crystals with 337nm, 400nm, and 445nm lasers at room temperature or 200K, respectively. The near infrared laser operation using 570nm centers in KMgF₃ crystals was realized at room temperature. The tunable range of the laser is from 720nm to 820nm.

We introduced the Lennard-Jones potential into the two-dimensional Collins model system. The additional potential energy has been derived for two-dimensional solid. According to the classical statistics, the Lindemann coefficient δ_c of this system is calculated along the melting line. The calculated results shows that the value of δ_c approximates to 0.08, which is in agreement with one of the rare gas solids in the order of magnitude.

The interaction of the electrons with the phonons in GaAs/AlGaAs quantum wells, quantum well wires, and quantum well boxes has been studied by meansuring their time resolved photoluminescence (PL) spectra. In the quantum well (Q W) system, relaxation time of the electron energy of the narrower well is shorter than that of the wider well. It is attributed to the stronger interaction of the electrons with the interface mode phonons. In the Q W wires and Q W boxes, the shortening of the relaxation time is obvious. It is due to the stronger electron-phonon interaction caused by the reduction of screening effect. Our experiments also demonstrated the incident laser intensity dependence of the relaxation time.