A. Z. Devdariani

Ionisation in thermal-energy collisions of a resonance-state atom with a ground-state atom. The role of quasimolecular term structure peculiarities

The inelastic collisions of He(1s2p 1P1) atoms with ground-state noble-gas atoms are studied using the kinetic plasma spectroscopy method. Quenching rate constants are found to be (25+or-5)*10-10, (27+or-5)*10-10 and (32+or-5)*10-10 cm3s-1 for Ar, Kr and Xe, respectively (T=600 K). A detailed theoretical interpretation taking the specific features of quasimolecular terms into account is developed. Good agreement between theory and experiment is obtained for He-Ar and He-Kr. Possible reasons for the discrepancy for the He-Xe system are discussed.

Temperature dependence of the edge of the spectral line in classical atomic motion

The purpose of this paper is to investigate the temperature dependence of the spectrum with a classical description of the colliding-particle motion in attractive potentials, under conditions such that the contribution of bound and quasibound states may be neglected.

Formation of vacancies in inner electron shells of fragments in nuclear fission of heavy elements

It has been found that if the order of asymmetry of the quasimolecule atoms formed M=ZH/ZL(1.65, correlation of the molecular orbitals (MO) occurs according to the MO correlation rules of weakly asymmetric quasimolecules. The formation of vacancies in the inner electron shells of fragments produced in the fission of 235U and 252Cf nuclei are considered on the basis of the MO correlation diagrams. The probability of vacancy formation in the L shell of the light fragments and the M shell of the heavy fragments proved to be almost unity.