Adiabatic asymptotic theory of the two-electron exchange at relativistic binding energies

Abstract

An asymptotic (over a large internuclear distance) theory of two-electron exchange in collision of a multielectron atom and multiply charged ion is constructed. In the framework of the quasirelativistic Dirac-Breit approximation the matrix element of two-electron exchange interaction is analytically calculated. This approach allows to take into account the relativistic effects connected with the magnetic and retardation interelectron interactions. In the nonrelativistic limit the matrix element obtained proceeds to the result of paper [M.I. Karbovanets, V.Yu. Lazur, M.I. Chibisov, Zh. Eksp. Teor. Fiz., 84 (1984)].