Taking into account relativistic effects in the two-electron exchange in slow ion-atomic collisions

Abstract

An asymptotic (over a large internuclear distance) theory of two-electron exchange at collision of multielectron atom and multiply charged ion. 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., V. 86, P. 84 (1984)].