Features of the angular distributions of accelerated multiply charged ions in oriented crystals

Abstract

Features that have been discovered recently in the transmission of multiply charged channeled ions with various energies through crystals are interpreted on the basis of kinetic theory. It is shown that the transition from “cooling” to “heating” of an isotropic beam of heavy multiply charged ions depends not only on the ion energy, but on the depth of their penetration into the crystal as well. The automodel character of the angular distribution of multiply charged ions transmitted through a thin oriented crystal is predicted. Agreement with experiment is achieved on the assumption that, at high ion energies, the probability of electron capture by a channeled ion decreases in comparison to the probability of electron loss. We also discuss the possibility of experimentally measuring the partial angular distributions and the dependence of the electron capture and loss probabilities on the transverse momentum and impact parameter for ions interacting with atomic chains.