Partial and total electronic stopping cross sections of atoms for a singly charged helium ion, (1)

Partial and total electronic stopping cross sections of atoms with Z (2≤Z≤54) for a He+ ion are tabulated and discussed on the basis of the wave-packet theory. The wave packet theory for the stopping of bound electrons has recently been developed. The main thrust of the wave packet theory is the use of momentum space representation to describe bound electrons, where the localized nature is held in the momentum distribution function. This theory yields the electronic stopping cross section of atoms and solids, and the energy-loss straggling of atoms for protons on the independent shell model. The aim of this report is to present tables of the partial and total electronic stopping cross sections for a He+ ion in collisions with neutral target atoms. In this method, the core electrons belonging to an atomic shell classified by (n, 1) (n: principal quantum number, 1: angular momentum quantum number) are considered to be identical. The ensemble of such identical electrons is regarded as a wave packet of a degenerate electron gas governed by the momentum occupation probability W(q) for momentum q. (N.K.)