Experimental and theoretical investigations of single-electron capture andloss inHe+-Ar collisions

Abstract

Experimental and theoretical investigation of single-electron capture andadditional experimental studies of single-electron loss cross sections inHe+-Ar collisions at impact energies of 1.5-5.0 keV forexperimental studies and from 10 to 4000 keV for the theoreticalcalculations are presented. Comparisons are made with other experimentalresults, for single-electron capture the present measurements confirm thebehaviour observed by previous measurements in the energy range1.5-5.0 keV, except with the data of Eisele and Nagy (1977 J. Chem. Phys. 66 883-5), and for single-electron loss an extrapolation of thehigh-energy results to low energies shows good agreement with the presentdata, giving the general shape of the cross section curve. Our theoreticalcalculations are in good agreement with the experimental data andreproduce the main features of the cross section energy dependence. Wepresent the most important contributions to the total cross sections fromthe partial capture cross section to the He(1s) and He(n = 2) states, withthe former as the dominant channel over the energy region considered.