Electron excitation and capture inF8+plus Ne collisions

Abstract

$K$ x-ray spectra from the nearly symmetric collision system ${\mathrm{F}}^{8+}$ plus Ne were obtained over the bombarding energy range from 10 to 40 MeV with sufficient spectral resolution to observe separately the $K$ x-ray transitions from states formed by $K$-shell electron excitation and electron capture to excited states of fluorine. The cross sections for the two processes were obtained by normalization to total $K$ x-ray production cross sections. The $K$ x-ray production cross section for electron capture to excited states falls off by a factor of 40 over the energy range of 10 to 40 MeV, and the $K$-shell electron excitation cross section increases by a factor of 4 over the energy range 20 to 40 MeV. The $K$-shell excitation cross section has an energy dependence quite different from that observed for the asymmetric systems.