Inner-shell Coulomb excitation in the collisions of few-electron F withH2and He

Abstract

The magnitudes, velocity dependences, and $Z$ dependence of projectile $K$ x-ray cross sections measured for 20-56-MeV ${\mathrm{F}}^{7+,8+}$ incident on ${\mathrm{H}}_2$ and He are well reproduced by direct Coulomb excitation theories, in contrast with previous evidence for multistep excitation processes.