The radiative Auger emission (RAE) from 0.94–6.25-MeV/u ${}_{16}{}^{}{}_{}{}^{}\mathrm{S}_{}^{13+}{}_{}{}^{}$ (lithiumlike) projectiles excited in collisions with He target atoms has been measured. For these highly stripped ions the intensity of RAE photons relative to Kα x-ray emission is enhanced by about a factor of five compared with theoretical calculations and an earlier experimental measurement for S ions with few electron vacancies. The enhancement of RAE for ${\mathrm{S}}^{13+}$ is qualitatively similar to results reported previously for lithiumlike ${}_{23}{}^{}{}_{}{}^{}\mathrm{V}_{}^{20+}{}_{}{}^{}$; however, some differences between S and V are evident.

• Received 6 October 1989

DOI:https://doi.org/10.1103/PhysRevA.41.2594