Inelastic Processes inNe+andAr+Collisions with Mg and Y Surfaces Leading to Scattered-Ion Fractions and Vacuum-Ultraviolet Photon Emission

Collisions of kiloelectronvolt ${\mathrm{Ne}}^{+}$ on Mg and ${\mathrm{Ar}}^{+}$ on Y yield scattered-ion fractions as high as 70% and 38%, respectively, and ${}_{}{}^{1,3}{}_{}{}^{}P\to {}_{}{}^1{}_{}{}^{}S$ resonance radiation from the excited neutral projectile atoms in the vacuum-ultraviolet range 30-200 nm. These data, along with those from the oxidized and hydroxylated surfaces, show that electron promotions within the molecular orbitals of the quasidiatomic molecule formed during the close encounter are a significant, if not dominating, process in kiloelectronvolt ion-surface collisions.