${\mathrm{O}}^{\mathrm{-}}$ ions in front of a metal surface: Application to an O${(}^1$D${,}^1$S) quenching process

The interaction of ${\mathrm{O}}^{\mathrm{-}}$ ions with an Al surface is studied in the coupled-angular-mode method (CAM) to yield all the quantities relevant to study the O/${\mathrm{O}}^{\mathrm{-}}$-Al surface resonant-charge-transfer process. The present work takes into account the existence of a few equivalent electrons in the free O and ${\mathrm{O}}^{\mathrm{-}}$; this results in the fact that the O/${\mathrm{O}}^{\mathrm{-}}$ surface resonant-charge-transfer process does not only imply the O ground state but also the two metastable singlet states ${(}^1$D and ${}_{}{}^1{}_{}{}^{}$S). The CAM results are used to evaluate the importance of a quenching process in low-energy oxygen collisions with a metal surface. This process involves the formation of the ${\mathrm{O}}^{\mathrm{-}}$ ion as a transient intermediate.