Nonadiabatic rate processes on metal surface: Limitation by spin conversion

Rate processes occurring on a metal surface may sometimes be limited by spin conversion. We present a generic model describing this case. The results obtained are compared with the conventional two-state Landau-Zener model and with a multistate model implying one-electron transfer between the reactant and the metal. In this context, the specifics of the dissociative adsorption of O2 on Ag(111) are briefly discussed