Atom abstraction in the scattering of state-selected NO+ (X-1 Sigma(+)) onO/Al(111)

reactive scattering of state-selected NO+(X(1)Sigma(+)) on oxygen-covered A l(111) is explored at hyperthermal collision energies. Relative ion yields and mean translational energies of scattered NO2- are presented as a functi on of oxygen exposure and NO+ collision energy. Above the 9 +/- 1 eV thresh old for reaction, NO2- products emerge with an average kinetic energy that depends linearly on incident NO+ energy. The formation of NO2- is assigned to the direct, Eley-Rideal abstraction of an adsorbed O atom by an incident NO molecule.