Abstract
The dissociative adsorption of oxygen on Mo(001) has been studied using low energy (500–1000 eV) Li +, K + and He + ion scattering. Oxygen adsorption affects the energy and angular distributions of scattered ions, and also the intensity of scattered ions changes in a manner which is dependent upon the type of ion used. The scattered ion intensities are examined as a function of oxygen exposure and compared for each type of ion for the same surface structure and under identical scattering geometry. The He + intensity drops very sharply with increasing oxygen exposure, decreasing by a factor of 10 with ⩽ 2 L exposure for all azimuthal angles of incidence. The Li + intensity in all azimuths exhibits an initial decrease followed by a large increase and ultimately a decrease again as oxygen exposure increases. The K + intensity, while decreasing with exposure for incidence in the [100] azimuth, is relatively unaffected by low oxygen exposure in the [110] azimuth. These contrasting dependencies are discussed and explained as manifestations of different neutralization mechanisms occuring in each case.
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