Abstract
Metastable de-excitation spectroscopy (MDS) has been employed to elucidate the local electronic structure of oxygen plus alkali metal (Cs) coadsorbed layers on Ge(001)-(2×1) and GaAs(001)-(4×2) surfaces. Upon admission of oxygen at about 0.05–0.6 L, the MDS emission intensity due to Cs 6s-induced states [Formula: see text] mostly decreased, indicating direct transfer of [Formula: see text] electrons to oxygen. This initial step is followed by a steady process of substrate oxidation irrelevant to alkali charge transfer. Alkali-promoted oxygen uptake processes are discussed in connection with substrate-dependent variations in the [Formula: see text] charge states measured by MDS.
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