Cs and Oxygen Adsorption on Ge(001) and GaAs(001) Surfaces Studied by Metastable De-Excitation Spectroscopy

K. Yamada, S. Nishigaki () and M. Naitoh
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K. Yamada: Ishikawa National College of Technology, Tsubata, Ishikawa 929-03, Japan
S. Nishigaki: Kyushu Institute of Technology, Tobata, Kitakyushu 804, Japan
M. Naitoh: Kyushu Institute of Technology, Tobata, Kitakyushu 804, Japan

Surface Review and Letters (SRL), 1998, vol. 05, issue 01, 255-259

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(6\tilde{s})$mostly decreased, indicating direct transfer of6\tilde{s}$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 the6\tilde{s}$charge states measured by MDS.

Date: 1998
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DOI: 10.1142/S0218625X98000463

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