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

Author

Listed:
  • 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)

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.

Suggested Citation

  • K. Yamada & S. Nishigaki & M. Naitoh, 1998. "Cs and Oxygen Adsorption on Ge(001) and GaAs(001) Surfaces Studied by Metastable De-Excitation Spectroscopy," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 5(01), pages 255-259.
    • Handle: RePEc:wsi:srlxxx:v:05:y:1998:i:01:n:s0218625x98000463
    DOI: 10.1142/S0218625X98000463
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