Abstract
The room temperature adsorption of CF 3COOH, CH 3COOH and CO on cleaved GaAs(110) surfaces has been studied by vibrational electron energy loss spectroscopy (HRELS), second derivative electron energy spectroscopy (ELS) and electron diffraction (LEED). CO does not adsorb on the GaAs surfaces in measurable quantities. Acetic acid CH 3COOH is dissociatively adsorbed as an acetate bonded to Ga surface atoms with the split-off hydrogen on As surface atoms. The fluorated acid CF 3COOH decomposes via an acetate intermediate CF 3COO into active CF 3 groups which adsorb on Ga surface atoms. The split-off hydrogen sticks to surface As atoms while the generated CO 2 desorbs. The adsorption models are consistent with the LEED c(2×2) superstructure observed after saturated adsorption of both acids.
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