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Inelastic helium-scattering measurements have been used to investigate the influence of oxygen adsorption on the Pt(111) surface phonons. Oxygen was found to form a (1×{}1) overlayer with nearly unity coverage at elevated surface temperatures. Such an overlayer is shown to induce a remarkable softening of the Pt surface phonons, which is interpreted as a reduction in the Pt attractive interaction arising from sp-electron donation to the oxygen overlayer.
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Neuhaus et al. (1987) studied this question.
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