Ethylene π species on bare and cesiated Pt(111) surfaces

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Abstract
The adsorption of ethylene on bare and cesiated Pt(111) surfaces has been investigated by means of thermal desorption spectroscopy and ultraviolet photoemission spectroscopy, at temperatures ranging between 37 and 800 K. On the bare Pt(111) surface, a new π-bonded C2H4 species has been observed at T52 K, it transforms into di-σ C2H4 and then into ethylidyne (∼300 K). Conversely, cesium preadsoption gives rise to reversibly adsorbed π-bonded ethylene, meanwhile it inhibits the usual reaction path (di-σ species leading to ethylidyne). Furthermore, valence-level binding energy shifts induced by cesium adatoms have been shown to be consistent with the theoretical picture of the electrostatic potential surrounding adsorbed alkali elements.

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