Abstract
At temperatures lower than 52 K, ethylene condenses on Pt(111). Valence-band analysis shows that the first layer and the condensed phase exhibit almost the same positions of the molecular orbitals. Carbon K-shell excitation leads to the appearance of π∗ and σ∗ resonances from which it is deduced that the low temperature ethylene monolayer is π-bonded to the substrate with minor C-C elongation, namely about 0.004 nm. A comparison is made with C-C bond lengths of ethylene monolayers and multilayers measured using NEXAFS on various substrates and given in the literature. It shows that they correlate nicely with the values of the πσ parameter deduced from HREELS results for the same monolayers.
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