Starting from an established correlation between the σ shape resonance position in nearedge x-ray-absorption fine-structure spectra and the intramolecular C-C bond length for gas-phase hydrocarbons, we derive a similar relation for chemisorbed molecules. The linear relation obtained allows us to determine the C-C bond length for chemisorbed molecules from near-edge x-ray-absorption fine-structure spectra with a ruler to an accuracy of 0.04 {}. Examples are given for bonding and bond-length changes of C₂{H}₂$ and ${C}₂H₄ on Pt(111).
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Stöhr et al. (1984) studied this question.
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