Abstract
The inner valence C 2Σ + g electronic state of the acetylene cation has been studied by means of ultraviolet photoelectron spectroscopy using HeII excitation. Vibrational structure is resolved and is interpreted in terms of a vibrational progression in the totally symmetric v 2(σ + g) mode. A Franck—Condon analysis has been carried out and force constants corresponding to the CH stretching, CC stretching and CHCC stretching interaction have been determined. The CH and CC bond lengths have been deduced and the values are found to be 1.088 ± 0.005 and 1.439 ± 0.005 Å, respectively.
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