Abstract
The inner valence C 2?+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 ?2(?+g) mode. A Franck-Condon analysis has been carried out and force constants corresponding to the CH stretching, CC stretching and CH-CC 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 Å and 1.439 ± 0.005 Å, respectively.
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