Vibrationally Resolved Study of the Fourth Photoelectron Band of Acetylene at 23.5 eV.
M. Carlsson Göthe, F.T. Chau, P.Baltzer, S. Svensson, B. Wannberg and L. Karlsson.
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 ν2(σ+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.
Read the publication here.