Theory of the ionization of ethane

Abstract
Ab initio molecular orbital studies on C2H6 + support an assignment of 2 A 1g (D 3d point group symmetry) for the ground state of this cation. This differs from the prediction of Koopmans' theorem which suggests a 2 Eg state for vertical ionization. Approximate force constants and vibrational frequencies are calculated for the ethane cation in the 2 A 1g state and are found to be consistent with the vibrational progression observed in the experimental photoelectron spectrum.

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