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Infrared Intensities for Degenerate Modes: The observed infrared intensity of a degenerate mode is the sum of the intensities of each degenerate component. A paper by Sørensen and Jørgensen [2] considers the doubly degenerate bending modes of linear molecules and shows that the overall intensity is the sum of the two individual components for the $\Gamma$ representation of IR intensities, and slightly less than this for the $S$ representation. Complaints in this paper about the poor quality of ab initio intensities are largely put to rest in a published comment by Gwaltney and Bartlett [3].

David Sherrill 2004-12-06