*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 representation
of IR intensities, and slightly less than this for the 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