Vibronically Induced Absorption of Forbidden Infrared Transitions

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Abstract
The usual selection rules governing the appearance of infrared fundamental frequencies in absorption are found to break down in the case that the molecule is in a degenerate electronic state capable of other vibronic interactions such as the Jahn-Teller effect. The intensity of such forbidden transitions is discussed and the conclusion reached that absorption is too weak to be observed except in such cases that the Jahn-Teller effect has produced sufficient distortion to destroy the symmetry of the original configuration and remove the electronic degeneracy; and under such conditions the previously ``forbidden'' transitions always become allowed by normal considerations for the nondegenerate electronic state of the molecule in the distorted configuration.

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