Excimer formation as the relaxation of a nonlinear oscillator: Theory ofYstates

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Abstract
The existence of Y states in excimer-forming molecular crystals is addressed through a simple extension of an earlier model of the formation of excimers as occurring through the relaxation of a nonlinear oscillator. These Y states, which do not appear in solution, and have been observed in only some crystals, are intermediate states with partial excimeric character. Such states are shown to arise naturally in our model as a simple consequence of additional interactions that exist in the crystal, but not in solution, and to be associated with an abrupt (rather than gradual) transition as the strength of those interactions is varied.

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