Abstract
It is shown that by takin into account anhormonicity it is possible to explain why, in ground-to-excimer absorption in pyrene, the non-phonon peak can be resolved whereas the other peaks are overlapped. The same treatment applied to emission gives an explanation of the lack of structure in excimer emission. A possible model for vibrational relaxation of the excimer in pyrene crystal is considered and the corresponding time for relaxation is estimated.
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