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Vibrational redistribution in jet-cooled perylene intermediate coupling case

✍ Scribed by C. Bouzou; C. Jouvet; J.B. Leblond; Ph. Millie; A. Tramer; M. Sulkes

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 490 KB
Volume: 97
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(83)85008-8

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✦ Synopsis

Fluorescence escitation spectra (FES) and fluorescence spectra (FS) under single vibronic level escitation of perylene in a supersonic jet are reported. The fluorescence from the lowest vibrouic levels of the S1 state is purely resonant while for GEvib > 1600 cm-' broad-band emission spectra weakly dependent on uesc are explained by vibration-al rediitribution wih a characteristic time 5 < T,,d < 100 pr in the intermediate SEvib range (700-1600 cm-') complex emission spectra correspond to a strong coupling between the doorway state and a small number of "dark" states. The data are discussed in terms of a model assuming a rapid variation of the anharmonic coupling constant with the overall change of tire vibrational quantum number between interacting levels.

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