Large molecule relaxation: Spectroscopy, structure, and vibrational energy redistribution in naphthazarin

P. M. Rentzepis, V. E. Bondybey

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Analysis of IR and laser induced fluorescence spectra of naphthazarin in rare gas matrices shows clearly that its vibrational potential is characterized by well localized, deep, C2v potential minima. Fluorescence quantum yield in the deuterated molecule is nearly an order of magnitude higher than the H2 and HD isotopic species. Vibrational relaxation in the upper state is remarkably slow and intense unrelaxed emission from a large number of excited vibrational levels is observed. Studies of the unrelaxed emission provide insight into the vibrational relaxation process. Vibrational energy redistribution clearly proceeds via specific pathways and not in a random, statistical manner. The relaxation rates and pathways exhibit only a mild dependence upon temperature and upon the matrix medium.

Original languageEnglish
Pages (from-to)4727-4737
Number of pages11
JournalJournal of Chemical Physics
Volume80
Issue number10
DOIs
StatePublished - 1984
Externally publishedYes

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