Mode-dependent intramolecular vibrational redistribution in the S1 state of jet-cooled p -difluorobenzene

Masaaki Fujii, Takayuki Ebata, Naohiki Mikami, Mitsuo Ito, Scott H. Kable, Warren D. Lawrance, Terrence B. Parsons, Alan E.W. Knight

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Fluorescence spectra of p-difluorobenzene cooled in supersonic expansions have been measured following laser excitation of a variety of discrete absorption features in the S1-S0 transition. The spectra reveal that the onset for S1 state mixing, as gauged from the fraction of unstructured emission in the dispersed fluorescence, occurs in the vicinity of εvib ∼ 1200 cm-1. Estimates of the fraction of unstructured emission from emitting levels containing excitation in the out-of-plane mode v30 indicate that state mixing is more advanced for these levels, as has been concluded previously from dispersed fluorescence studies of p-difluorobenzene at 300 K. Comparisons between the 300 K data and the results obtained for jet-cooled p-difluorobenzene support the view that rotation-vibration state mixing contributes to the intramolecular redistribution of vibrational energy in regions of low-to-medium vibrational state densities.

Original languageEnglish
Pages (from-to)2937-2940
Number of pages4
JournalJournal of Physical Chemistry
Issue number14
Publication statusPublished - 1 Jul 1984
Externally publishedYes


Dive into the research topics of 'Mode-dependent intramolecular vibrational redistribution in the S1 state of jet-cooled p -difluorobenzene'. Together they form a unique fingerprint.

Cite this