Moderately high resolution fluorecence spectrum of the S1 → S0 transition of azulene

Joel M. Friedman, Robin M. Hochstrasser

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

We report an Ar/Kr ion laser induced spectrally resolved S1 → S0 emission from an azulene in a host naphthalene crystal observed at the helium λ-point and at 77 K. Less well resolved S1 → S0 emission from crystalline azulene dispersed in a KBr pellet at 300 K is also reported. For the 6471 Å excitation the emission from the azulene in naphthalene system is analyzed in terms of three components: a resonance enhanced Raman emission originating from a nonstationary laser photon energy state 800 cm-1 above the S1 origin, a partially relaxed fluorecence originating from the 665 cm-1 vibrational level of S1 and a totally relaxed fluorecence from the S1 origin (14651 cm-1). The interpretation of the spectral lines is based on totally symetric vibrational modes (406, 679, 825,902, 1203, 1269, 1401, and 1586 cm-1) the most prominent of which is the progression forming 825 cm-1 mode. On the basis of both energies and intensities, correlations are made between ground and excited state vibrations and are compared with earlier results. Based on our results, a discussion is given on a plausible relaxation scheme for our system including the influence of Franck-Condon factors on the observability of unrelaxed emission.

Original languageEnglish (US)
Pages (from-to)145-154
Number of pages10
JournalChemical Physics
Volume6
Issue number2
DOIs
StatePublished - Nov 1974
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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