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

Joel M. Friedman, Robin M. Hochstrasser

Research output: Contribution to journalArticle

34 Citations (Scopus)

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 - 1974
Externally publishedYes

Fingerprint

azulene
high resolution
Helium
naphthalene
Lasers
Observability
Excited states
Electron energy levels
Ground state
Photons
Ions
Crystalline materials
Crystals
pellets
progressions
excitation
lasers
line spectra
vibration mode
helium

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Moderately high resolution fluorecence spectrum of the S1 → S0 transition of azulene. / Friedman, Joel M.; Hochstrasser, Robin M.

In: Chemical Physics, Vol. 6, No. 2, 1974, p. 145-154.

Research output: Contribution to journalArticle

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