Intramolecular non-radiative relaxation from the first excited singlet background manifolds of anthracene and 9,10-dichloroanthracene in partially jet-cooled states

Hiromichi Niikura, Urs Graf, Satoshi Hirayama

Research output: Contribution to journalArticle

6 Citations (Scopus)


The absorption and fluorescence excitation spectra of anthracene (A) and 9,10-dichloroanthracene (DCLA) were measured simultaneously under various cooling conditions by using the technique of supersonic expansion. The sequence bands observed mostly on the red side of each single vibronic level at low stagnation pressures were ascribed to the transition to the S1 background manifolds. The fluorescence quantum yields for these bands were estimated from the relative intensities of the absorption and fluorescence excitation spectra at their band peaks. The radiationless process was found to be enhanced by non-totally symmetric vibrational modes in the S1 background manifolds with low excess energies.

Original languageEnglish
Pages (from-to)217-222
Number of pages6
JournalChemical Physics Letters
Issue number1-2
Publication statusPublished - 1997 Feb 21
Externally publishedYes


ASJC Scopus subject areas

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

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