A model two-dimensional potential for internal rotation of 9-methylanthracene studied by electronic spectroscopy and DFT calculations

Masayuki Nakagaki, Eriko Nishi, Kenji Sakota, Haruyuki Nakano, Hiroshi Sekiya

Research output: Contribution to journalArticle

7 Citations (Scopus)


The S1-S0 fluorescence excitation and dispersed fluorescence spectra of 9-methylanthracene are measured in a supersonic free jet expansion. Several low-frequency bands assigned to the transitions between the internal rotational levels of the methyl group can not be fitted to the calculated energy levels obtained by the one-dimensional rotor model. We have introduced a two-dimensional model incorporating the coupling of the methyl rotation and an out-of-plane bending motion of the anthracene ring. The calculations based on this model reproduce the intensity distributions in the fluorescence excitation and dispersed fluorescence spectra as well as the frequencies of the internal rotational levels in the S0 and S1 state.

Original languageEnglish
Pages (from-to)190-196
Number of pages7
JournalChemical Physics
Issue number1-3
Publication statusPublished - Sep 29 2006


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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