title: Vibronic structure in the S1-S0 transition of jet-cooled dibenzofuran.
abstract: Fluorescence excitation spectra of dibenzofuran in a supersonic jet are observed and the vibronic structure is analyzed for the S(1) (1)A(1) (pipi) and S(0) states. An observation of the rotational envelopes reveals that the band is a B-type band. However, it is shown that most of the strong vibronic bands are A-type bands. The intensity arises from vibronic coupling with the S(2) (1)B(2) state. We find a broad emission in the dispersed fluorescence spectrum for the excitation of the high vibrational levels in the S(1) state. This indicates that intramolecular vibrational redistribution (IVR) occurs efficiently in the isolated dibenzofuran molecule.
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan. baba@kuchem.kyoto-u.ac.jp
authors.forename: Masaaki
authors.initials: M
authors.lastname: Baba
authors.forename: Koichi
authors.initials: K
authors.lastname: Mori
authors.forename: Michiru
authors.initials: M
authors.lastname: Yamawaki
authors.forename: Kumi
authors.initials: K
authors.lastname: Akita
authors.forename: Masahide
authors.initials: M
authors.lastname: Ito
authors.forename: Shunji
authors.initials: S
authors.lastname: Kasahara
authors.forename: Takaya
authors.initials: T
authors.lastname: Yamanaka