Sub-Doppler high-resolution excitation spectroscopy of the S1 ← S0 transition of dibenzofuran |
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Authors: | Michiru Yamawaki Atsushi Doi Masaaki Baba |
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Institution: | a Molecular Photoscience Research Center, Kobe University, Nada-ku, Kobe 657-8501, Japan b Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan |
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Abstract: | Rotationally resolved ultrahigh-resolution fluorescence excitation spectra of the S1 ← S0 transition of dibenzofuran have been observed using the technique of crossing a collimated molecular beam and the single-mode UV laser beam. 3291 rotational lines of the band and 3047 rotational lines of the ![View the MathML source View the MathML source](http://ars.els-cdn.com/content/image/1-s2.0-S0022285206001111-si25.gif) band have been assigned. The band has been found to be a b-type transition, in which the transition moment is along the twofold symmetry axis of this molecule, and only the ΔKa = ± 1 transitions were observed. The excited state is identified to be the S11A1(ππ∗) state. In contrast with this, the ![View the MathML source View the MathML source](http://ars.els-cdn.com/content/image/1-s2.0-S0022285206001111-si28.gif) band has been found to be an a-type transition in which the transition moment is along the long axis in plane. It indicates that the intensity of this vibronic band arises from vibronic coupling with the S21B2(ππ∗) state. We determined the accurate rotational constants and the molecule have been shown to be planar both in the ground and excited states. |
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Keywords: | Ultrahigh-resolution laser spectroscopy Dibenzofuran A collimated molecular beam Vibronic coupling Rotational constants |
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