ULTRAHIGH-RESOLUTION SPECTROSCOPY OF DIBENZOFURAN $S_{1} \leftarrow S_{0}$ TRANSITION
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Date
2007
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Publisher
Ohio State University
Abstract
Dibenzofuran is one of the prototypical molecule of toxic dioxins and it is great important to investigate the excited-state dynamics. We have observed low-resolution spectra for the vibronic structure of the $S_1 \;^1A_1 \leftarrow S_0 \;^1A_1$ transition of jet-cooled dibenzofuran. Several vibronic bands are stronger than the 0$_0^0$ band. These bands are found to be the $A$-type transition which are enhanced by intensity borrowing through the vibronic coupling with the $S_2 \;^1B_2$ state. } {\bf 110}, 10000 (2006).} Rotationally resolved ultrahigh-resolution spectra of jet-cooled dibenzofuran for the 0$_0^0$ and 0$_0^0$+443 cm$^{-1}$ band have been observed. Several thousand lines were assigned and these molecular constants were determined. }, {\bf 238}, 49 (2006).} We have extended the high-resolution spectroscopic measurement for several vibronic bands up to 1335 cm$^{-1}$. We analyzed observed rotational lines and determined the molecular constants for each vibronic bands. The Zeeman broadenings of the rotational lines were also observed, and the $J$, $K$-dependence were studied. As a result, the observed Zeeman effects could be explained to be originating from the magnetic moment of the $S_{1} \;^1A_1$ state induced by mixing with $S_2 \;^1B_2$ state by $J$-$L$ coupling.
Description
Author Institution: Molecular Photoscience Research Center, Kobe University, Kobe; 657-8501, Japan; Graduate School of Science, Kyoto University, Kyoto; 606-8502, Japan