SUB-DOPPLER HIGH RESOLUTION EXCITATION SPECTROSCOPY OF DIBENZO-P-DIOXIN

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2004

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Ohio State University

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Sub-Doppler high-resolution fluorescence excitation spectra of the $S_{1} \leftarrow S_{0}$ transition of dibenzo-p-dioxin (DD) have been observed in a collimated molecular beam.$^{a}$ The rotational constants in both the $S_{0}$ and $S_{1}$ states were determined by analysis of the observed rotational contours. The DD molecule has shown to be planar in the $S_{0}$ state and folded slightly out-of-plane (butterfly form) in the $S_{1}$ state. The observed line widths were about $0.01 cm^{-1}$, which were much larger than the instrumental resolution $(0.001 cm^{-1})$. The lifetime of the $S_{1}$ state was evaluated to be about 500 ps.

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$^{a}$M. Baba, A. Doi, Y. Tatamitani, S. Kasahara, and H. Kat\^{o}, J. Phys. Chem. A, 108, 1388 (2004)
Author Institution: Graduate School of Science, Kyoto University; Molecular Photoscience Research Center, Kobe University

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