COLOR-CENTER LASER SPECTRUM OF FLUOROBENZENE OBSERVED WITH THE PULSED SUPERSONIC JET EXPANSION TECHNIQUE
Publisher:
Ohio State UniversityAbstract:
The infrared spectrum of fluorobenzene in the CH-stretch region $(3040-3120 cm^{-1})$ has been observed with a color-center laser spectrometer combined with a pulsed supersonic jet expandion technique. Due to the rotational as well as cooling in the jet, well resolved rovibrational lines were recorded. At least 5 fundamental bands $(a_{1}; \nu_{2}, \nu_{13}, \nu_{20a} b_{1}; \nu_{7b}, \nu_{20b})$ are expected in this region according to the opto-thermal Raman conversion dye laser $spectroscopy^{a}$. So far two parallel bands $(v_{13} v_{20a})$ were analyzed to confirm the vibrational assignments given by the low-resolution spectroscopy. The rotational constants and band origins were derived from the observed spectra assuming those for ground state to the microwave $results^{b, c}$. The $\nu_{20\mu}$ band were found to be overlapped additionally with the two vibrational bands presumably caused by higher order Fermi interaction, whose inertia defects are small negative about $-0.5 amu{\AA}^{2}$. Their vibrational assignments are obscure yet, but the negative inatria defects imply that they include two or four quanta of low frequency out-of-plane vibrational modes such as $\nu_{11} (\omega = 248 cm^{-1})$ and $\nu_{16b} (498 cm^{-1})$.
Description:
$^{a}$ M. Scotoni, S. Oss, L. Lubich, S. Furlani, and D. Bassi, J. Chem. Phys. 103, 897 (1995) $^{b}$ M. Onda, H. Mukaida, and I. Yamaguchi. J. Mol. Spectrosc. 176, 146 (1996) $^{c}$ L. Nygaard, I. Bojesem, T. Pedersen, and J.R. Andersen. J. Mol. Struct. 2, 209 (1968)
Author Institution: Department of Chemistry, Faculty of Science Kyushu University
Author Institution: Department of Chemistry, Faculty of Science Kyushu University
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