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# COLOR-CENTER LASER SPECTRUM OF THIOPHENE OBSERVED WITH THE PULSED SUPERSONIC JET EXPANSION TECHNIQUE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/19405

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 Title: COLOR-CENTER LASER SPECTRUM OF THIOPHENE OBSERVED WITH THE PULSED SUPERSONIC JET EXPANSION TECHNIQUE Creators: Okumura, Akihito; Ishiguro, M.; Tanaka, Keiichi; Tanaka, Takehiko Issue Date: 1999 Abstract: The high resolution infrared spectrum of thiophene in the CH-stretch region $(3070-3140 cm^{-1})$ has been observed with a color-center laser spectrometer combined with a pulsed supersonic jet expandion technique. Of 4 fundamental bands $(a_{1}; \nu_{1}, \nu_{2}, b_{1}; \nu_{12}, \nu_{13})$ expected in this region, the $\nu_{2}$ band was analyzed to the confirmation of previous vibrational $assignment.^{a b}$ The rotational constants and band origin were derived from the observed spectra while the ground state constants were fixed at the microwave $values.^{c}$ The $\nu_{2}$ band was found to be overlapped by an $a_{1}$ vibrational band, which is denoted as $\nu_{x}$. The $\nu_{x}$ band presumably borrows the intensity from the $\nu_{2}$ band by Fermi resonance. The vibrational assignment of $\nu_{x}$ is not get clear, but the magnitude of the interaction between the $\nu_{2}$ and $\nu_{x}$ states is calculated to be $0.8 cm^{-1}$ from the analysis of the intensity ratio of these bands. URI: http://hdl.handle.net/1811/19405 Other Identifiers: 1999-RJ-01