dc.creator Lombardi, John R. en_US dc.creator Hartford, Allen en_US dc.date.accessioned 2006-06-15T16:53:34Z dc.date.available 2006-06-15T16:53:34Z dc.date.issued 1969 en_US dc.identifier 1969-S-12 en_US dc.identifier.uri http://hdl.handle.net/1811/15827 dc.description Author Institution: The William Albert Noyes Laboratory Department of Chemistry, University of Illinois en_US dc.description.abstract The 0-0 band of the $\pi^{\ast} \leftarrow \pi$ transition of thionaphthene at $2936\AA$ was recorded using an 8-meter Czerny mount spectrometer with a resolving power of approximately 500,000 and a linear dispersion on the order of $1 cm/{\AA}$. The main features of the spectrum include Q and P sub-bands and two intense maxima. Using computer simulation techniques it has been possible to determine the excited state rotational constants to a high degree of accuracy and to demonstrate conclusively the hybrid character of the band. The latter yields the direction of the transition moment. Using ground state rotational constants of $A"" = 0.104335 cm^{-1}, B"" = 0.042772 cm^{-1}$ and $C"" = 0.030336 cm^{-1}$ as determined from assumed bond angles and lengths, the excited state values obtained from the best fit of computed with experimental contour are $A^{\prime} = 0.100182 cm^{-1}, B^{\prime} = 0.042157 cm^{-1}$ and $C^{\prime} = 0.029671 cm^{-1}$. The prominent peak approximately $3 cm^{-1}$ to the blue of the main peak cannot be fit by pure A-type computation and is found to result from a B-type contribution, while most of the rotational fine structure is due to an A-type band. Mixing of various amounts of A-type and B-type character yields the direction of the transition moment. en_US dc.format.extent 168768 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title THE ELECTRONIC ABSORPTION SPECTRUM OF THE 0-0 BAND OF THIONAPHTHENE. en_US dc.type article en_US
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