ROTATIONALLY RESOLVED FLUORESCENCE EXCITATION SPECTRUM OF 1-NAPHTHOIC ACID
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Date
1992
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Ohio State University
Abstract
The $S_{1}\leftarrow S_{0}$ electronic spectrum of 1-naphthoic acid has been observed by FE spectroscopy in supersonic jets and in molecular beams. The jet spectra reveal a progression in a low frequency mode that is assigned to the carboxyl torsion with respect to the ring. In the molecular beam experiments, the members of this progression were rotationally resolved using a high resolution CW laser. Analyses of these spectra yield the band origins, the transition moments, and the rotational constants of the ground and the excited electronic states involved in the transition. By similar studies on carboxyl deuterated 1-naphthoic acid, it has been established that the syn-isomer gives rise to the observed spectra. The carboxyl torsion is modelled with an asymmetric double-well potential, and from the observed torsional frequencies, the barrier height for the syn-trans motion has been calculated for both the ground and excited electronic states.
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Author Institution: Department of Chemistry, University of Pittsburgh