PHOTOACOUSTIC OVERTONE SPECTROSCOPY OF PROPYNE
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Date
1991
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Publisher
Ohio State University
Abstract
The vibrational third overtone spectrum of the acetylenic C-H stretch of propyne was obtained by intracavity photoacoustic spectroscopy with a resolution limited by room temperature Doppler broadening and pressure broadening. Comparing the experimental spectrum with symmetric top simulation, it was found that all the peaks in the P and R branches match quite well within the measurement precision of $0.02cm^{-1}$ when J is larger than 10. However, for J less than 10, extra peaks appeared in the experimental spectrum. In addition, deviation of positions of peaks from simulation was found. A possible explanation is that the transitional upper state is perturbed. It was possible to assign all peaks. But some features of the spectrum have not yet been explained.
Description
Author Institution: Department of Chemistry, Indiana University