HIGH RESOLUTION SPECTROSCOPY OF JET-COOLED PROPYNE BY DIRECT INFRARED ABSORPTION
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Date
1984
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Ohio State University
Abstract
Direct absorption of an F-center laser beam in a pulsed free jet is used to measure the acetylenic C - H stretching spectra of propyne and acetylene. The use of a pulsed nozzle offers low temperatures (7 K to 50 K) and low background pressures $(10^{-5} Torr range)$ with modest pumping requirements. Resolution at - 100 MHz is better than Doppler limited. The jet-cooled spectra are compared to high resolution FTIR spectra of gas phase samples. At the lowest temperatures only the $K = 0$ and $K = 1$ levels, required by conservation of nuclear spin, are observed. The resolved splitting between these levels provides a value for the difference between ground state and vibrationally excited state rotational constants,$ A^{\prime} - A^{\prime\prime}$.
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Author Institution: Department of Chemistry, University of Rochester