HIGH RESOLUTION NEAR INFRARED SPECTRA OF THE CH STRETCHING MODES IN JET COOLED ETHYL RADICAL
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Date
1997
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Ohio State University
Abstract
High resolution near infrared spectra of the symmetric and anti-symmetric $CH_{2}$ stretch of the ethyl radical, $C_{2}H_{5}$, is recorded and analyzed. The radical is created in a glow discharge, slit supersonic expansion. Effecient rotational cooling $(T_{rot} 14 K)$ simplifies the spectra, premitting accurate determination of both ground and vibrationally excited state rotational constants. Furthermore, detailed analysis of the spectra in terms of a rigid top-rigid frame Hamiltonian yields detailed information about the ethyl potential surface, in particular, shedding light on the equilibrium geometry and the magnitude of barriers to internal $CH_{2}-CH_{3}$ rotation.
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Author Institution: JILA, National Institute of Standards and Technology und Department of Chemistry and Biochemistry, University of Colorado