Fine and Hyperfine Structure in Sub-Doppler Infrared, Ch-Stretching Spectra of Monodeuterated Methyl Radical

Details Fine and Hyperfine Structure in Sub-Doppler Infrared, Ch-Stretching Spectra of Monodeuterated Methyl Radical Fine and Hyperfine Structure in Sub-Doppler Infrared, Ch-Stretching Spectra of Monodeuterated Methyl Radical

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confetf06r&link_type=abstract

"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec

Computer Science

Radicals And Ions

Scientific paper

High resolution direct absorption spectroscopy in the CH-stretching region is used to observe fully resolved rovibrational structure and partially resolved fine and hyperfine structure of monodeuterated methyl radical (CH_{2}D). CH_{2}D is readily made by passing a mixture of CH_{2}DI and Ne/He through the orifice of a slit nozzle and striking a discharge, which supersonically expands to permit spectroscopic study of radicals with a rotational temperature of approximately 15 K and slit-narrowed IR line widths of 0.002 cm^{-1}. We obtained and analyzed rovibrational transitions in both the symmetric and antisymmetric CH-stretch regions. We also observed fine and hyperfine structure, arising from interactions between electron spin with molecular rotation and with H/D nuclear spins, respectively. This structure results in complex lineshapes under sub-Doppler resolution. Simultaneous least squares fitting of the set of spectral profiles is used to extract rotational, spin-rotation and Fermi contact information in the ground and vibrationally excited states.

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