Physics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confetc06b&link_type=abstract
"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec
Physics
Mini-Symposium: Fir/Thz Air/Space Missions
Scientific paper
Propionitrile (CH_3CH_2CN) is routinely observed with large column densities and at surprisingly high temperatures in hot core sources. The development of new, more sensitive observatories such as Herschel, ALMA and SOFIA have made it important to extend the laboratory data for propionitrile to coincide with the capabilities of the new instruments. In the present work, the laboratory measurements of the rotational spectrum of propionitrile have been extended to 1.6 THz. A global analysis of 4606 ground state transitions, which includes 2159 newly assigned transitions, has been fit to within experimental error to J=138, K=45, using both Watson A-reduced and Watson S-reduced Hamiltonians. The newly assigned transitions are primarily b-type, high K and very high J asymmetry split ^aR-branch transitions. The derived constants show a decided advantage of the Watson S-reduction in the analysis of this near-prolate (κ=0.96) asymmetric top. The spectrum and molecular constants will be presented. footnote
Brauer Carolyn S.
Drouin Brian J.
Pearson John C.
Yu Shanshan
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