Computer Science
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confetc07b&link_type=abstract
"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec
Computer Science
Mini-Symposium: Fir/Thz Air/Space Missions
Scientific paper
Propionitrile (CH_3CH_2CN) is observed with large column densities in a number of high-mass star-forming cores, where core temperatures exceed 200 K. It is a near-prolate (κ=0.96) asymmetric top with appreciable dipole moment components on both the a- and b-axes (μ_a = 3.84 D, μ_b = 1.23 D). This, combined with the presence of four fundamental modes as well as four overtones and combination bands all occurring below 600 cm^{-1}, results in a very rich spectrum. It is known to be a major contributor to spectral line confusion in ground-based observations and is expected to complicate observations by Herschel, SOFIA and ALMA, making it imperative to fully characterize the entire spectrum. The lowest in-plane bend, ν_{13}, is 206.9(0.5) cm^{-1}, and the first excited torsional state, ν_{21}, which is just 186 GHz above, have been detected in hot cores with antenna temperatures of a few Kelvin. The close proximity of ν_{13} and ν_{21}, as well as their low-lying nature, offers a unique opportunity to study the vibration-torsion-rotation coupling problem in the case of two nearly degenerate vibrational states. As expected from C_s symmetry and their A^' and A^'' nature, these states exhibit strong a- and b-symmetry Coriolis interactions, as well as interactions resulting from different sets of Eckhart-Sayvetz conditions being required in ν_{13} and ν_{21}. In the present work, the ν_{13} and ν_{21} states of propionitrile have been analyzed to high frequency and angular momentum quantum number. The spectrum, molecular constants,and insights into the vibration-torsion-rotation problem will be discussed.
H. M. Heise, H. Lutz & H. Dreizler,Z.Nat.,29a,1345 (1974).
H. M. Heise, F. Winther & H. Lutz,J. Mol. Spectrosc.,90,531 (1981).
D. M. Mehringer, J. C. Pearson, J. Keene & T. G. Phillips,Ap.J.,608,306 (2004).
Brauer Carolyn S.
Drouin Brian J.
Pearson John C.
Yu Shanshan
No associations
LandOfFree
Analysis of the Lowest In-Plane Bend and First Excited Torsional State of CH_3CH_2CN does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Analysis of the Lowest In-Plane Bend and First Excited Torsional State of CH_3CH_2CN, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analysis of the Lowest In-Plane Bend and First Excited Torsional State of CH_3CH_2CN will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1642224