Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..conferh14k&link_type=abstract
"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec
Astronomy and Astrophysics
Astrophysics
Microwave (Rotational)
Scientific paper
The rotational spectrum of phenylacetylene, C_6H_5-CequivC-H, has hitherto only been studied in the centimeter-wave region, at room-temperature, and in supersonic expansion. There appears to be continuing astrophysical interest in polar species closely related to benzene and we decided to extend the knowledge of the laboratory spectrum of phenylacetylene up to the submillimeter-wave region. We report extensive measurements of the room-temperature spectrum at frequencies from 90 to 340 GHz. Precise spectroscopic constants are determined for the ground state, and the two lowest excited vibrational states: v24=1 and v36=1.
The two excited states belong to the out-of-plane and the in-plane C-CequivC bending modes, and are very strongly coupled by an a-axis Coriolis interaction. It was, nevertheless, possible to successfully fit the measured transitions with a minimal number of interaction constants. The present results from rotational spectroscopy are compared with previous normal mode analyses for phenylacetylene and with additional anharmonic force field calculations carried out in this work.
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H.Dreizler, H.D.Rudolph, B.Hartke, J. Mol. Struct., 698, 1-24 (2004).
Kisiel Zbigniew
Kra'Snicki Adam
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