THz Spectroscopy of H_2D^+

Details THz Spectroscopy of H_2D^+ THz Spectroscopy of H_2D^+

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confetc04m&link_type=abstract

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

Astronomy and Astrophysics

Astrophysics

Mini-Symposium: Fir/Thz Air/Space Missions

Scientific paper

The pure rotational transition frequencies of H_2D^+, 2_{12}← 1_{11}, 2_{02}← 1_{01}, 2_{11}← 1_{10}, and 3_{13}← 2_{12}, have been measured in the laboratory precisely by using a tunable far-infrared spectrometer. Among them, the 2_{12}← 1_{11} line was recently detected in space toward Sgr B2 by Cernicharo et al.^a. Their identification was made based on a calculated line frequency estimated from the spectroscopic data of Amano and Hirao^b. It has been found that our measured frequency of this line, 2363242.82(69) MHz, is lower by about 20 MHz than the estimated value. All the available THz lines and known millimeter- and submillimeter-wave lines together with the combination differences derived from the infrared transitions are fitted to the Watson effective Hamiltonian. A set of improved molecular constants are obtained. ---------- ^aJ.Cernicharo, E. Polehampton, and J.R. Goicoechea. Astrophys. J., 657, L21-L24 (2007). ^bT. Amano and T. Hirao, J. Mol. Spectrosc., 233, 7-14 (2005).

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