Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confetj07a&link_type=abstract
"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec
Astronomy and Astrophysics
Astronomy
Astronomical Species And Processes
Scientific paper
In interstellar carbon chemistry, CH_3^+ is thought to be an important and abundant molecular ion. However, as it is a symmetric planar molecule and, as a result, it has no permanent dipole moment, it is almost impossible to detect this species by radio astronomical observations. Its deuterated species, CH_2D^+ and CHD_2^+, possess the dipole moment, so the rotational lines should be observable. Rösslein et al. and Jagod et al. observed the infrared spectra of these deuterated species. Demuynck and coworkers tried to observe CH_2D^+ rotational lines in an extended negative glow discharge with no success. More recently Lis et al. reported tentative identification of CH_2D^+ toward Ori IRc2. The molecular constants and the predicted rotational transition frequencies given by Röslein et al. were a good starting point in searching for the rotational lines. A very weak feature was found almost exactly at the calculated frequency for the 212-111 transition. Eventually the line appeared stronger enough for precise frequency measurements, after adjusting the reaction conditions. The optimum gas mixture was found to be CH_4 (˜ 3 mTorr), CD_4 (˜ 1 mTorr), H_2 (˜ 2 mTorr), and He (˜ 35 mTorr). It is interesting to note that helium is essential to produce CH_2D^+. No signals were detectable with Ar buffer.
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