Issue |
A&A
Volume 516, June-July 2010
|
|
---|---|---|
Article Number | L3 | |
Number of page(s) | 2 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361/201014877 | |
Published online | 22 June 2010 |
Letter to the Editor
Rotational transitions of CH2D+ determined by high-resolution IR spectroscopy
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany e-mail: asvany@ph1.uni-koeln.de
Received:
28
April
2010
Accepted:
10
May
2010
Context. Deuterated forms of CH are responsible for deuterium
fractionation in warmer environments. Current searches for CH2D+ are
hampered by a lack of accurate laboratory data.
Aims. We demonstrate that IR spectroscopy at very high resolution can make accurate rotational predictions.
Methods. By combining a low-temperature ion trap with a narrow-bandwidth IR light source, we are able to measure vibrational transitions with high accuracy. A subsequent fit using an asymmetric rotor model allows predictions of MHz accuracy or even better.
Results. We predict rotational transitions up to 1.5 THz.
Key words: methods: laboratory / ISM: molecules / submillimeter: ISM
© ESO, 2010
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