Volume 527, March 2011
|Number of page(s)||4|
|Published online||26 January 2011|
Terahertz spectroscopy of the CHD radical ()
Department of Environmental ScienceFaculty of Science, Toho
2 Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS 8523, CERLA, Université Lille 1, 59655 Villeneuve d’Ascq Cedex, France
Accepted: 26 November 2010
Context. Pure rotational spectra in the field-free condition of the CH2 and CD2 isotopologues of the methylene radical have already been reported, whereas only six rotational transitions of the mono-deuterated species, CHD, detected by FIR-LMR spectroscopy have been.
Aims. Spectra of the mono-deuterated methylene radical in its ground electronic state () were observed in the field-free condition for the first time in the frequency region below 1 THz.
Methods. CHD was generated in a positive column discharge in a CH2D2 – Ar mixture cooled with liquid nitrogen.
Results. Two rotational transitions, each split into three fine-structure components, were measured. The B and C rotational constants, the ϵbb and ϵcc spin-rotation constants, and the β spin-spin constant were revised.
Conclusions. The reported frequencies are suitable for astronomical searches.
Key words: line: identification / molecular data / ISM: molecules / submillimetre: ISM
© ESO, 2011
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