Abstract
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 CH2 D2 – 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 ϵ bb and ϵ cc spin-rotation constants, and the β spin-spin constant were revised. Conclusions. The reported frequencies are suitable for astronomical searches.
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