High-resolution millimeter-wave spectroscopy of CH${}_2$DCl: paving the way for future astronomical observations of chloromethane isotopologues

Abstract

Chloromethane is the only organochloride detected in space to date. Its recent observation towards the low-mass protostar IRAS 16293-2422 with ALMA offers a prompt for new laboratory studies of CH${}_3$Cl and its isotopologues. Here, we report the investigation of the rotational spectrum of monodeuterated chloromethane CH${}_2$DCl in the frequency region between 90 and 300 GHz. The measurements have been carried out with a frequency-modulation millimeter-wave spectrometer, arranged to perform saturation spectroscopy. From the analysis of hyperfine-resolved spectra of the two chlorine isotopologues CH${}_2$D${}^{35}$Cl and CH${}_2$D${}^{37}$Cl, consistent sets of accurate spectroscopic parameters have been obtained. This work provides reliable spectral predictions which can be used to guide radio-astronomical searches of CH${}_2$DCl in the interstellar medium and represents a solid base for future analyses of high-resolution infrared spectra of monodeuterated chloromethane.

arXiv comment13 pages, 2 figures, 3 tables

References in corpus (12)

• Exoplanet Biosignatures: A Review of Remotely Detectable Signs of Life
• 2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules
• First detection of triply-deuterated methanol
• Detection of doubly-deuterated methanol in the solar-type protostar IRAS16293-2422
• A study of deuterated water in the low-mass protostar IRAS16293-2422
• Interstellar deuterated ammonia: From NH3 to ND3
• The ALMA-PILS survey: Complex nitriles towards IRAS 16293--2422
• First Results of an ALMA Band 10 Spectral Line Survey of NGC 6334I: Detections of Glycolaldehyde (HC(O)CH${}_2$OH) and a New Compact Bipolar Outflow in HDO and CS
• Laboratory measurements and astronomical search for cyanomethanimine
• The rotational spectrum of ${}^{15}$ND. Isotopic-independent Dunham-type analysis of the imidogen radical
• ExoMol line lists - XXIX. The rotation-vibration spectrum of methyl chloride up to 1200 K
• The Sub-millimeter Rotational Spectrum of Ethylene Glycol up to 890 GHz and Application to ALMA Band 10 Spectral Line Data of NGC 6334I