2020
DOI: 10.1016/j.jqsrt.2020.106982
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High-resolution millimeter-wave spectroscopy of CH2DCl: 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 millimeterwave spectrometer, arranged to perform saturation spectroscopy.… Show more

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Cited by 5 publications
(3 citation statements)
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“…For the most stable E ‐PMI, the spectral analysis has been extended in the 83–100 GHz range, thus allowing the improvement of the spectroscopic parameters, using a frequency‐modulation millimeter‐wave (FM‐mmW) spectrometer (see ref. [38] for a detailed description). In this experiment, a different production method of PMI has been employed, as reasoned below.…”
Section: Resultsmentioning
confidence: 99%
“…For the most stable E ‐PMI, the spectral analysis has been extended in the 83–100 GHz range, thus allowing the improvement of the spectroscopic parameters, using a frequency‐modulation millimeter‐wave (FM‐mmW) spectrometer (see ref. [38] for a detailed description). In this experiment, a different production method of PMI has been employed, as reasoned below.…”
Section: Resultsmentioning
confidence: 99%
“…The analysis of 6 of CH2D 37 Cl started with the identification of the resolved details of the q PK(J) and q RK(J) clusters using predicted values and considering the ro-vibrational structure of the same band of CH2D 35 Cl [20]. The preliminary calculations were performed by setting the band origin at 708.43 cm -1 [20] and employing the very recent ground state constants [19] for both ground and upper state. Then, new predictions with higher J and Ka quantum numbers were made, providing further assignments and new refinements, and so forth.…”
Section: Resultsmentioning
confidence: 99%
“…Therefore, we decided to support the search of mono-deuterated chloromethane in the interstellar medium by providing accurate spectroscopic data for both the CH2D 35 Cl and CH2D 37 Cl isotopologues. In our previous work [19] we measured the spectrum of these species in the millimeter region obtaining precise rest frequencies and an accurate set of ground state constants. The present study deals with the infrared spectrum of this molecule; to complement the data already available for CH2D 35 Cl [20 22] here we report on the ro-vibrational analysis of CH2D 37 Cl focusing on the intense absorptions falling in the region between 15.4 and 9.3 m. This region is characterized by the very strong features of the 6 band associated to the C-Cl stretching centered at about 708 cm -1 , and by the presence of two fundamentals related to the in-plane C-D bending ( 5, 826 cm -1 ) and the C-D/CH2 out-of-plane bending ( 9, 986 cm -1 ).…”
Section: Introductionmentioning
confidence: 99%