High-resolution millimeter-wave spectroscopy of CH\(_2\)DCl: paving the way for future astronomical observations of chloromethane isotopologues

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 monodeut...

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Bibliographic Details
Published inarXiv.org
Main Authors Melosso, M, Achilli, A, Tamassia, F, Canè, E, Charmet, A Pietropolli, Stoppa, P, Dore, L
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 24.06.2020
Subjects
Chlorine
High resolution
Infrared analysis
Infrared spectra
Interstellar matter
Methyl chloride
Millimeter waves
Organochlorine compounds
Rotational spectra
Spectrum analysis
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2006.13676