New Measurements and Assignments in the Millimeter-Wave Spectrum of CD3OH

Predoi‐Cross, Adriana; Xu, Li‐Hong; Walsh, Matthew S.; Lees, R. M.; Winnewisser, M.; Lichau, Holger

doi:10.1006/jmsp.1997.7504

Cited by 6 publications

(1 citation statement)

References 17 publications

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“…Lees & Baker (1968) published the first extensive study of its rotational spectrum in the millimeter wave region by investigating the torsion-rotation interaction in the methanol isotopologs CH 3 OH, CD 3 OH, and CH 3 OD. Additional accounts on its rotational spectrum were published with infrared (Mollabashi et al 1993a) and microwave accuracy (Baskakov & Pashaev 1992;Mollabashi et al 1993b;Predoi-Cross et al 1998). The latest of these studies also led to a thorough analysis of the CD 3 OH rotational spectrum in the ground and first excited torsional states (Walsh et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Rotational and rovibrational spectroscopy of CD₃OH with an account of CD₃OH toward IRAS 16293−2422

Ilyushin

Müller

Jørgensen

et al. 2022

A&A

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Solar-type protostars have been shown to harbor highly deuterated complex organics, as evidenced, for instance, by the high relative abundances of doubly and triply deuterated isotopologs. While this degree of deuteration may provide important clues in studying the formation of these species, spectroscopic information on multiply deuterated isotopologs is often insufficient. In particular, searches for triply deuterated methanol, CD3OH, are hampered to a large extent by the lack of intensity information from a spectroscopic model. The aim of the present study is to develop a spectroscopic model of CD3OH in low-lying torsional states that is sufficiently accurate to facilitate further searches for CD3OH in space. We performed a new measurement campaign for CD3OH involving three spectroscopic laboratories that covers the 34 GHz−1.1 THz and the 20−900 cm−1 ranges. The analysis was performed using the torsion-rotation Hamiltonian model based on the rho-axis method. We determined a model that describes the ground and first excited torsional states of CD3OH, up to quantum numbers J ≤ 55 and Ka ≤ 23, and we derived a line list for radio-astronomical observations. The resulting line list is accurate up to at least 1.1 THz and should be sufficient for all types of radio-astronomical searches for this methanol isotopolog. This line list was used to search for CD3OH in data from the Protostellar Interferometric Line Survey of IRAS 16293−2422 using the Atacama Large Millimeter/submillimeter Array. Specifically, CD3OH is securely detected in the data, with a large number of clearly separated and well-reproduced lines. We not only detected lines belonging to the ground torsional state, but also several belonging to the first excited torsional state. The derived column density of CD3OH and abundance relative to the non-deuterated isotopolog confirm the significant enhancement of this multiply deuterated variant. This finding is in line with other observations of multiply deuterated complex organic molecules and may serve as an important constraint on their formation models.

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Section: Introductionmentioning

confidence: 99%

Rotational and rovibrational spectroscopy of CD₃OH with an account of CD₃OH toward IRAS 16293−2422

Ilyushin

Müller

Jørgensen

et al. 2022

A&A

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Global Fit of Torsion–Rotation Transitions in the Ground and First Excited Torsional States of CD3OH Methanol

Walsh

Lees

1998

Journal of Molecular Spectroscopy

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Fourier transform synchrotron spectroscopy of the in-plane methyl-rocking band of CD3OH

Lees

Song

et al. 2015

Journal of Molecular Spectroscopy

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New Measurements and Assignments in the Millimeter-Wave Spectrum of CD3OH

Cited by 6 publications

References 17 publications

Rotational and rovibrational spectroscopy of CD₃OH with an account of CD₃OH toward IRAS 16293−2422

Rotational and rovibrational spectroscopy of CD₃OH with an account of CD₃OH toward IRAS 16293−2422

Global Fit of Torsion–Rotation Transitions in the Ground and First Excited Torsional States of CD3OH Methanol

Fourier transform synchrotron spectroscopy of the in-plane methyl-rocking band of CD3OH

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New Measurements and Assignments in the Millimeter-Wave Spectrum of CD3OH

Cited by 6 publications

References 17 publications

Rotational and rovibrational spectroscopy of CD3OH with an account of CD3OH toward IRAS 16293−2422

Rotational and rovibrational spectroscopy of CD3OH with an account of CD3OH toward IRAS 16293−2422

Global Fit of Torsion–Rotation Transitions in the Ground and First Excited Torsional States of CD3OH Methanol

Fourier transform synchrotron spectroscopy of the in-plane methyl-rocking band of CD3OH

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Rotational and rovibrational spectroscopy of CD₃OH with an account of CD₃OH toward IRAS 16293−2422

Rotational and rovibrational spectroscopy of CD₃OH with an account of CD₃OH toward IRAS 16293−2422