Microwave and Fir Spectroscopy of Dimethylsulfide in the Ground, First and Second Excited Torsional States

Ilyushin, V. V.; Maul, C.; Bauerecker, S.; Manceron, L.; Jabri, Atef; Tchana, F. Kwabia; Motiyenko, R. A.; Margulès, L.; Alekseev, E.; Krapivin, Igor; Pogrebnyak, Mykola; Dorovskaya, Olga; Armieieva, I. A.

doi:10.15278/isms.2017.ti03

Cited by 2 publications

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“…Existing problems with the systematic understanding of interstellar sulfur chemistry [2,3,4,5] have motivated recent searches for new sulfurbearing interstellar molecules. To that purpose a number of studies of sulfur-bearing analogs, not yet detected in the ISM, of well known oxygen-bearing interstellar molecules have been performed in recent years: thioacetic acid (CH 3 COSH) [6], thioacetamide (CH 3 CSNH 2 ) [7], dimethylsulfide ((CH 3 ) 2 S) [8], O-and Sthiomethylformates (CH 3 SCHO, CH 3 OCHS) [9]. In this work, we present the results of a new spectroscopic study for the thioacetaldehyde molecule (CH 3 CHS).…”

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confidence: 99%

Submillimeter-wave spectroscopy of and interstellar search for thioacetaldehyde

Margulès

Ilyushin

McGuire

et al. 2020

Journal of Molecular Spectroscopy

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We present a new study of the millimeter and submillimeter wave spectra of the thioacetaldehyde molecule, CH 3 CHS, a sulfur-bearing analog of the ubiquitous interstellar molecule acetaldehyde (CH 3 CHO). Here, we present a laboratory investigation aimed at determining accurate spectroscopic parameters for CH 3 CHS to enable astronomical searches for this molecule using radio telescope arrays at millimeter and submillimeter wavelengths. New laboratory measurements have been carried out between 150 and 660 GHz using the spectrometer of PhLAM in Lille (France). Rotational transitions up to J = 60 were assigned in the ground, first and second excited torsional states of thioacetaldehyde and fit using the RAM Hamiltonian model. The final fit includes 62 parameters to give an overall weighted root-mean-square deviation of 0.9. On the basis of our spectroscopic results, CH 3 CHS was searched for, but not detected, in data from the Atacama Large Millimeter/submillimeter Array (ALMA) between 84 GHz and 114 GHz toward the hot molecular core Sgr B2(N2). The non-detection implies that thioacetaldehyde is at least 90 times less abundant than acetaldehyde in this source. We also searched for but found no evidence of thioacetaldehyde in a number of prestellar and protostellar sources targeted by the Astrochemical Surveys at IRAM (ASAI) Large Program in nearby low-mass star forming regions.

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Section: Introductionmentioning

confidence: 99%

Submillimeter-wave spectroscopy of and interstellar search for thioacetaldehyde

Margulès

Ilyushin

McGuire

et al. 2020

Journal of Molecular Spectroscopy

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Spectroscopy of Interstellar Internal Rotors: An Important Tool for Investigating Interstellar Chemistry

Kleiner

2019

ACS Earth Space Chem.

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This paper is a review of molecules with internal rotors detected or tentatively detected with upper limits in the interstellar medium. Internal rotor molecules containing one or two methyl groups are present at each of the different phases leading to stellar and planetary formation, from the molecular clouds to the star and its planets. They are also found in comets and asteroids. They represent a ubiquitous hydrogen-rich substituent in many complex organic molecules. This paper shows how high resolution spectra (mainly in the microwave, millimeter and sub-millimeter wave range) are analyzed in the laboratory and what theoretical methods can be used to properly reproduce the spectra. We also present a range of examples of important methyl rotors studied and how they can be used as tools to study the chemistry of interstellar medium.

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Microwave and Fir Spectroscopy of Dimethylsulfide in the Ground, First and Second Excited Torsional States

Cited by 2 publications

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Submillimeter-wave spectroscopy of and interstellar search for thioacetaldehyde

Submillimeter-wave spectroscopy of and interstellar search for thioacetaldehyde

Spectroscopy of Interstellar Internal Rotors: An Important Tool for Investigating Interstellar Chemistry

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