Submillimeter-wave spectroscopy of and interstellar search for thioacetaldehyde

Margulès, L.; Ilyushin, V. V.; McGuire, Brett A.; Беллоче, А.; Motiyenko, R. A.; Remijan, Anthony J.; Alekseev, E. A.; Dorovskaya, O.; Guillemin, Jean‐Claude

doi:10.1016/j.jms.2020.111304

Cited by 12 publications

(9 citation statements)

References 55 publications

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“…We have recently investigated the millimeter spectra of several sulfur compounds with a relatively small number of atoms, whose corresponding oxygen derivative has been detected in the ISM and that are among the thermodynamically most stable compounds for a given formula: thioacetaldehyde (CH 3 -C(S)H, Margulès et al 2020a), propynethial (HC≡CCHS, Margulès et al 2020b), and S-methyl thioformate (CH 3 SC(O)H, Jabri et al 2020). We report here the millimeter-and submillimeter-wave spectrum of thioformamide (NH 2 CHS), a six-atom compound.…”

Section: Introductionmentioning

confidence: 99%

Millimeter- and submillimeter-wave spectroscopy of thioformamide and interstellar search toward Sgr B2(N)

Motiyenko

Беллоче

Garrod

et al. 2020

A&A

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Context. Thioformamide NH2CHS is a sulfur-bearing analog of formamide NH2CHO. The latter was detected in the interstellar medium back in the 1970s. Most of the sulfur-containing molecules detected in the interstellar medium are analogs of corresponding oxygen-containing compounds. Therefore, thioformamide is an interesting candidate for a search in the interstellar medium. Aims. A previous study of the rotational spectrum of thioformamide was limited to frequencies below 70 GHz and to transitions with J ≤ 3. The aim of this study is to provide accurate spectroscopic parameters and rotational transition frequencies for thioformamide to enable astronomical searches for this molecule using radio telescope arrays at millimeter wavelengths. Methods. The rotational spectrum of thioformamide was measured and analyzed in the frequency range 150−660 GHz using the Lille spectrometer. We searched for thioformamide toward the high-mass star-forming region Sagittarius (Sgr) B2(N) using the ReMoCA spectral line survey carried out with the Atacama Large Millimeter/submillimeter Array. Results. Accurate rigid rotor and centrifugal distortion constants were obtained from the analysis of the ground state of parent, 34S, 13C, and 15N singly substituted isotopic species of thioformamide. In addition, for the parent isotopolog, the lowest two excited vibrational states, v12 = 1 and v9 = 1, were analyzed using a model that takes Coriolis coupling into account. Thioformamide was not detected toward the hot cores Sgr B2(N1S) and Sgr B2(N2). The sensitive upper limits indicate that thioformamide is nearly three orders of magnitude at least less abundant than formamide. This is markedly different from methanethiol, which is only about two orders of magnitude less abundant than methanol in both sources. Conclusions. The different behavior shown by methanethiol versus thioformamide may be caused by the preferential formation of the latter (on grains) at late times and low temperatures, when CS abundances are depressed. This reduces the thioformamide-to-formamide ratio, because the HCS radical is not as readily available under these conditions.

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Section: Introductionmentioning

confidence: 99%

Millimeter- and submillimeter-wave spectroscopy of thioformamide and interstellar search toward Sgr B2(N)

Motiyenko

Беллоче

Garrod

et al. 2020

A&A

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“…Since these precursor species have yet to be directly detected on grain surfaces, it is unlikely that analogous routes with S-bearing species in reactions (6-8) would lead to the formation of larger S-bearing molecules. In addition, dedicated searches for larger S-bearing molecules have taken place over a variety of sources with several non-detections (for example, CH 3 CHS (Margulès et al 2020a), HCCCHS (Margulès et al 2020b), and NH 2 CHS (Margulès et al 2020b)) and toward locations where comparative O-chemistry may not be present (Cernicharo et al 2021). As such, it is currently difficult to constrain any of the chemistry with such a disparate set of data, yet trends comparing the relative abundances between the O-bearing vs. S-bearing species have been done toward those sources even if all we have are upper limits to the column densities which may eventually lead to a better determination of the formation pathways of both families of molecules.…”

Section: Discussionmentioning

confidence: 99%

Expanding the submillimeter wave spectroscopy and astronomical search for thioacetamide (CH3CSNH2) in the ISM

Remijan,

Xue,

Margulès

et al. 2021

Preprint

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Context. One of the biggest unsolved mysteries of modern astrochemistry is understanding chemical formation pathways in the interstellar medium (ISM) and circumstellar environments (CSEs). The detections (or even nondetections) of molecules composed of low-abundance atomic species (such as S, P, Si, and Mg) may help to constrain chemical pathways. Thioacetamide (CH 3 CSNH 2 ) is the sulfur analog to acetemide (CH 3 CONH 2 ) and it is a viable candidate to search for in astronomical environments -specifically toward regions where other S-bearing molecules have been found and, if possible, that also contain a detection of CH 3 CONH 2 . If detected, it would not only continue to expand the view of molecular complexity in astronomical environments, but also help to better elucidate the possible formation pathways of these types of species in these environments. Aims. Our aim is to expand the frequency range of the measured rotational spectrum of CH 3 CSNH 2 beyond 150 GHz and then to use those measurements to extend the search for this species in the ISM. The new laboratory measurements and expanded search cover more parameter space for determining under what conditions CH 3 CSNH 2 may be detected, leading to possible constraints on the formation of large S-bearing molecules found in the ISM. Methods. The rotational spectrum of CH 3 CSNH 2 was investigated up to 650 GHz. Using the newly refined spectrum of CH 3 CSNH 2 , as well as additional spectroscopic data on the chemically related species CH 3 CONH 2 , a variety of astronomical sources were searched including data from the following large surveys: Prebiotic Interstellar Molecule Survey (PRIMOS) conducted with the Green Bank Telescope (GBT); Exploring molecular complexity with ALMA (EMoCA) conducted with the Atacama Large Millimeter/submillimeter Array (ALMA); and Astrochemical Surveys At IRAM (ASAI) conducted with the Institut de Radioastronomie Millimétrique (IRAM) 30m Telescope. Results. A total of 1428 transitions from the v t =0 state with maximum values J=47 and K a =20 in the range up to 330 GHz, and J=95 and K a =20 in the range from 400-660 GHz were assigned. We also assigned 321 transitions from the v t =1 state with the maximum values J=35 and K a =9 up to 330 GHz. We achieved a final fit with a root-mean-square deviation of 43.4 kHz that contains 2035 measured lines from our study and the literature for v t =0 and v t =1 states of A and E symmetries. The final fit is based on the rho-axismethod (RAM) Hamiltonian model that includes 40 parameters. An astronomical search for CH 3 CSNH 2 was conducted based on all the new spectroscopic data. No transitions of CH 3 CSNH 2 were detected toward any of the sources contained in our survey. Using the appropriate telescope and physical parameters for each astronomical source, upper limits to the column densities were found for CH 3 CSNH 2 toward each source.

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“…Especially, some CxHySz isomers have received considerable attention of astronomical observation in recent years. So far, some sulfur-bearing 2 molecules [2][3][4][5][6][7] have been identified in the interstellar medium (ISM). In order to systematacially understand the sulfur chemistry in the astrophysical environment, new molecules with multiple sulfur atoms are required to search in some planetary atmospheres or surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Sulfur is a highly abundant element in the galaxy, and more than 20 sulfur compounds have been detected in some astrophysical environments [1,2] . Especially, some CxHySz isomers have received considerable attention of astronomical observation in recent years.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic constants and anharmonic force field of dithioformic acid and its isomers: a theoretical study

Pang

Song

Sun

et al. 2021

Preprint

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The potential astronomical interest dithioformic acid (trans-HC(=S)SH) exists five isomers and has received considerable attention of astronomical observation in recent years. The different positions of H atoms of five isomers lead to diverse point groups, dipole moments, and spectroscopic constants. The anharmonic force field and spectroscopic constants of them are calculated using CCSD(T) and B3LYP employing correlation consistent basis sets. Molecular structures, dipole moments, rotational constants, and fundamental frequencies of trans-HC(=S)SH are compared with the available experimental data. The B3LYP/Gen=5 and CCSD(T)/Gen=Q results can reproduce them well. Molecular structures, dipole moments, relative energies, spectroscopic constants of cis-HC(=S)SH and dithiohydroxy carbene (DTHC) are also calculated. The new data obtained in this study are expected to guide the future high resolution experimental work and to assist astronomical search for CH2S2.

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Submillimeter-wave spectroscopy of and interstellar search for thioacetaldehyde

Cited by 12 publications

References 55 publications

Millimeter- and submillimeter-wave spectroscopy of thioformamide and interstellar search toward Sgr B2(N)

Millimeter- and submillimeter-wave spectroscopy of thioformamide and interstellar search toward Sgr B2(N)

Expanding the submillimeter wave spectroscopy and astronomical search for thioacetamide (CH3CSNH2) in the ISM

Spectroscopic constants and anharmonic force field of dithioformic acid and its isomers: a theoretical study

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