Rotational Spectra of the Thiosulfeno Radical, HSS and DSS, between 0.3 and 0.9 THz

Tanimoto, Mitsutoshi; Klaus, Th.; Müller, H. S. P.; Winnewisser, G.

doi:10.1006/jmsp.1999.7990

Cited by 26 publications

(21 citation statements)

References 31 publications

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“…The spectrum of HS 2 in the range 6 400 -8 100 cm The ground state of the HS 2 radical has already been well characterised [8,10,11] At this level of resolution second order effects tend make certain misassignments obvious.…”

Section: Methodsmentioning

confidence: 99%

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The high resolution Fourier-transform chemiluminescence spectrum of the HS₂radical

Ashworth

Fink

2007

Molecular Physics

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Section: Methodsmentioning

confidence: 99%

“…Subsequently further recordings were made and the FIR LMR spectrum analysed [10]. Further work on the ground state has been carried out by Winnewisser and co-workers [11] in the millimetre wave region.…”

Section: Introductionmentioning

confidence: 99%

The high resolution Fourier-transform chemiluminescence spectrum of the HS₂radical

Ashworth

Fink

2007

Molecular Physics

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“…The rotational spectrum of S 2 H was calculated by Tanimoto et al (2000). The spectroscopic data can be found in the CDMS catalogue (Müller et al 2005).…”

Section: Column Densities and Abundancesmentioning

confidence: 99%

First Detection of Interstellar S₂H

Fuente

Goicoechea

Pety

et al. 2017

ApJL

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We present the first detection of gas phase S 2 H in the Horsehead, a moderately UV-irradiated nebula. This confirms the presence of doubly sulfuretted species in the interstellar medium and opens a new challenge for sulfur chemistry. The observed S 2 H abundance is ∼5×10 −11 , only a factor 4-6 lower than that of the widespread H 2 S molecule. H 2 S and S 2 H are efficiently formed on the UV-irradiated icy grain mantles. We performed ice irradiation experiments to determine the H 2 S and S 2 H photodesorption yields. The obtained values are ∼1.2×10 −3 and <1×10 −5 molecules per incident photon for H 2 S and S 2 H, respectively. Our upper limit to the S 2 H photodesorption yield suggests that photo-desorption is not a competitive mechanism to release the S 2 H molecules to the gas phase. Other desorption mechanisms such as chemical desorption, cosmic-ray desorption and grain shattering can increase the gaseous S 2 H abundance to some extent. Alternatively, S 2 H can be formed via gas phase reactions involving gaseous H 2 S and the abundant ions S + and SH + . The detection of S 2 H in this nebula could be therefore the result of the coexistence of an active grain surface chemistry and gaseous photo-chemistry.

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“…2 rotational spectrum were also taken from the CDMS. They were based on the analysis of Tanimoto et al (2000) which included lower frequency data from Yamamoto & Saito (1994).…”

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confidence: 99%

The sulfur depletion problem: upper limits on the H₂S₂, HS^·₂, and S₂gas-phase abundances toward the low-mass warm core IRAS 16293-2422

Martín-Doménech

Jiménez-Serra

Muñoz

et al. 2016

A&A

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Context. A fraction of the missing sulfur in dense clouds and circumstellar regions could be in the form of three species not yet detected in the interstellar medium: H 2 S 2 , HS . 2 , and S 2 according to experimental simulations performed under astrophysically relevant conditions. These S-S bonded molecules can be formed by the energetic processing of H 2 S-bearing ice mantles on dust grains, and subsequently desorb to the gas phase. Aims. The detection of these species could partially solve the sulfur depletion problem, and would help to improve our knowledge of the poorly known chemistry of sulfur in the interstellar medium. To this purpose we calculated the frequencies and expected intensities of the rotational transitions not previously reported, and performed dedicated ground-based observations toward the low-mass warm core IRAS 16293-2422, a region with one of the highest measured gas-phase H 2 S abundances. Methods. Observations in the submillimeter regime were obtained with the APEX 12 m telescope during 15 h of observation. A total of ∼16 GHz were covered in a range of about 100 GHz, targeting a wide selection of the predicted rotational transitions of the three molecules.Results. The 1σ noise rms values were extracted in the spectral regions where the targeted species should have been detected. These values were a factor of 2−7 lower than those reached by previous observations toward the same source, and allowed us to estimate a 1σ upper limit to their molecular abundances of ≤8.1 × 10 −9 , ≤1.1 × 10 −8 , and ≤2.9 × 10 −7 relative to H 2 , for H 2 S 2 , HS . 2 , and S 2 , respectively. Conclusions. The upper limit abundances of the three molecules containing the S 2 unit are up to two orders of magnitude lower than the H 2 S abundance in the source, and one order of magnitude lower than the expected abundances from the experimental simulations using ice analogs. Subsequent gas-phase chemistry after desorption could lower the abundances of the three species to undetectable levels in our observations.

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Rotational Spectra of the Thiosulfeno Radical, HSS and DSS, between 0.3 and 0.9 THz

Cited by 26 publications

References 31 publications

The high resolution Fourier-transform chemiluminescence spectrum of the HS₂radical

The high resolution Fourier-transform chemiluminescence spectrum of the HS₂radical

First Detection of Interstellar S₂H

The sulfur depletion problem: upper limits on the H₂S₂, HS^·₂, and S₂gas-phase abundances toward the low-mass warm core IRAS 16293-2422

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Rotational Spectra of the Thiosulfeno Radical, HSS and DSS, between 0.3 and 0.9 THz

Cited by 26 publications

References 31 publications

The high resolution Fourier-transform chemiluminescence spectrum of the HS2radical

The high resolution Fourier-transform chemiluminescence spectrum of the HS2radical

First Detection of Interstellar S2H

The sulfur depletion problem: upper limits on the H2S2, HS·2, and S2gas-phase abundances toward the low-mass warm core IRAS 16293-2422

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The high resolution Fourier-transform chemiluminescence spectrum of the HS₂radical

The high resolution Fourier-transform chemiluminescence spectrum of the HS₂radical

First Detection of Interstellar S₂H

The sulfur depletion problem: upper limits on the H₂S₂, HS^·₂, and S₂gas-phase abundances toward the low-mass warm core IRAS 16293-2422