High resolution rotational spectroscopy of HCSSH: A CS2 proxy in the ISM

Prudenzano, Domenico

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https://hdl.handle.net/2142/96870 Copy

Description

Title

High resolution rotational spectroscopy of HCSSH: A CS2 proxy in the ISM

Author(s)

Prudenzano, Domenico

Contributor(s)

• Caselli, Paola
• Palumbo, Maria Elisabetta
• Laas, Jacob

Issue Date

2017-06-20

Keyword(s)

Atacama Large Millimeter/submillimeter Array (ALMA)'s molecular view

Abstract

In the last few decades sulfur bearing molecules have become a relevant topic in astrochemistry. The observed overall abundances of these compounds in the dense gas and around young stellar objects is indeed not in agreement with the estimated cosmic abundance of sulfur (Tieftrunk et al. 1994; Palumbo et al. 1997). _x000d_ Many studies point to polysulphanes and sulphur polymers, mainly S$_{8}$, as possible sulfur reservoirs, which from solid phase might be released into gas phase as simpler sulfur compounds, e.g. in shocked or hot environments (Wakelam et al. 2004; Laas, in prep.). _x000d_ Laboratory studies on dust and ice analogues indicate CS$_{2}$ as a potential decomposition product of the sulfur residue (Jiménez-Escobar et al. 2014 and references therein). Nevertheless, this species is not detectable by radio-telescopes due to lack of permanent dipole moment. _x000d_ Dithioformic acid (HCSSH), a possible byproduct of interstellar CS$_{2}$, may thus serve as a proxy for this non-polar S-bearing molecule. _x000d_ Millimeter and sub-millimeter spectra have been recorded and analyzed for the trans and cis conformers of HCSSH, up to 478 GHz. We employed the frequency modulation sub-millimeter absorption spectrometer recently developed at the Center for Astrochemical Studies (CAS) in Garching. HCSSH was produced by a glow discharge mixture of CS$_{2}$ and H$_{2}$ diluted in Ar._x000d_ Accurate rest frequencies, which might serve as guidance for astronomical searches have been obtained thanks to our recent experiment. In particular trans-HCSSH, the lowest-energy conformer, is the best candidate for a potential detection.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/96870

DOI

https://doi.org/10.15278/isms.2017.TF04

Copyright and License Information

Copyright 2017 Domenico Prudenzano

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