Experimental and computational studies of the hydrogenation of carbon disulfide (CS2) on ice analogues
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| Format: | Preprint |
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2026
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| _version_ | 1866914348197216256 |
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| author | Nguyen, Thanh Molpeceres, Germán Oba, Yasuhiro Agúndez, Marcelino Esplugues, Gisela Cernicharo, José Watanabe, Naoki |
| author_facet | Nguyen, Thanh Molpeceres, Germán Oba, Yasuhiro Agúndez, Marcelino Esplugues, Gisela Cernicharo, José Watanabe, Naoki |
| contents | Carbon disulfide (CS$_2$) is one of the sulfur-bearing species expected to be present in the interstellar medium (ISM). In this study, we investigated the surface reactions of solid CS$_2$ with hydrogen (H) atoms on amorphous solid water (ASW) using laboratory experiments supported by computational calculations. Our results show that CS$_2$ reacts with H atoms through quantum tunneling in the initial step, followed by successive H addition reactions, with or without activation barriers, on icy surfaces. These processes lead to the formation of several sulfur-bearing species, including hydrogen sulfide (H$_2$S), methyl mercaptan (CH$_3$SH), and small amounts of dithioformic acid (HC(S)SH) and methanedithiol (CH$_2$(SH)$_2$). The observed reactivity of CS$_2$ with H atoms provides a plausible explanation for the non-detection of CS$_2$ in interstellar ices. Furthermore, the efficient hydrogenation of the complex molecules derived from CS$_2$, namely HC(S)SH and CH$_2$(SH)$_2$, suggests that these species could be easily undergone with H atoms to produce other S-bearing species under ISM conditions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_21126 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Experimental and computational studies of the hydrogenation of carbon disulfide (CS2) on ice analogues Nguyen, Thanh Molpeceres, Germán Oba, Yasuhiro Agúndez, Marcelino Esplugues, Gisela Cernicharo, José Watanabe, Naoki Astrophysics of Galaxies Carbon disulfide (CS$_2$) is one of the sulfur-bearing species expected to be present in the interstellar medium (ISM). In this study, we investigated the surface reactions of solid CS$_2$ with hydrogen (H) atoms on amorphous solid water (ASW) using laboratory experiments supported by computational calculations. Our results show that CS$_2$ reacts with H atoms through quantum tunneling in the initial step, followed by successive H addition reactions, with or without activation barriers, on icy surfaces. These processes lead to the formation of several sulfur-bearing species, including hydrogen sulfide (H$_2$S), methyl mercaptan (CH$_3$SH), and small amounts of dithioformic acid (HC(S)SH) and methanedithiol (CH$_2$(SH)$_2$). The observed reactivity of CS$_2$ with H atoms provides a plausible explanation for the non-detection of CS$_2$ in interstellar ices. Furthermore, the efficient hydrogenation of the complex molecules derived from CS$_2$, namely HC(S)SH and CH$_2$(SH)$_2$, suggests that these species could be easily undergone with H atoms to produce other S-bearing species under ISM conditions. |
| title | Experimental and computational studies of the hydrogenation of carbon disulfide (CS2) on ice analogues |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2602.21126 |