Advancing spectroscopic understanding of HOCS$^+$: Laboratory investigations and astronomical implications
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912043540414464 |
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| author | Lattanzi, Valerio Sanz-Novo, Miguel Rivilla, Víctor M. Araki, Mitsunori Bunn, Hayley A Martín-Pintado, Jesús Jiménez-Serra, Izaskun Caselli, Paola |
| author_facet | Lattanzi, Valerio Sanz-Novo, Miguel Rivilla, Víctor M. Araki, Mitsunori Bunn, Hayley A Martín-Pintado, Jesús Jiménez-Serra, Izaskun Caselli, Paola |
| contents | Sulphur-bearing species play crucial roles in interstellar chemistry, yet their precise characterisation remains challenging. Here, we present laboratory experiments aimed at extending the high-resolution spectroscopy of protonated carbonyl sulphide (HOCS$^+$), a recently detected molecular ion in space. Using a frequency-modulated free-space absorption spectrometer, we detected rotational transitions of HOCS$^+$ in an extended negative glow discharge with a mixture of H$_2$ and OCS, extending the high-resolution rotational characterisation of the cation well into the millimetre wave region (200-370 GHz). Comparisons with prior measurements and quantum chemical calculations revealed an overall agreement in the spectroscopic parameters. With the new spectroscopic dataset in hand, we re-investigated the observations of HOCS$^+$ towards G+0.693-0.027, which were initially based solely on K$_a$ = 0 lines contaminated by HNC$^{34}$S. This re-investigation enabled the detection of weak K$_a$ = 0 transitions, free from HNC$^{34}$S contamination. Our high-resolution spectroscopic characterisation also provides valuable insights for future millimetre and submillimetre astronomical observations of these species in different interstellar environments. In particular, the new high-resolution catalogue will facilitate the search for this cation in cold dark clouds, where very narrow line widths are typically observed. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_03798 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Advancing spectroscopic understanding of HOCS$^+$: Laboratory investigations and astronomical implications Lattanzi, Valerio Sanz-Novo, Miguel Rivilla, Víctor M. Araki, Mitsunori Bunn, Hayley A Martín-Pintado, Jesús Jiménez-Serra, Izaskun Caselli, Paola Astrophysics of Galaxies Sulphur-bearing species play crucial roles in interstellar chemistry, yet their precise characterisation remains challenging. Here, we present laboratory experiments aimed at extending the high-resolution spectroscopy of protonated carbonyl sulphide (HOCS$^+$), a recently detected molecular ion in space. Using a frequency-modulated free-space absorption spectrometer, we detected rotational transitions of HOCS$^+$ in an extended negative glow discharge with a mixture of H$_2$ and OCS, extending the high-resolution rotational characterisation of the cation well into the millimetre wave region (200-370 GHz). Comparisons with prior measurements and quantum chemical calculations revealed an overall agreement in the spectroscopic parameters. With the new spectroscopic dataset in hand, we re-investigated the observations of HOCS$^+$ towards G+0.693-0.027, which were initially based solely on K$_a$ = 0 lines contaminated by HNC$^{34}$S. This re-investigation enabled the detection of weak K$_a$ = 0 transitions, free from HNC$^{34}$S contamination. Our high-resolution spectroscopic characterisation also provides valuable insights for future millimetre and submillimetre astronomical observations of these species in different interstellar environments. In particular, the new high-resolution catalogue will facilitate the search for this cation in cold dark clouds, where very narrow line widths are typically observed. |
| title | Advancing spectroscopic understanding of HOCS$^+$: Laboratory investigations and astronomical implications |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2408.03798 |