{
  "abstract": "In this work, we constructed the first potential energy surface (PES) for the HOCS+–He complex using the explicitly correlated ab initio CCSD(T)-F12/aug-cc-pVTZ method. An examination of this PES revealed the existence of three potential wells, the deepest of which is 297.25 cm−1, located in the HOCS+ plane, on the hydrogen atom side. We used this PES in dynamical calculations to determine the rate coefficients at which the rotational energy of HOCS+ is exchanged by collisions with He. Rotational transitions involving the lowest 31 energy levels of HOCS+ (up to Erot < 40.2 cm−1) were studied. The quantum close-coupling method (CC) is applied for calculating cross sections at total energies below 50 cm−1. The coupled-states approach (CS) is employed for calculations covering energies up to 500 cm−1. By averaging these cross sections over a Maxwell-Boltzmann distribution, we calculated the rate coefficients for temperatures ranging from 2 to 100 K. In the studied temperature range, a slight dominance of rotational transitions with ΔJ = ΔKc = −1 and ΔKa = 0 was observed. The rate coefficients calculated for HOCS+ ion are compared with those of its valence-isoelectronic molecule HOCO+, specifically for collisions involving He. A similarity was observed, especially for low ΔJ. We expect that the new rate coefficients will help to analyze present and future observations of this key molecule for interstellar chemistry.",
  "abstract_shown": true,
  "affiliations": [
    "Faculty of Sciences, University of Tunis El Manar LSAMA, Department of Physics, , 1060 Tunis ,",
    "College of Science Department of Physics, , Umm Al-Qura University, Makkah Almukarramah, 24382 ,",
    "Faculty of Sciences of Bizerte, University of Carthage LR01ES15, Department of Physics, , Zarzouna, 7021 ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "I Ben Salem"
    },
    {
      "affs": [
        0
      ],
      "name": "A Chefai"
    },
    {
      "affs": [
        0
      ],
      "name": "O Yazidi"
    },
    {
      "affs": [
        1
      ],
      "name": "A Al-Ahmadi"
    },
    {
      "affs": [
        0
      ],
      "name": "K Hammami",
      "orcid": "0000-0002-1370-4440"
    },
    {
      "affs": [
        2
      ],
      "name": "H Elabidi",
      "orcid": "0000-0001-6548-6310"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/akpmqwa71pm08.bib",
  "cited_by": 0,
  "doi": "10.1093/mnras/stag2075",
  "fulltext_url": null,
  "id": "akpmqwa71pm08",
  "issns": [
    "0035-8711",
    "1365-2966"
  ],
  "landing_url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2075/9005625",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [],
  "openalex": null,
  "pdf_url": "https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stag2075/72621460/stag2075.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-30",
  "publisher": "Oxford University Press (OUP)",
  "ris": "https://research.draconitic.com/paper/akpmqwa71pm08.ris",
  "sources": [
    {
      "first_seen": "2026-10-31T00:20:43Z",
      "native_id": "10.1093/mnras/stag2075",
      "source": "crossref",
      "url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2075/9005625"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "First rotational (de-)excitation of HOCS+( X 1 A ′) by collision with He(1S): rate coefficients and potential energy surface",
  "title_text": "First rotational (de-)excitation of HOCS+( X 1 A ′) by collision with He(1S): rate coefficients and potential energy surface",
  "type": "peer-reviewed",
  "updated_at": "2026-10-31T00:20:43Z",
  "url": "https://research.draconitic.com/paper/akpmqwa71pm08",
  "venue": "Monthly Notices of the Royal Astronomical Society",
  "versions": []
}