{
  "abstract": "Reliable collisional rate coefficients are crucial for interpreting the rotational emission spectra of molecules in interstellar clouds. In this work, we construct a two-dimensional potential energy surface (PES) for the $\\mathrm{HC}_5\\mathrm{NH}^+$--He system at the CCSD(T)-F12B/cc-pVTZ-F12 level of theory. Rotationally inelastic cross sections are calculated using the quantum close-coupling (CC) method, and the corresponding collisional rate coefficients are obtained by thermal averaging over a Maxwell--Boltzmann distribution. We use these collisional data in a non-local thermodynamic equilibrium (non-LTE) radiative transfer model to investigate the excitation of $\\mathrm{HC}_5\\mathrm{NH}^+$ in the cold dark cloud TMC-1. A global $χ^2$ minimization analysis of seven observed lines yields best-fitting values of $n(\\mathrm{H}_2)=1.63\\times10^{5}$\\,cm$^{-3}$ and $N(\\mathrm{H}_2)=5.09\\times10^{11}$\\,cm$^{-2}$, with reduced $χ^2_{\\min}=0.87$. The modelled line intensities are in good agreement with the observations. These results provide insight into the collisional excitation and radiative properties of $\\mathrm{HC}_5\\mathrm{NH}^+$ under the physical conditions prevailing in TMC-1.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.08197",
  "author_total": 5,
  "authors": [
    {
      "name": "Ziyu Xiang"
    },
    {
      "name": "Liman Tian"
    },
    {
      "name": "Tong Sun"
    },
    {
      "name": "Wenli Zou"
    },
    {
      "name": "Xiaolin Chen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ak1gefhkyfr67.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.08197",
  "fulltext_url": null,
  "id": "ak1gefhkyfr67",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.08197",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.08197",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ak1gefhkyfr67.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.08197",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.08197"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Rotational Excitation of HC$_5$NH$^+$ by He: Collision Dynamics and Astrophysical Applications",
  "title_text": "Rotational Excitation of HC_5NH^+ by He: Collision Dynamics and Astrophysical Applications",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:41Z",
  "url": "https://research.draconitic.com/paper/ak1gefhkyfr67",
  "venue": "arXiv",
  "versions": []
}