{
  "abstract": "Despite its low cosmic abundance, phosphorus is a bioessential element whose prebiotic availability and incorporation into biomolecules remain open questions. Only a few phosphorous containing molecules with P to C bonds have been detected in astronomical environments (CP, CCP, HCP). More complex species have been proposed, but their formation and destruction pathways remain poorly constrained. Gas-phase ion molecule chemistry involving P cations may contribute to organophosphorus formation, particularly in protostellar shocks and outflows, while reactions of ground state P cations with closed-shell neutrals provide benchmarks for spin-forbidden mechanisms. We investigate the reaction of P+ with C$_2$H$_2$ through a joint experimental and theoretical study aimed at revising astrochemical database rate coefficients. Absolute cross sections and branching ratios were measured as a function of collision energy and complemented by high-level electronic structure calculations and a refined capture model accounting for higher-order long-range interactions and intermediate complex formation. Channel-specific rate coefficients were derived in the range from 10 to 5000 K. The reaction produces predominantly HCCP$^+$ + H (branching ratio 99%), while CCP$^+$ + H$_2$ is a minor channel (branching ratio 1%) arising from intersystem crossing from the triplet to the singlet potential energy surfaces. The total rate coefficient at 300 K agrees well with the SIFT value, but it increases with decreasing temperature, deviating from a pure Langevin trend. The reaction should be included in astrochemical models where phosphorus is released as P+, such as during energetic processing of icy grains in shocks. It provides a pathway to linear HCCP$^+$, a potentially relevant precursor to the observed CP and CCP species through dissociative recombination",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.33657",
  "author_total": 11,
  "authors": [
    {
      "name": "Matteo Michielan"
    },
    {
      "name": "Jorge Alonso de la Fuente"
    },
    {
      "name": "Roland Thissen"
    },
    {
      "name": "Christian Alcaraz"
    },
    {
      "name": "Nicolas Solem"
    },
    {
      "name": "Cristina Sanz Sanz"
    },
    {
      "name": "Susana Gómez Carrasco"
    },
    {
      "name": "Miroslav Polášek"
    },
    {
      "name": "Alexandre Zanchet"
    },
    {
      "name": "Marcelino Agúndez"
    },
    {
      "name": "Daniela Ascenzi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fpykybjqyw2ys.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.33657",
  "fulltext_url": null,
  "id": "fpykybjqyw2ys",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.33657",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.EP"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.IM"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "openalex",
      "3103|Astrophysics and Star Formation Studies"
    ]
  ],
  "openalex": "W7214731644",
  "pdf_url": "https://arxiv.org/pdf/2609.33657",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fpykybjqyw2ys.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.33657",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.33657"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Synthesis of organo-phosphorous species in space: the reaction of P$^+$ with C$_2$H$_2$",
  "title_text": "Synthesis of organo-phosphorous species in space: the reaction of P^+ with C_2H_2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/fpykybjqyw2ys",
  "venue": "arXiv",
  "versions": []
}