{
  "abstract": "We present improved hot line lists for optical transitions between the mutually perturbed B ² Σ ⁺ , A ² Π, and X ² Σ ⁺ states of the minor CN isotopologues ¹³ C ¹⁴ N, ¹² C ¹⁵ N, and ¹³ C ¹⁵ N. Accurate line positions and intensities for these isotopologues are required for high-resolution analyses of stellar CN red-system spectra and cometary CN violet-band fluorescence, where minor-isotopologue features are used to infer carbon and nitrogen isotopic ratios. The rovibronic energies and transition probabilities were recalculated by explicitly incorporating mass-dependent diagonal Born–Oppenheimer corrections (DBOCs) into the semiempirical potential energy curves recently derived for the B , A , and X states for the main ¹² C ¹⁴ N isotopologue. For the X and A states, the radial DBOC functions were initially estimated during electronic structure calculations accomplished at the CCSDT/cc-pVDZ level of theory. The inclusion of the ab initio DBOCs significantly improves the accuracy of the A − X and B − X positions by reducing the root-mean-square error (RMSE) in the description of the experimental A − X and B − X lines of the ¹³ C ¹⁴ N [ ¹² C ¹⁵ N] isotopologues from 0.24 [0.15] and 0.16 [0.05] cm ⁻¹ to 0.04 [0.01] and 0.08 [0.05] cm ⁻¹ , respectively. A subsequent simultaneous adjustment of the DBOC functions for all three B , A , and X states to the experimental ¹³ C ¹⁴ N lines further decreased the RMSE of the predicted wavenumbers for the minor ¹³ C ¹⁴ N and ¹² C ¹⁵ N isotopologues to the spectroscopic level of accuracy. The new KTPSYT-iso line lists are made available via www.exomol.com .",
  "abstract_shown": true,
  "affiliations": [
    "Lomonosov Moscow State University",
    "University College London"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "V. A. Terashkevich",
      "orcid": "0000-0003-3844-3811"
    },
    {
      "affs": [
        0
      ],
      "name": "S. V. Kozlov",
      "orcid": "0000-0002-3619-5554"
    },
    {
      "affs": [
        0
      ],
      "name": "E. A. Pazyuk",
      "orcid": "0000-0003-0568-7801"
    },
    {
      "affs": [
        0
      ],
      "name": "A. V. Stolyarov",
      "orcid": "0000-0001-7046-7202"
    },
    {
      "affs": [
        1
      ],
      "name": "S. N. Yurchenko",
      "orcid": "0000-0001-9286-9501"
    },
    {
      "affs": [
        1
      ],
      "name": "J. Tennyson",
      "orcid": "0000-0002-4994-5238"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8awhe7br9ec6k.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4365/aea220",
  "fulltext_url": null,
  "id": "8awhe7br9ec6k",
  "issns": [
    "0067-0049",
    "1538-4365"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4365/aea220",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "1607|Spectroscopy and Laser Applications"
    ]
  ],
  "openalex": "W7223982739",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4365/aea220/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/8awhe7br9ec6k.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:15Z",
      "native_id": "10.3847/1538-4365/aea220",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4365/aea220"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:1607|Spectroscopy and Laser Applications",
      "subfield": "physical"
    }
  ],
  "title": "Improved Hot Line Lists for Minor CN Isotopologues in the X ² Σ ⁺ , A ² Π, and B ² Σ ⁺ Systems Using Diagonal Born–Oppenheimer Corrections",
  "title_text": "Improved Hot Line Lists for Minor CN Isotopologues in the X ² Σ ⁺ , A ² Π, and B ² Σ ⁺ Systems Using Diagonal Born–Oppenheimer Corrections",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:15Z",
  "url": "https://research.draconitic.com/paper/8awhe7br9ec6k",
  "venue": "The Astrophysical Journal Supplement Series",
  "versions": []
}