Pith Number

pith:O5CW7OIE

pith:2026:O5CW7OIEU6UGWEYENO33AKCY62

not attested not anchored not stored refs resolved

Observation of spontaneous N-bearing PAH formation using ion trap: a new formation pathway in the interstellar medium

G. Aravind, Krishna R. Nandipati, Nihar Ranjan Behera, Pratikkumar Thakkar, Ruth Ann Mathews, Saurav Dutta, Shiv Gupta, Siddhartha S. Payra, Yash Lenka

Barrierless reactions between pyrimidine cations and acetylene form new endocyclic N-PAHs.

arxiv:2605.14424 v1 · 2026-05-14 · astro-ph.GA · physics.chem-ph

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\usepackage{pith}
\pithnumber{O5CW7OIEU6UGWEYENO33AKCY62}

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Record completeness

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2 Internet Archive

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4 Citations open

5 Replications open

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Claims

C1strongest claim

Employing an ion trap technique and electronic structure calculations, we unravel multiple barrier-less reactions between gas-phase pyrimidine cations (C4H4N2+) and acetylene (C2H2) which form an hitherto unreported endocyclic- N-PAHs (C8H7N2+).

C2weakest assumption

That the ion trap experimental conditions (temperature, pressure, and ion energies) sufficiently replicate the low-temperature, low-density regime of the interstellar medium so that the observed barrierless behavior translates directly to astrophysical environments.

C3one line summary

Ion trap experiments and calculations show barrierless formation of endocyclic N-PAHs (C8H7N2+) from pyrimidine cations reacting with acetylene, proposing a new pathway in astrochemistry.

References

47 extracted · 47 resolved · 0 Pith anchors

[1] This addition is followed by a critical transfer of a hydrogen atom from the aromatic ring to the acetylene chain through transition stateTS-1, ultimately yielding the first detectable product (P-1) a

[2] Li, Spitzer’s perspective of polycyclic aromatic hydrocarbons in galaxies.Nature Astronomy 4(4), 339–351 (2020) 2020

[3] L. Allamandola, C. Boersma, T. Lee, J. Bregman, P. Temi, PAH Spectroscopy from 1 to 5𝜇m. The Astrophysical Journal Letters917(2), L35 (2021) 2021

[4] A. L. Mattioda,et al., Near-infrared spectroscopy of nitrogenated polycyclic aromatic hydro- carbon cations from 0.7 to 2.5𝜇m.The Astrophysical Journal680(2), 1243 (2008) 2008

[5] Peeters,et al., The rich 6 to 9 m spectrum of interstellar PAHs.Astronomy & Astrophysics 390(3), 1089–1113 (2002) 2002

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-17T23:39:07.209858Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

77456fb904a7a86b13046bb7b02858f6a82a85b986ece98c2f7821da6f32a3d9

Aliases

arxiv: 2605.14424 · arxiv_version: 2605.14424v1 · doi: 10.48550/arxiv.2605.14424 · pith_short_12: O5CW7OIEU6UG · pith_short_16: O5CW7OIEU6UGWEYE · pith_short_8: O5CW7OIE

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/O5CW7OIEU6UGWEYENO33AKCY62 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 77456fb904a7a86b13046bb7b02858f6a82a85b986ece98c2f7821da6f32a3d9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1323fe980e5875db1a85375ee007131af778a7e39aaf9e85fd904cdf2aa9d5b4",
    "cross_cats_sorted": [
      "physics.chem-ph"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-05-14T06:14:07Z",
    "title_canon_sha256": "d9b3261ddb90011bc6cb1de2fcfa2847312e03cb1b36d23df2920c0acc0c05b7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.14424",
    "kind": "arxiv",
    "version": 1
  }
}