Computational rate coefficients of isocyanodiacetylene HC4NC by collisions with He and non-LTE modelling

Clicks: 14
ID: 329782
2026
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Emerging

Ranked #1,102 of 1,339 articles by views in monthly notices of the royal astronomical society

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 1,339 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
Abstract We present quantum close-coupling calculations for the rotational excitation of the interstellar molecule HC4NC by He collisions using a high-accuracy potential energy surface. State-to-state cross sections (for total energies E ≤ 200cm−1, J ≤ 20) and rate coefficients (for kinetic temperatures T = 2–40K) were calculated. De-excitation rate coefficients exhibit a clear propensity for even-ΔJ transitions. In particular, ΔJ = −2 transitions dominate over ΔJ = −1, maintaining large values (~10−11–10−10cm3 s−1) with weak J-dependence owing to the small rotational constant (B0 = 0.0467384cm−1). Scaling these rates for H2 collisions, we performed non-LTE radiative transfer modelling of HC4NC emission in TMC-1 (Tkin = 10 K). A χ2 minimisation yields n(H2) = 2.56 × 105 cm−3 and a column density N(HC4NC) = 4.78 × 1010 cm−2. This column density is a factor of ~6.3 lower than previous LTE estimates, demonstrating that sub-thermal excitation significantly impacts abundance derivations in cold dark clouds.
Reference Key
openalex_W7214356723 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors N Terzi, F Khadri, A Al-Ahmadi, K. Hammami, Haykel Elabidi
Are you one of these authors? Claim your profile
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1820
URL
https://doi.org/10.1093/mnras/stag1820
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.