Quantum dynamics of C7N− and C10H− anions in collision with H2 at interstellar medium conditions

We present quantum calculations for two of the longest linear anions, recently detected in the interstellar environments: C7N- and C10H-, in collision with the most abundant neutral partner in the same environment: the H2 molecule. The interaction forces are obtained from accurate ab initio calculations for the two partners as rigid rotors, generating a dense grid of potential energy values in four dimensions. The potential energy surface is, in turn, fitted by using high-level neural network procedures, and multipolar expansion coefficients are obtained to provide input for calculations of the collision-induced rotational energy transfer processes at the temperatures of interstellar environments. Cross sections are used to generate state-to-state inelastic rate coefficients up to 50 K. The results for the cases of ortho- and para-H2 as collision partners are discussed and analyzed.

Authors

Institutions

Publication Details

Journal
The Journal of Chemical Physics
Published
2025-10-28
DOI
https://doi.org/10.1063/5.0292750
Primary Topic
Astrophysics and Star Formation Studies
Type
article
Field-Weighted Citation Impact
0.00
Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Quantum dynamics of C7N− and C10H− anions in collision with H2 at interstellar medium conditions

Upakarasamy Lourderaj, Roland Wester, Franco Antonio Gianturco, Alberto Martín Santa Daría et al.
The Journal of Chemical Physics
Astrophysics and Star Formation Studies
article

Quantum dynamics of C7N− and C10H− anions in collision with H2 at interstellar medium conditions

Upakarasamy Lourderaj, Roland Wester, Franco Antonio Gianturco, Alberto Martín Santa Daría, Lola González‐Sánchez, Kousik Giri, Ersin Yurtsever, N. Sathyamurthy, Sahil Rana
article en

Abstract

We present quantum calculations for two of the longest linear anions, recently detected in the interstellar environments: C7N- and C10H-, in collision with the most abundant neutral partner in the same environment: the H2 molecule. The interaction forces are obtained from accurate ab initio calculations for the two partners as rigid rotors, generating a dense grid of potential energy values in four dimensions. The potential energy surface is, in turn, fitted by using high-level neural network procedures, and multipolar expansion coefficients are obtained to provide input for calculations of the collision-induced rotational energy transfer processes at the temperatures of interstellar environments. Cross sections are used to generate state-to-state inelastic rate coefficients up to 50 K. The results for the cases of ortho- and para-H2 as collision partners are discussed and analyzed.

The Journal of Chemical PhysicsVol. 163(16)
Central University of Punjab (IN), Koç University (TR), National Institute of Science Education and Research (IN), Indian Institute of Science Education and Research Mohali (IN), Universidad de Salamanca (ES), Universität Innsbruck (AT)
Openalex Percentile: Top 78%
Astrophysics and Star Formation Studies
DOISourceOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.