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Collisional rate coefficients for astrophysics

Published online by Cambridge University Press:  19 March 2024

Alexandre Faure Open the ORCID record for Alexandre Faure [Opens in a new window]
Alexandre Faure*
Affiliation:
Univ. Grenoble Alpes, CNRS, IPAG F-38000 Grenoble,France
*
email: [email protected]
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Abstract

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In the interstellar medium, inelastic collisions are so rare that they cannot maintain a local thermodynamical equilibrium (LTE). Atomic and molecular populations therefore do not follow a simple Boltzmann distribution and non-LTE spectra are the rule rather than the exception. In such conditions, accurate state-to-state collisional data are crucial for a quantitative interpretation of spectra. In recent years, considerable progress has been made in quantum calculations of inelastic cross sections for a variety of targets, types of transitions and projectiles. For a few benchmark species, detailed comparisons between theory and experiment were also carried out at the state-to-state level and in the quantum regime. In this article, we highlight such comparisons for three important molecules: CO, H2O and CH+. We also describe current computational efforts to extend these advances to ever larger targets, new transition types, and new environments (e.g. stellar envelopes or cometary atmospheres).

Keywords

Molecular datamolecular processesscattering
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S371: Honoring Charlotte Moore Sitterly: Astronomical Spectroscopy in the 21st Century , August 2022 , pp. 123 - 132
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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