Mant, B;
Franz, J;
Wester, R;
Gianturco, FA;
(2021)
Beyond the helium buffer: C-12(2)- rotational cooling in cold traps with H-2 as a partner gas: interaction forces and quantum dynamics.
Molecular Physics
10.1080/00268976.2021.1938267.
(In press).
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Abstract
The scattering cross-sections and corresponding rate coefficients for rotationally inelastic collisions of 12 C−2 (2Σ+g) with H2 (1Σ+g) are presented over a broad range of cold-trap temperatures. They have been calculated using quantum scattering theory that employs a new ab initio potential energy surface. The rate coefficients for the inelastic processes in the anionic partner are used to model the thermalisation dynamics of 12 C−2 using H2 as a buffer gas, a trap partner which is found here to be far more efficient than the typical buffer gas He and even more so than when using Ar as a partner gas. The microscopic physics underlying these findings is discussed in some detail. We additionally compute and discuss 12 C−2 quadrupole transitions by spontaneous emission and use the newly computed rates to show that the anion's rotational levels should be in local thermal equilibrium at typical interstellar conditions.
Type: | Article |
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Title: | Beyond the helium buffer: C-12(2)- rotational cooling in cold traps with H-2 as a partner gas: interaction forces and quantum dynamics |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1080/00268976.2021.1938267 |
Publisher version: | https://doi.org/10.1080/00268976.2021.1938267 |
Language: | English |
Additional information: | © 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
URI: | https://discovery.ucl.ac.uk/id/eprint/10130019 |
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