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Beyond the helium buffer: 12C−2 rotational cooling in cold traps with H2 as a partner gas: interaction forces and quantum dynamics
Abstract
abstract = { The scattering cross-sections and corresponding rate coefficients for rotationally inelastic collisions of $^{12}$C$_2$^-$ ($^2 \Sigma_g^+$) with H$_2$ ($^1 \Sigma_g^+$) 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 H$_2$ 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.
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Authors (4)
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Barry P. Mant
- Department of Chemistry, University College London, London, UK
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Roland Wester
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria
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Francesco Antonio Gianturco
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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MOLECULAR PHYSICS
no. 119,
ISSN: 0026-8976 - Language:
- English
- Publication year:
- 2021
- Bibliographic description:
- Mant B. P., Franz J., Wester R., Gianturco F. A.: Beyond the helium buffer: 12C−2 rotational cooling in cold traps with H2 as a partner gas: interaction forces and quantum dynamics// MOLECULAR PHYSICS -Vol. 119,iss. 17-18 (2021),
- DOI:
- Digital Object Identifier (open in new tab) 10.1080/00268976.2021.1938267
- Sources of funding:
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- WCSS (Wroclawskie Centrum Sieciowo-Superkomputerowe, Politechnika Wroclawska), grant n. KDM-408
- Austrian Science Fund (FWF), Project No. P29558-N36
- Verified by:
- Gdańsk University of Technology
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