Beyond the helium buffer: 12C−2 rotational cooling in cold traps with H2 as a partner gas: interaction forces and quantum dynamics - Publication - MOST Wiedzy

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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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Details

Category:
Articles
Type:
artykuły w czasopismach
Published in:
MOLECULAR PHYSICS no. 119, pages 1 - 16,
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, (2021), s.1-16
DOI:
Digital Object Identifier (open in new tab) 10.1080/00268976.2021.1938267
Sources of funding:
  • 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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