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Published February 2022 | Accepted Version + Published
Journal Article Open

Absolute measurements of state-to-state rotational energy transfer between CO and H₂ at interstellar temperatures

Abstract

Experimental measurements and theoretical calculations of state-to-state rate coefficients for rotational energy transfer of CO in collision with H₂ are reported at the very low temperatures prevailing in dense interstellar clouds (5–20 K). Detailed agreement between quantum state-selected experiments performed in cold supersonic flows using time-resolved infrared–vacuum-ultraviolet double-resonance spectroscopy and close-coupling quantum scattering calculations confirms the validity of the calculations for collisions between the two most abundant molecules in the interstellar medium.

Additional Information

© 2022 American Physical Society. (Received 1 October 2020; accepted 21 December 2021; published 23 February 2022) This work was supported by the Agence Nationale de la Recherche (ANR-HYDRIDES), Contract No. ANR-12-BS05-0011-01, by the Région de Bretagne and the French National Programme "Physique et Chimie du Milieu Interstellaire" (PCMI) of CNRS/INSU with INC/INP cofunded by CEA and CNES. D.C. would like to thank the Université de Rennes 1 for support via the Visiting Professor programme. L.M. thanks Rennes Metropole for a mobility grant, and the Office for Science and Technology of the Embassy of France in the United States for a Chateaubriand Fellowship. This work was also supported in part by the National Science Foundation under Grant No. CHE-1900551. P.J. acknowledges support from the National Science Centre of Poland under Grant No. 2017/25/B/ST4/01300.

Attached Files

Published - PhysRevA.105.L020802.pdf

Accepted Version - 2202.00342.pdf

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Additional details

Created:
August 20, 2023
Modified:
October 23, 2023