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Absolute measurements of state-to-state rotational energy transfer between CO and H-2 at interstellar temperatures

Abstract : Experimental measurements and theoretical calculations of state-to-state rate coefficients for rotational energy transfer of CO in collision with H-2 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.
Keywords : Molecular physics
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Submitted on : Friday, May 6, 2022 - 3:23:15 PM
Last modification on : Friday, May 6, 2022 - 6:11:34 PM
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Hamza Labiad, Martin Fournier, Laura A. Mertens, A Faure, David Carty, et al.. Absolute measurements of state-to-state rotational energy transfer between CO and H-2 at interstellar temperatures. Physical Review A, American Physical Society 2022, 105 (2), pp.L020802. ⟨10.1103/PhysRevA.105.L020802⟩. ⟨hal-03629790⟩

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