Rotational energy transfer in collisions between CO and Ar at temperatures from 293 to 30 K

Laura A. Mertens (1, 2) , Hamza Labiad (2) , Otoniel Denis-Alpizar (3, 4) , Martin Fournier (2) , David Carty (5) , Sébastien D. Le Picard (2) , Thierry Stoecklin (4) , Ian R. Sims (2)

1 CALTECH - California Institute of Technology
2 IPR - Institut de Physique de Rennes
3 Universidad Autonoma de Chile
4 ISM - Institut des Sciences Moléculaires
5 Department of Chemistry

Experimental measurements and theoretical calculations are reported for rotational energy transfer in the Ar-CO system. Experiments were performed in cold uniform supersonic flows of Ar, using an infrared - vacuum ultraviolet double resonance technique to measure absolute state-to-state rate constants and total relaxation cross sections for rotational energy transfer within the (v = 2) vibrational state of CO in collision with Ar at temperatures from 30.5 to 293 K. Close-coupling calculations were also performed using a recent potential energy surface (Sumiyoshi and Endo, 2015). Very good agreement is obtained between measured and calculated values.

Mots clés: Molecular physics

Domaines: Chimie-Physique [physics.chem-ph]; Physique [physics]

Laura A. Mertens, Hamza Labiad, Otoniel Denis-Alpizar, Martin Fournier, David Carty, et al.. Rotational energy transfer in collisions between CO and Ar at temperatures from 293 to 30 K. Chemical Physics Letters, 2017, 683, pp.521-528. ⟨10.1016/j.cplett.2017.05.052⟩. ⟨hal-01578397⟩