Atom–molecule interactions from multiproperty analysis. An integrated study of the dynamics for oxygen–rare-gas systems

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Abstract
The interaction potential between the ground electronic state of the oxygen molecule and the helium atom is obtained through a numerical fit of data from collision experiments and is given via an effective, spherically symmetric analytic form. The latter expression, together with similar ones obtained previously for the O2–Ar and O2–O2 systems, is then used within a quantum-mechanical model to treat vibrationally inelastic processes and to generate various partial integral cross-sections at several energies. A comparison with experimental relaxation data is then carried out for the three cases examined; the results show generally good agreement for the He–O2 and Ar–O2 systems, suggest a greater influence of rotational inelasticity for the O2–O2 case and allow us to assess the importance of Van der Waals complex formation on the relaxation mechanism.

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