Fitting form for rotational transitions of large inelasticity

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The A over N (AON) fitting form for rotational transfer in diatomic molecules relies on the energy sudden approximation. We show that by making the proper choice of the sudden kinetic energy (the lowest value of the entrance and exit channels), the energy dependent expression [AON(E)] of this model: σl→0(εl) =(αγ/n)[ln(α/n(εl)1/2) −1+n(εl)1/2/α] can be used to interpret experimental data involving transitions of large inelasticity. This is illustrated using the CsH–H2 system which Ferray et al. have experimentally investigated [M. Ferray, J. P. Visticot, and B. Sayer, J. Chem. Phys. 81, 3009 (1984)]. Very good agreement is found with the experiment both in the case of selecting the initial level J=0 and J=10.