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METHODS=A08-m3

Atomic beam techniques[Particulars on this technique in the Experimental methods (link type: 'contains/segregated in/is detailed in/focused in/sq-next': target: A08-m3a)] are used to measure the experimental differential cross sections of the chemi-ionization in sodium atom-iodine atom collisions in the electronvolt range.

We interpret the experimental methods thus obtained using the following theoretical methods [These methods are grouped in the module Theoretical methods (link type: 'contains/segregated in': target: A08-m3c)]. We try to explain this chemi-ionization process by means of a semiclassical atom-atom model for ion-pair formation[Particulars on the model in the Theoretical methods (link type: 'contains/segregated in/is detailed in/focused in': target: A08-m3ci)], which is based on transitions between electronically coupled states of the system, in particular Landau-Zener transitions[Focus on the LZ transitions in a Theoretical methods module (link type: 'contains/segregated in/specialised in/is detailed in/focused in': target: A08-m3ci1)]. In addition, the phenomenon of rotational coupling is taken into account[Focus on rotational coupling in a Theoretical methods module(link type: 'contains/segregated in/specialised in/is detailed in/focused in': target: A08-m3ci2)]. The differential cross sections are calculated, from the states of the system, via the deflection function, using the stationary phase approximation, the uniform approximation and JWKB phase shifts [Particulars on the calculation methods in the Theoretical methods (link type: 'contains/segregated in/is detailed in/focused in': target: A08-m3cii)].