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Interpretation=A08-m5

The differential cross sections [experimental results given in Treater results module (link type: 'DEPENDS ON'; to: A08-m4bi)] for chemi-ionization in Na + I Na+ + I- collisions are explained qualitatively [details qualitative interpretation in constituent module Qualitative interpretation (link type: 'CONTAINS/specialised in/is detailed in/focused in/sq-next'; to: A08-m5a)] , via the general shape of the deflection function [calculation method via deflection given in Theoretical methods link type: 'DEPENDS ON'; to: A08-m3cii)] , with a semi-classical atom-atom model for ion pair formation in molecular collisions [model given in Theoretical methods module (link type: 'DEPENDS ON'; to: A08-m3ci1)] .

In order to interpret the results quantitatively [quantitative interpretation in constituent module Quantitative interpretation (link type: 'CONTAINS/specialised in'; to: A08-m5b)] , the potential parameters and the classical deflection function of the system are determined by fitting the results calculated according to the model with the experimental results [determining the potential and the deflection function in constituent module Quantitative interpretation (link type: 'CONTAINS/specialised in/segregated in/is detailed in/focused in'; to: A08-m5bi)] . Based on the potential parameters and the deflection function thus determined, the absolute values of the differential cross section of the collision are calculated and compared to the measurements [determining the theoretical cross section in constituent module Quantitative interpretation (link type: 'CONTAINS/specialised in/segregated in'; target: A08-m5bii)] . The comparison between the experimental and the theoretical cross sections in the fitting procedure is facilitated by the rainbow and the Stueckelberg structure.

Because of a serious disagreement between theory and experiment [details quantitative interpretation in constituent module Quantitative interpretation (link type: 'CONTAINS/specialised in/segregated in/is detailed in/focused in'; target: A08-m5bii1)] , a new quantitative interpretation is given, based on an extension of the model: not only the Landau-Zener coupling, but also the rotational coupling is taken into account [details second quantitative interpretation in constituent module Quantitative interpretation (link type: 'CONTAINS/specialised in/segregated in/is detailed in/focused in'; to: A08-m5bii2)] [extension of the model given in Theoretical methods (link type: 'depends on'; to: A08-m3ci2)].