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Findings=A05-m6a

The relative differential cross sections for chemi-ionisation of the systems K + BR2 at initial relative kinetic energies of 10.35 and 6.9 eV, K + I2 at 11.15 eV and Li + BR2 at 6.25 eV have been measured [ (link type: 'To the module (link type: depends on/detailed in'; target:  treated results A05-m4b] in molecular beam experiments [ (link type: 'To the module (link type: depends on/detailed in'; target:  experimental methods A05-m3a].

The general shape of the measured cross sections can be explained qualitatively using a classical atom-atom-Zener model, via the general shape of the deflection function [ (link type: 'arguments found in'; target:  qualitative interpretation m5ai]. A classical explanation suffices, except for small angles, where a quantum explanation is necessary [ (link type: 'arguments found in'; target:  qualitative interpretation m5aii].

The relative differential cross section has been calculated for the inelastic-collision process K + Br2 K+ + (Br + Br-) . The calculation is based on a simple classical model, using impact-parameter approximation, an isotropic intermolecular potential and neglecting the internal states of the X2 molecule [ theoretical methods (link type: 'used in/detailed in; target: A05-m3c], and based on the potential of the system which has been determined via fitting.

These measurements do seem to be suitable for the determination of potential parameters, crossing distance and resonance energy at the crossing point [ (link type: 'arguments found in'; target: A05-m5bi].

However, the classically calculated differential cross sections are only in qualitative agreement [ (link type: 'arguments found in'; target:  quantitative interpretation A05-m5bii] with the measurements [ (link type: 'depends on'; target:  A05-m4]. Quantative agreement is poor, because the assumed simplifications of an isotropic potential and the absence of internal state are invalid for the systems at hand.

Thus, in answer to the central question of this article [ (link type: 'depends on/detailed in'; target:  central problem A05-m2b], the differential cross section of chemi-ionisation of alkali halides have been measured and explained qualitatively using a simple classical system, but a quantitative explanation of the reaction dynamics has not been found.