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Situation=A05-m2a

In recent years several measurements have been performed for total cross sections for chemi-ionisation in the inelastic-collision processes A + B A+ + B- as well as for the inverse neutralization [ (link type: 'elaborated in/ external'; target:  Helbing-m1, Compton-m1, Weiner-m1, Moseley-m1 (elaborated in/wider range/corpus'; target:  T2]. In the research programme from which this article issues [ (link type: 'elaborated in/wider range/corpus'; target:  situation MESO-m2a], total cross sections have been measured, using electronvolt molecular beam techniques [ (link type: 'detailed in/focused on in/wider range/corpus'; target:  MESO-m3a], for collisions between alkali atoms and halogen molecules [ (link type: 'elaborated in/corpus'; target:  A01-m1], alkali atoms and [ (link type: 'elaborated in/corpus'; target:  A02-m1], alkali atoms and , and [ (link type: 'elaborated in/corpus'; target:  A03-m1]. The total cross sections of alkali atoms and and have also been measured as a function of the secondary beam temperature [ (link type: 'elaborated in/corpus'; target:  A04-m1].

These cross sections are interpreted tentatively in terms of a simple atom-atom model [ (link type: 'detailed in/focused on in/wider range/corpus'; target:  MESO-m3c-mod], according to which the transition to the ionic state takes place via a crossing of the neutral and ionic ground states, which is passed twice in a collision. The transition probability is given by the Landau-Zener formula.

Here we report the relative differential cross sections of some alkali atom-halogen molecule charge-transfer collisions [ (link type: 'focused on in/used in/sq-next/essay-next'; target:  central problem A05-m2b].