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Leads for further research=A08-m6b

The process of chemi-ionization in alkali atom-halogen atom collisions in the eV range can be explained with an atom-atom model for ion-pair formation [particulars in the model in a mesoscopic Theoretical methods module (link type: 'is detailed in/wider range/project'; target: MESO-m3c-mod)] , via potential curve crossing by means of the Landau-Zener coupling and rotational coupling [This is concluded in the Findings (link type: 'is detailed in/clarified in/depends on/sq-back/es-back'; target: A08-m6a)].

The question now is how to explain the process of charge transfer in more complicated, molecular, collisions, e.g. between alkali atoms and halogen molecules. This process cannot be described quantitatively with the atom-atom model

In a molecular charge transfer reaction, there may not only be a correlation between the transfer of the electron and the intermolecular motions of the nuclei, but also between the electron transfer and the intramolecular motions M + XY M++ (X...Y)-. The electron transfer itself can be considered instantaneous, compared to the other velocities involved. However, the time between the two passages of the crossing between the atom M and the molecule XY may be large enough for the bond of the XY- molecule (which is formed at the first crossing) to stretch.

Therefore the influence of vibration on the electron transfer, i.e. the vibronic coupling at intersections of covalent and ionic states, has to be studied systematically.