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[Show the characterisation of the module]
[To the Map of contents]
[Show the navigation menu of the module]
[Step back on the ESSAY-TYPE sequential path: to the module Central problem (link type: ESSAY-BACK/sq-back; target: MESO-m2a)] [Next step on the ESSAY-TYPE sequential path: to the module Central problem (link type: ESSAY-NEXT/sq-next; target: MESO-m2b)]
[Step back on the COMPLETE sequential path to the module Positioning (link type: SQ-BACK/es-back; target: MESO-m2a)] [Next step on the COMPLETE sequential path: to the module Acknowledgements (link type: SQ-NEXT/essay-next; target: MESO-m2b)]

Central problem, mesoscopic = MESO-m2b

In this project, charge transfer is studied in atom-atom and atom-molecule collisions between alkali atoms and electronegative atoms and molecules (especially halogen compounds). Total and differential cross sections of these chemi-ionisation reactions are measured in beam experiments in the eV range [The experimental methods are elaborated in a mesoscopic module (link type: `elaborated in/clarified in/project'; target MESO-m3a)]. In these experiments the transfer of an electron in this type of collisions, i.e. the initiation of the harpoon mechanism [The background against which this problem is set is sketched in a mesoscopic module (link type: 'elaborated in/project'; target: MESO-m2a)] is considered. A model [The model is clarified in the a mesoscopic <i>Theoretical methods</i> module (link type: `elaborated in/clarified in/project' target: MESO-m3c-mod)] is tested qualitatively in atom-molecule collisions, reducing the problem to an atom-atom interaction by neglecting the vibrational and rotational coordinates of the molecule; for the motion of the heavy particles the impact parameter approximation is used, while the electron transfer is described by the Landau-Zener model. In the atom-atom case, a semi-quantal description is used for a description of the interference effects with the Landau-Zener approximation for the electron transfer.