Abstract
Transfer excitation (TE) in ion‐atom collisions is reviewed from the perspective of the present status and current problems. The TE process occurs when electron capture (transfer) and projectile excitation occur together in a single collision, and three modes of TE are identified. A single electron‐electron interaction can lead to resonant transfer excitation (RTE), while independent electron‐nucleus interactions cause nonresonant transfer excitation (NTE) and separate electron‐electron and electron‐nucleus interactions give rise to uncorrelated transfer excitation (UTE). RTE is closely related to dielectronic recombination (DR) and can be used to provide important tests of theoretical calculations for this fundamental recombination process. Measurements of RTE as a function of projectile atomic number and charge state are compared with theory and discrepancies noted. Some of the discrepancies can be explained in terms of NTE or UTE while in other cases the discrepancies are as yet unresolved.
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