Multiple-electron capture in close nearly symmetric ion-atom collisions
A S Schlachter; E M Bernstein; M W Clark; R D DuBois; W G Graham; R H McFarland; T J Morgan; D W Mueller; K R Stalder; J W Stearns; M P Stockli; J A Tanis; A S Schlachter; Lawrence Berkeley, Lab., Berkeley, CA, USA; E M Bernstein; Lawrence Berkeley, Lab., Berkeley, CA, USA; M W Clark; Lawrence Berkeley, Lab., Berkeley, CA, USA; R D DuBois; Lawrence Berkeley, Lab., Berkeley, CA, USA; W G Graham; Lawrence Berkeley, Lab., Berkeley, CA, USA; R H McFarland; Lawrence Berkeley, Lab., Berkeley, CA, USA; T J Morgan; Lawrence Berkeley, Lab., Berkeley, CA, USA; D W Mueller; Lawrence Berkeley, Lab., Berkeley, CA, USA; K R Stalder; Lawrence Berkeley, Lab., Berkeley, CA, USA; J W Stearns; Lawrence Berkeley, Lab., Berkeley, CA, USA; M P Stockli; Lawrence Berkeley, Lab., Berkeley, CA, USA; J A Tanis; Lawrence Berkeley, Lab., Berkeley, CA, USA
Журнал:
Journal of Physics B: Atomic, Molecular and Optical Physics
Дата:
1988-06-14
Аннотация:
Cross sections for capture of two to five electrons are found to exceed the cross section for capture of a single electron for close collisions of 47 MeV Ca<sup>17+</sup> ions with Ar atoms. Close collisions are selected by coincident detection of a Ca K or Ar K X-ray and a Ca ion that has undergone electron capture. The corresponding electron capture charge-state distribution can be fitted with a binomial distribution, which is consistent with independent electron-capture and suggests an absence of electron correlation in the multiple-electron capture process. Total electron capture cross sections, in which close collisions are not selected, are found to be much larger than the X-ray coincidence cross sections, and to decrease monotonically with increasing number of electrons captured.
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