Double Ionization of Helium by Electron Impact: A Study of the Two-Step Mechanism
direct process consisting to a simultaneous double ionization of two electrons via different mechanisms
indirect process resulting of an ionization of a single inner-shell electron followed by Auger decay
resonant processes in collisions with positive ions referred to as-called resonant excitation-autoionization process which lead to a final emission of three electrons (the incident one is captured by the target ion and ejected with two target electrons).
KeywordsScattered Electron Incident Electron Born Approximation Double Ionization Target Electron
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