Doubly autoionizing capture resonances ine + Mg+ collisions |
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Authors: | A Müller G Hofmann K Tinschert B Weißbecker E Salzborn |
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Institution: | 1. Institut für Kernphysik, Strahlenzentrum der Justus-Liebig-Universit?t, D-6300, Giessen, Germany
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Abstract: | Fine details in the cross section for electron impact ionization of Mg+ ions (configuration 1s 2 2s 2 2p 6 3s) have been measured with an energy resolution of 0.3 eV. Structure on top of a smooth direct-ionization “background” reflects the presence of indirect ionization mechanisms. Such contributions in a Na-like ion involvenon-resonant excitation of a 2p electron to singly autoionizing intermediate states subsequently decaying into the channel of net single ionization of the parent ion. We observe even stronger indirect contributions fromresonant excitation of a 2p electron with simultaneous dielectronic capture of the projectile electron into doubly autoionizing states which decay by successive emission of two electrons. |
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