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要旨:
The course of experiments reported in this work is dedicated to give insight into
the collision dynamics between electrons and small rare gas clusters. Kinematically
complete (e, 2e) experiments were performed for the ionization of argon dimers and
small argon clusters with 100 eV impact energy. Compared to parallel measured
data for atomic argon, the cross-sections reveal a significant probability of additional
elastic scattering processes for increasing target size. In a second experiment
61 eV electrons were used to ionize neon dimers. The obtained triple-differential
cross-sections show distinct differences in form of lobes that are not observed for
the simultaneously obtained atomic cross-sections. These give first indications for
the influence of molecular orbitals symmetries in the ionization process in dimers.
Furthermore, the dissociation of argon dimers into two charged fragments was studied by 120 eV electrons. The fragmentation into two singly-charged ions reveals two different pathways: one by sequential ionization, the other by double ionization of
one constituent and a subsequent radiative decay process. The triply-charge final
state, could be assigned to interatomic coulombic decay, an ultra-fast process closely
related to the Auger decay. For all studied channels angular distributions of the ionic
fragments as well as for the emitted electrons are presented.
