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Abstract:
In the course of this work dynamics in ionization processes of lithium
by photon and electron impact were studied. Due to its electronic structure, lithium
is an ideal candidate to examine electronic correlation effects and collision dynamics
of simple few-body systems. The lithium target is cooled in a magneto-optical trap
(MOT) down to the sub-millikelvin regime, which in combination with a reaction microscope
(ReMi) allows for the determination of the momentum information of all collision
products with unprecedented resolution. An electron gun serving as a new projectile
source was implemented in the MOTReMi experiment. From first measurements,
which showed that the developed setup is principally operational, time-of-flight and position
spectra were analyzed, determining the ratio of Li2+=Li+ ion creation. In a second
series of experiments, photoionization of laser-excited lithium has been investigated and
fully differential cross sections (FDCS) were examined. As the target and also the laser
beam were polarized, orientational effects could be studied. In some cases the electron
emission characteristics could directly be deduced from dipole selection rules.
