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Candidate:
Marco Wiedenhoeft
Degree of:
Doctor of Philosophy
Department: Physics
Title: Double Photoionization of Atoms
Committee:
Dr. Nora Berrah, Chair
Dr. Thomas Gorczyca
Dr. Emanuel Kamber
Dr. Steve Southworth (ANL)
Dr. John Tanis
Date: Wednesday,
July 2, 2003, 2:00 p.m.-5:00 p.m.
Bradley Commons, Rm. 2202, Everett Tower
Abstract:
Double photoionization studies of atoms and molecules
are new state-of-the-art studies providing a deeper knowledge of multi-electron
excitations. This type of work advances the understanding of many-body
problems.
Double photoionization of atoms is of great interest to learn about
electron-electron correlation and relaxation effects in atoms and molecules.
In order to study double photoionization processes, a new electron-electron
coincidence apparatus was built to carry out the measurements. I will
present the apparatus I built as well as the results of the measurement
of the triply-differential-cross-section (TDCS) for the predicted interference
and Post-Collision-Interaction (PCI) effects in the Xenon N5O2,3 O2,3
Auger decay after 4d5/2 photoionization. Furthermore I present measurements
for direct double photoionization of Helium at various photon energies.
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