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Tomographische Rekonstruktion dreidimensionaler Photoelektronenverteilungen mittels intra-cavity Velocity Map Imaging

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Wössner,  Valentin
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Wössner, V. (2020). Tomographische Rekonstruktion dreidimensionaler Photoelektronenverteilungen mittels intra-cavity Velocity Map Imaging. Bachelor Thesis, Ruprecht-Karls-Universität, Heidelberg.


Cite as: http://hdl.handle.net/21.11116/0000-0007-5AD5-4
Abstract
The invetigation of multiphoton ionization (MPI) in a purely perturbative regime at low intensities requieres fast data acquisition. Combining a 100 MHz frequency comb (FC) amplified in a femtosecond enhancement cavity (fsEC) with intra-cavity velocity map imaging (VMI) technique enables such measurements. This bachelor thesis deals with tomographic reconstruction of photoelelectron momentum distrubutions, without the need of any symmetry assumptions. Therefor, a suitable filtered backprojection (FBP) algorithm was presented and the VMI was successfully characterized. Due to high intensity sensitivity of MPI a polarization dependency of the intra-cvity enhancement was investigated and slight deviations of a few percent were found.