Untersuchung der Photoelektronen-Winkelverteilungen von ausgerichteten Molekülen in der Gasphase

Anielski, Denis; Küpper, Jochen; Rolles, Daniel

Book/Dissertation / PhD Thesis

PUBDB-2020-02797

Untersuchung der Photoelektronen-Winkelverteilungen von ausgerichteten Molekülen in der Gasphase

Anielski, D. (Corresponding author) ; Küpper, J. (Thesis advisor)CFEL*DESY* ; Rolles, D. (Thesis advisor)

2020
Verlag Deutsches Elektronen-Synchrotron Hamburg

Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 206 pp. (2020) [10.3204/PUBDB-2020-02797] = Dissertation, Universität Hamburg, 2020

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Please use a persistent id in citations: doi:10.3204/PUBDB-2020-02797

Report No.: DESY-THESIS-2020-018

Abstract: This work investigates if and how photoelectron diffraction might become a suitable tool to measure structural changes of small molecules in the gas-phase with femtosecond temporal and angstrom spatial resolution. Molecular-frame photoelectron angular distributions (MFPAD) of O(1$s$)-, S(2$p$)- and F(1$s$)-electrons from carbonyl sulfide and fluoromethane molecules have been measured in photoelectron-photoion coincidence experiments at the synchrotron radiation sources DORIS and PETRA III (kinetic energy of photoelectrons: 16 eV < E$_{\mathrm{PE}}$ < 283 eV). It has been investigated which degree of molecular orientation is necessary to observe a rich structure in the MFPADs, which influence linearly and circularly polarized photons have on MFPADs, and if MFPADs of photoelectrons with a few 100 eV kinetic energy can be described by a simple scattering model.The relation of the measured MFPADs to the molecular structure was examined by MSX$\alpha$ calculations. At the free-electron laser FLASH, S(2$p$)-photoelectron angular distributions of adiabatically laser-aligned OCS molecules have been measured (E$_{\mathrm{PE}}$=44 eV). In an IR-pump-XUV-probe experiment at FLASH, molecular dynamics have been observed in the photoelectron angular distributions with femtosecond temporal resolution. The influence of the alignment and the pump laser on molecules and on photoelectrons has been discussed. This work indicates avenues how to reach the goal of observing ultrafast molecular structural changes by photoelectron diffraction.

Note: Dissertation, Universität Hamburg, 2020

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