Erlangen 2022 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 15: Poster 2

MO 15.18: Poster

Mittwoch, 16. März 2022, 16:30–18:30, P

Design and implementation of XUV setup for time resolved photoelectron spectrometry — •Marta Luisa Murillo-Sánchez, Constantin Walz, Dennis Mayer, and Markus Gühr — Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24/25, 14476 Potsdam-Golm Germany

To investigate photoinduced ultrafast relaxation processes in gas phase isolated molecules, a tabletop setup for time-resolved photoelectron spectroscopy employing ultrashort extreme ultraviolet pulses (XUV) is currently under construction in the laboratory of the Experimental Quantum Physics group at Potsdam University. High-energy XUV pulses obtained by high order generation are achieved by focusing a fraction of the output pulses from an amplified laser system into a cell filled with a rare gas, under proper phase matching conditions. The odd frequency comb constituted by several harmonics is two-step filtered by a silicon wafer and an aluminium bandpass metallic filter to remove the residual infrared radiation. Afterwards, the beam is sent to a toroidal mirror to focus the beam. The different harmonics are spatially separated by a diffraction grating allowing to individually select them by means of a slit. This system for obtaining monochromatic XUV pulses is perhaps the simplest possible nevertheless compromising the optimum temporal duration of the pulses. Focused XUV laser pulses interact with an evaporated sample by an oven in the interaction region of a magnetic bottle spectrometer through which photoelectrons are detected with increased efficiency. XUV pulses can also be recombined with UV pulses in order to perform pump-probe experiments.