Regensburg 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 23: Poster Ultrafast Electron Dynamics

O 23.9: Poster

Montag, 17. März 2025, 18:00–20:00, P2

XUV pulses with variable photon energy, pulse duration and bandwidth for time-resolved ARPES — •Isabella Alexandra Hofmeister, Niklas Hofman, Michael Schildbach, and Isabella Gierz — University of Regensburg, Regensburg, Germany

Time- and angle-resolved photoemission spectroscopy (trARPES) provides an unprecedented view on non-equilibrium quasiparticle dynamics and band structures in momentum space. Extreme ultraviolet (XUV) pulses generated by high harmonics generation (HHG) in noble gases are usually required to gain access to the complete first Brillouin zone. HHG yields a broad spectrum containing all the odd harmonics of the driving frequency up to a cut-off energy determined by the intensity and frequency of the drive. Therefore, a single harmonic is typically selected for trARPES using grating monochromators, multilayer mirrors, or a combination of filters. We compare different approaches implemented in a single trARPES setup with respect to their bandwidth and pulse duration and present strategies to enable complementary trARPES measurements with either good energy or good temporal resolution.

Keywords: trARPES; ultrafast electron dynamics; energy resolution; temporal resolution