Bonn 2025 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 15: Interaction with VUV and X-ray Light I (joint session A/MO)

MO 15.1: Vortrag

Mittwoch, 12. März 2025, 11:00–11:15, GrHS Mathe

High-resolution photoelectron spectroscopy with broad bandwidth pulses from high-harmonic sources — •Sarang Dev Ganeshamandiram¹, Tobias Witting², Ulrich Bangert¹, Daniel Uhl¹, Lauren Drescher², Benjamin Maingot², Oleg Kornilov², Frank Stienkemeier¹, Marc J.J. Vrakking², and Lukas Bruder¹ — ¹Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany — ²Max-Born-Institut, Max-Born-Str. 2A, 12489 Berlin, Germany

Extreme ultraviolet time-resolved photoelectron spectroscopy (XUV-TRPES) is a promising emerging method to study molecular dynamics. However, XUV pulses generated by high harmonic generation (HHG) exhibit very broad spectra, which leads to low spectral resolution in PES experiments, especially involving molecules.
Here, we explore a new approach of Fourier-Transform (FT) based XUV-PES that provides high spectral resolution, while temporal resolution is retained. This approach avoids the photon broadening problem and can disentangle the photoelectrons produced by different harmonics within the HHG spectrum. As model systems serve Rb atoms, and N₂ and O₂ molecules.

Keywords: Photoelectron spectroscopy (PES); XUV; High-harmonic generation (HHG); TRPES; Fourier Transform spectroscopy