Mainz 2026 – scientific programme

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MO: Fachverband Molekülphysik

MO 30: Poster – Molecular Spectroscopy

MO 30.10: Poster

Thursday, March 5, 2026, 17:00–19:00, Philo 1. OG

Design for a monochromatic, high-repetition-rate XUV beamline for time-resolved photoelectron-photoion coincidence spectroscopy — •Merline Cherukarathadathil Ulahannan, Ulrich Bangert, and Sebastian Hartweg — Institute of Physics, University of Freiburg, Freiburg, Germany

We present our plans for a monochromatic XUV beamline with high-repetition rates of up to 120 kHz for time-resolved photoelectron photoion coincidence spectroscopy. The beamline will be based on a cascaded harmonic generation scheme [1] driven by an Yb Laser. The 800 μJ near IR pulses will be first spectrally broadened by self-phase modulation in a gas-filled multipass cell and compressed to ~40 fs before the second and third harmonic of the 1030 nm fundamental are generated in a set of BBO crystals. The resulting visible and ultraviolet laser pulses will be used to efficiently drive the HHG process in a gas jet producing XUV radiation in the range between 12 and 20 eV. After separation of the XUV from the driving field we will use a time-preserving monochromator [2] with a single plane diffraction grating in off-plane geometry for spectral selection while maintaining pulse durations of tens of femtoseconds. A home-built nonlinear optical parametric amplifier pumped by the same Yb Laser will supply frequency-tunable ultrashort pump pulses in the visible and UV spectral range. This beamline will be used in performing time-resolved XUV photoelectron-photoion coincidence spectroscopy in molecular complexes. Reference:1.Comby et al., Opt. Express 27, 20383 (2019). 2.Frassetto et al., Opt. Express 19, 19169 (2011).

Keywords: XUV Beamline; Photoelectron–Photoion Coincidence Spectroscopy; XUV monochromator; Advanced spectroscopy techniques