Erlangen 2022 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Femtosecond Spectroscopy III

MO 13.4: Talk

Wednesday, March 16, 2022, 15:15–15:30, MO-H5

Coherent two-dimensional photoelectron spectroscopy — •Daniel Uhl, Ulrich Bangert, Lukas Bruder, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Germany.

Coherent multidimensional spectroscopy (CMDS) is a powerful ultrafast spectroscopic technique which provides spectro-temporal information otherwise only accessible in disjunct experiments. Photoelectron spectroscopy, on the other hand, provides detailed information about the chemical composition and electronic states of the sample.

Here we present a combination of both methods in a single experiment [1]. This becomes feasible with the development of an efficient single-counting detection and multichannel software-based lock-in amplification [2]. The approach offers high temporal, spectral and kinetic energy resolution. It enables differential CMDS experiments with unprecedented selectivity and enhances the dynamic range of CMDS by up to two orders of magnitude. The presented concept opens up a new perspective for atomically-resolved CMDS experiments using X-ray photoelectron spectroscopy.

[1] D. Uhl, U. Bangert, L. Bruder, and F. Stienkemeier, Optica 8, 1316-1324 (2021)

[2] D. Uhl, L. Bruder, and F. Stienkemeier, Review of Scientific Instruments 92, 083101 (2021).