https://doi.org/10.1051/epjconf/202430907013
Sub-20-fs UV–XUV Beamline for Ultrafast Molecular Pump-Probe Spectroscopy
1 Dipartimento di Física, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
2 Istituto di Fotonica e Nanotecnologie – CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
3 Grupo de Investigación en Aplicaciones del Láser y Fotónica, Departamento de Física Aplicada, Universidad de Salamanca, 37008 Salamanca, Spain
4 Istituto di Fotonica e Nanotecnologie – CNR, via Trasea 7, 35131 Padova, Italy
* Corresponding author: stefano.severino@polimi.it
Published online: 31 October 2024
The experimental investigation of chemically and biologically relevant dynamics induced by visible or ultraviolet (UV) light requires high temporal resolution and spectroscopic techniques capable of resolving the complexity of these processes. Time-resolved photoelectron spectroscopy has proven to be a key tool for the study of these dynamics, but most studies have been conducted with a limited temporal resolution of about 100 fs. Furthermore, typical schemes employ a deep-UV probe, which limits the observations window and leads to spectrally congested traces. In this work, we present a UV pump – extreme-UV probe beamline with sub-20 fs temporal resolution, unambiguously characterized by an in-situ photoelectron cross-correlation measurement. As an example of the capability of the setup, we show a time-resolved investigation of the non-adiabatic dynamics of acetylacetone. The extreme temporal resolution allows us to resolve the passage through the first conical intersection and to identify the coherently excited vibrational modes.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
