Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra
Abstract
The pulse intensity from X-ray free-electron lasers (FELs) can create extreme excitation densities in solids, entering the regime of non-linear X-ray-matter interactions. We show L3-edge absorption spectra of metallic nickel thin films with fluences entering a regime where several X-ray photons are incident per absorption cross-section. Main features of the observed non-linear spectral changes are described with a predictive rate model for electron population dynamics during the pulse, utilizing a fixed density of states and tabulated ground-state properties.
Keywords
Cite
@article{arxiv.2211.17008,
title = {Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra},
author = {Robin Y. Engel and Oliver Alexander and Kaan Atak and Uwe Bovensiepen and Jens Buck and Robert Carley and Michele Cascella and Valentin Chardonnet and Gheorghe Sorin Chiuzbaian and Christian David and Florian Döring and Andrea Eschenlohr and Natalia Gerasimova and Frank de Groot and Loïc Le Guyader and Oliver S. Humphries and Manuel Izquierdo and Emmanuelle Jal and Adam Kubec and Tim Laarmann and Charles-Henri Lambert and Jan Lüning and Jonathan P. Marangos and Laurent Mercadier and Giuseppe Mercurio and Piter S. Miedema and Katharina Ollefs and Bastian Pfau and Benedikt Rösner and Kai Rossnagel and Nico Rothenbach and Andreas Scherz and Justine Schlappa and Markus Scholz and Jan O. Schunck and Kiana Setoodehnia and Christian Stamm and Simone Techert and Sam M. Vinko and Heiko Wende and Alexander A. Yaroslavtsev and Zhong Yin and Martin Beye},
journal= {arXiv preprint arXiv:2211.17008},
year = {2023}
}
Comments
The main text contains 5 pages and 4 figures, the total length including supplement is 14 pages, 7 figures and one table. See also the simultaneously submitted paper about the rate model