Calculation of effective pump dose in X-ray-pump/X-ray-probe experiments.

Authors

Sebastião Antunes, Michal Stransky, Victor Tkachenko, Ichiro Inoue, Philip Heimann, Konrad J Kapcia, Beata Ziaja

Published in

Journal of synchrotron radiation. Sep 01, 2025. Epub Sep 01, 2025.

Abstract

In pump-probe experiments on solid materials performed within ultrafast X-ray science, the energy deposited by an X-ray pump pulse in the sample has a non-uniform spatial distribution. The following X-ray probe pulse then measures a volume-integrated average of contributions from the differently irradiated regions of the sample. Here we propose a scheme to calculate an effective fluence of the pump pulse such that the observable of interest calculated with the effective fluence is very close to the volume-integrated observable. This approach simplifies computational simulations of X-ray irradiated solids, which typically use periodic boundary conditions and assume a uniformly irradiated simulation box. Obtaining a prediction on a volume-integrated observable requires a significant computational effort, as it is necessary to run multiple simulations for the different exposure conditions and then perform their volume integration. The proposed scheme reduces this effort to a single calculation with the effective fluence.

PMID:
40839210
Bibliographic data and abstract were imported from PubMed on 21 Aug 2025.

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