%0 Journal Article
%A Antunes, Sebastião
%A Stransky, Michal
%A Tkachenko, Victor
%A Inoue, Ichiro
%A Heimann, Philip
%A Kapcia, Konrad J.
%A Ziaja, Beata
%T Calculation of effective pump fluence in X-ray pump - X-ray probeexperiments
%J Journal of synchrotron radiation
%V 32
%N 5
%@ 0909-0495
%C Chester
%I IUCr
%M PUBDB-2025-00082
%P 1106 - 1115
%D 2025
%X n 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. 
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1107/S1600577525006939
%U https://bib-pubdb1.desy.de/record/620209