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X-ray Thomson scattering absolute intensity from the f-sum rule in the imaginary-time domain
preprintposted on 2023-06-08, 13:05 authored by Tobias Dornheim, Tilo Döppner, Andrew D. Baczewski, Panagiotis Tolias, Maximilian P. Böhme, Zhandos A. Moldabekov, Divyanshu Ranjan, David A. Chapman, Michael J. MacDonald, Thomas R. Preston, Dominik Kraus, Jan Vorberger
We evaluate the f-sum rule on the dynamic structure factor in the imaginary-time domain as a formally exact and simulation-free means of normalizing X-Ray Thomson Scattering (XRTS) spectra. This circumvents error-prone real-time deconvolution of the source function and facilitates calculating the static structure factor from the properly normalized imaginary-time correlation function. We apply our technique to two distinct sets of experimental data, finding that it is effective for both narrow and broad x-ray sources. This approach could be readily adapted to other scattering spectroscopies.