Resonant inelastic x-ray scattering in warm-dense Fe compounds beyond the SASE FEL resolution limit

Resonant inelastic x-ray scattering (RIXS) is a widely used spectroscopic technique, providing access to the electronic structure and dynamics of atoms, molecules, and solids. However, RIXS requires a narrow bandwidth x-ray probe to achieve high spectral resolution. The challenges in delivering an e...

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Published inarXiv.org
Main Authors te, Alessandro, Gawne, Thomas, Alaa El-Din, Karim K, Humphries, Oliver S, Preston, Thomas R, Crépisson, Céline, Campbell, Thomas, Svensson, Pontus, Azadi, Sam, Heighway, Patrick, Shi, Yuanfeng, Chin, David A, Smith, Ethan, Baehtz, Carsten, Bouffetier, Victorien, Höppner, Hauke, McGonegle, David, Harmand, Marion, Collins, Gilbert W, Wark, Justin S, Polsin, Danae N, Vinko, Sam M
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 11.01.2024
Subjects
Electronic structure
Free electron lasers
Inelastic scattering
Molecular structure
Spectral resolution
Spontaneous emission
X-ray scattering
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Summary:Resonant inelastic x-ray scattering (RIXS) is a widely used spectroscopic technique, providing access to the electronic structure and dynamics of atoms, molecules, and solids. However, RIXS requires a narrow bandwidth x-ray probe to achieve high spectral resolution. The challenges in delivering an energetic monochromated beam from an x-ray free electron laser (XFEL) thus limit its use in few-shot experiments, including for the study of high energy density systems. Here we demonstrate that by correlating the measurements of the self-amplified spontaneous emission (SASE) spectrum of an XFEL with the RIXS signal, using a dynamic kernel deconvolution with a neural surrogate, we can achieve electronic structure resolutions substantially higher than those normally afforded by the bandwidth of the incoming x-ray beam. We further show how this technique allows us to discriminate between the valence structures of Fe and Fe\(_2\)O\(_3\), and provides access to temperature measurements as well as M-shell binding energies estimates in warm-dense Fe compounds.
ISSN:2331-8422