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Instruments / Technical Area	Publication Details	Published	Actions
I20-Scanning-X-ray spectroscopy (XAS/XES)	High-accuracy measurement, advanced theory and analysis of the evolution of satellite transitions in manganese K α using XR-HERFD Daniel Sier , Jonathan W. Dean , Nicholas T. T. Tran , Tony Kirk , Chanh Q. Tran , J. Frederick W. Mosselmans , Sofia Diaz-Moreno , Christopher T. Chantler Iucrj 11 DOI: 10.1107/S2052252524005165 Diamond Proposal Number(s): [28859, 30113] Open Access Show Abstract ▼ Abstract: Here, the novel technique of extended-range high-energy-resolution fluorescence detection (XR-HERFD) has successfully observed the n = 2 satellite in manganese to a high accuracy. The significance of the satellite signature presented is many hundreds of standard errors and well beyond typical discovery levels of three to six standard errors. This satellite is a sensitive indicator for all manganese-containing materials in condensed matter. The uncertainty in the measurements has been defined, which clearly observes multiple peaks and structure indicative of complex physical quantum-mechanical processes. Theoretical calculations of energy eigenvalues, shake-off probability and Auger rates are also presented, which explain the origin of the satellite from physical n = 2 shake-off processes. The evolution in the intensity of this satellite is measured relative to the full Kα spectrum of manganese to investigate satellite structure, and therefore many-body processes, as a function of incident energy. Results demonstrate that the many-body reduction factor S02 should not be modelled with a constant value as is currently done. This work makes a significant contribution to the challenge of understanding many-body processes and interpreting HERFD or resonant inelastic X-ray scattering spectra in a quantitative manner.	Jul 2024

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I20-Scanning-X-ray spectroscopy (XAS/XES)

High-accuracy measurement, advanced theory and analysis of the evolution of satellite transitions in manganese K α using XR-HERFD

Daniel Sier , Jonathan W. Dean , Nicholas T. T. Tran , Tony Kirk , Chanh Q. Tran , J. Frederick W. Mosselmans , Sofia Diaz-Moreno , Christopher T. Chantler

Iucrj 11

DOI: 10.1107/S2052252524005165

Diamond Proposal Number(s): [28859, 30113]