ArticleScientific reports2025
Discovering hidden satellites in Mn Kα using novel high-accuracy fluorescence, with PCA revealing evolution of quantum processes.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We report the first experimental discovery of Hidden Satellites within the K[Formula: see text] emission lines of manganese metal (Mn, [Formula: see text]) with a total integrated statistical significance exceeding 270 [Formula: see text](standard error), far beyond the discovery threshold. Experimental data were collected at the I20-Scanning beamline at the Diamond Light Source using our new eXtended-Range High-Energy-Resolution Fluorescence Detection (XR-HERFD) technique. The Hidden Satellites, embedded in the core emission structure, represent novel quantum many-body processes that evolve systematically as the incident photon energy increases. Principal Component Analysis (PCA) was applied to extract the major separable physical processes and validate the significance of the observed Hidden Satellites. The application of physical insight to the PCA method allowed us to isolate the satellites, and measure the evolutionary profile. Our paper reveals that the total intensity of shake-off satellites can reach as high as 20-25%. Although these are hidden, they are very significant. These results directly challenge the traditional treatment of the many-body reduction factor, [Formula: see text], as a constant in the standard XAFS equation. Our findings demonstrate that this term must be modelled as an energy-dependent function, reflecting its variation with incident photon energy and highlighting its role in many-body interactions. This deeper understanding of fundamental atomic processes directly impacts relativistic quantum mechanics, in theory and application. Also, this develops the two most popular experimental techniques at synchrotrons: X-ray absorption and X-ray emission spectroscopy, responsible for some 12,000 papers per annum, and all applications of these techniques in chemistry, physics, and biology. It offers insights into the evolution of satellites and underscores the broader implications of hidden features in X-ray spectra.
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