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Spectroscopic analysis demonstrates extreme x-ray fluorescence broadening in sodium sulfate, indicating a universal quasiparticle lifetime effect across compounds.
Extreme broadening previously observed in certain N x-ray fluorescence lines excited near the N K edge in nitrates has been observed in the S L x-ray fluorescence in sodium sulfate, Na₂SO₄. It is explained as a large imaginary self-energy corresponding to an anomalously short lifetime of quasiparticles in one of the valence bands of these compounds. Our latest measurement and the corresponding many-body theory indicate that this is a general effect not specific to nitrates.
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Jach et al. (2025) studied this question.
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