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Coherent nonlinear X-ray four-photon interaction with core-shell electrons
Nature, Published online: 14 January 2026; doi:10.1038/s41586-025-09911-1Using single broadband X-ray pulses from a free-electron laser on a gaseous neon target, coherent, nonlinear four-photon interactions with coreshell electrons is demonstrated, representing a strategy for multidimensional correlation spectroscopy at the atomic scale.
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