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Current vs Charge Density Contributions to Nonlinear X-ray Spectroscopy
Jérémy R Rouxel1, Markus Kowalewski1, Shaul Mukamel1
1Department of Chemistry, University of California , Irvine, California 92697-2025, United States.
Abstract:
Stimulated (coherent) and spontaneous (incoherent) nonlinear X-ray signals are expressed using a spatially nonlocal response tensor which directly connects them to the time evolving current j and charge σ densities rather than to electric and magnetic multipoles. The relative contributions of the σA(2) and j · A minimal coupling terms, where A is the vector potential, are demonstrated. The two dominate off-resonant and resonant scattering, respectively, and make comparable contributions at near resonant detunings.
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