Direct imaging of ultrafast electron dynamics by X-ray sum frequency generation
Department of Chemistry and Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
Published online: 16 April 2019
We present a nonlinear X-ray technique which provides a spatial electron density image of valence electron excitations. The technique combines a visible pump and an X-ray pulse and yields snapshots of the transition charge densities.
© The Authors, published by EDP Sciences, 2019
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