Second-order microscopic nonlinear susceptibility in a centrosymmetric material: application to imaging valence electron motion

Chance Ornelas-Skarin, Tatiana Bezriadina, Matthias Fuchs +10

We report measurements of phase-matched nonlinear x-ray and optical sum-frequency generation from single-crystal silicon using sub-resonant 0.95 eV laser pulses and 9.5 keV hard x-…