Snapshot of the Laplacian of the projected instantaneous electron density of a wave packet proposed to be imaged by scattering of ultrashort x-ray pulses.

From the article:

Proposed Imaging of the Ultrafast Electronic Motion in Samples using X-Ray Phase Contrast
Gopal Dixit, Jan Malte Slowik, and Robin Santra
Phys. Rev. Lett. 110, 137403 (2013)

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