The study of structural dynamics of complex macromolecular crystals using electrons
requires bunches of sufficient coherence and charge. We present diffraction patterns from
graphite,
obtained with bunches from an ultracold electron source, based on femtosecond near-threshold
photoionization
of a laser-cooled atomic gas. By varying the photoionization wavelength, we change the effective
source
temperature from 300 K to 10 K, resulting in a concomitant change in the width of the
diffraction
peaks, which is consistent with independently measured source parameters. This
constitutes a direct measurement of the beam coherence of this ultracold source and confirms its
suitability for protein crystal diffraction
Is data on this page outdated, violates copyrights or anything else? Report the problem now and we will take corresponding actions after reviewing your request.