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We demonstrated dynamical observation of an individual nanocrystal in supercooled liquid water with the guidance of x-ray diffracted spots from the nanocrystal itself. This new system, which we call diffracted x-ray tracking, monitored small Brownian motions (D=0.68 mrad(2)/s at 233 K) of a single nanoparticle in real time and real space.
Sasaki et al. (Fri,) studied this question.