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Phys Rev Lett. 2008 Apr 4;100(13):135502. Epub 2008 Mar 31.

X-ray diffuse scattering measurements of nucleation dynamics at femtosecond resolution.

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  • 1PULSE Center, Stanford Linear Accelerator Center, Menlo Park, California 94025, USA.

Abstract

Femtosecond time-resolved small and wide angle x-ray diffuse scattering techniques are applied to investigate the ultrafast nucleation processes that occur during the ablation process in semiconducting materials. Following intense optical excitation, a transient liquid state of high compressibility characterized by large-amplitude density fluctuations is observed and the buildup of these fluctuations is measured in real time. Small-angle scattering measurements reveal snapshots of the spontaneous nucleation of nanoscale voids within a metastable liquid and support theoretical predictions of the ablation process.

PMID:
18517965
[PubMed]
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