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Phys Rev Lett. 2001 Nov 26;87(22):225701. Epub 2001 Nov 7.

Femtosecond x-ray measurement of ultrafast melting and large acoustic transients.

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Institut für Laser- und Plasmaphysik, Universität Essen, D-45117 Essen, Germany.


Time-resolved x-ray diffraction with ultrashort ( approximately 300 fs), multi-keV x-ray pulses has been used to study the femtosecond laser-induced solid-to-liquid phase transition in a thin crystalline layer of germanium. Nonthermal melting is observed to take place within 300-500 fs. Following ultrafast melting we observe strong acoustic perturbations evolving on a picosecond time scale.

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