Femtosecond X-ray measurement of ultrafast melting and large acoustic transients

In: Physical Review Letters, Jg. 87 (2001) ; Nr. 22, S. 225701 (4p)
ISSN: 1079-7114, 0031-9007
Zeitschriftenaufsatz / Fach: Physik
Fakultät für Physik » Experimentalphysik
Time-resolved x-ray diffraction with ultrashort (≈300fs), 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.