期刊
SOLID STATE COMMUNICATIONS
卷 136, 期 9-10, 页码 559-563出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2005.07.034
关键词
thin films; electron diffraction; phase transitions
We report direct measurement of laser-induced ultrafast structural dynamics on the atomic time and length scales in a 20-nm Al film by taking real-time snapshots of transmission electron diffraction patterns. The damped single-mode breathing motion of the All film along the surface normal was recorded as coherent and in-phase oscillations of all the Bragg peak positions, which had a period of 6.4 ps. The concurrent lattice heating with a time constant of 630 fs was measured by tracking the associated Bragg peak intensity attenuation. These results suggest a direct approach to identify the mechanisms of laser-induced ultrafast solid-liquid phase transition, as well as thermal or non-thermal melting, via probing the temporal evolution of their diffraction patterns. (c) 2005 Elsevier Ltd. All fights reserved.
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