Direct observation of dynamics of thermal expansion using pump-probe high-energy-resolution x-ray diffraction

Article

关键词: PULSES;    REFLECTIVITY;    SURFACE;   

DOI  :  10.1103/PhysRevB.86.054301

来源: SCIE

【 摘 要 】

Time evolution of thermal expansion in the crystal lattice of diamond was studied on the time scale from 100 ps to 18 mu s upon heating of the crystal through the entire thickness by a penetrating optical laser pulse of approximate to 8 ps in duration. Bragg reflectivity curves were measured at different instants of time using pump-probe high-energy-resolution x-ray diffraction with similar or equal to 10(-8) strain sensitivity. The observed time-dependent variation of Bragg reflectivity was found to be in agreement with dynamical diffraction calculations for a crystal with propagating strain generated by thermally induced stress. The strain propagated at the speed of sound for longitudinal waves from both crystal surfaces into the bulk.

【 授权许可】

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