Jourdain N, Lecherbourg L, Recoules V, Renaudin P, Dorchies F
Univ. Bordeaux, CNRS, CEA, CELIA (Centre Lasers Intenses et Applications), UMR 5107, F-33400 Talence, France.
CEA, DAM, DIF, F-91297 Arpajon, France.
Phys Rev Lett. 2021 Feb 12;126(6):065001. doi: 10.1103/PhysRevLett.126.065001.
The ultrafast dynamics of the loss of crystalline periodicity is investigated in femtosecond laser heated warm dense copper, by the original use of x-ray absorption near-edge specific structures just above the L3 edge. The characteristic time is observed near 1 ps, for specific energy density ranging from 1 to 5 MJ/kg, using ps-resolution x-ray absorption spectroscopy. The overall experimental data are well reproduced with two-temperature hydrodynamic simulations, supporting a thermal phase transition.
通过首次利用刚好高于L3边缘的X射线吸收近边特定结构，研究了飞秒激光加热的温稠密铜中晶体周期性丧失的超快动力学。使用皮秒分辨率的X射线吸收光谱，在1至5 MJ/kg的特定能量密度下，观察到特征时间接近1皮秒。整体实验数据通过双温流体动力学模拟得到了很好的再现，支持了热相变。
