Laser-induced short-range disorder in aluminum revealed by ultrafast electron diffuse scattering
Laser-induced short-range disorder in aluminum revealed by ultrafast electron diffuse scattering
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DOI：
10.1063/1.4840355
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发表时间：
2013-12
影响因子：
4
通讯作者：
P. Zhu;Jie Chen;Runze Li;Long Chen;Jianming Cao;Z. Sheng;Jie Zhang
中科院分区：
文献类型：
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作者：
P. Zhu;Jie Chen;Runze Li;Long Chen;Jianming Cao;Z. Sheng;Jie Zhang
为了研究铝对飞秒激光激发的结构响应，我们报道了超快电子扩散散射强度(DSI)测量。在该测量中，测量了激光激发后DSI和Bragg峰强度的演化，并在时间域上进行了比较。它们的差异表明，短程和长程两种晶格无序是同时触发的。前者由电子激发引起，其产生和衰变的速度比后者快，后者受晶格加热的影响。结果表明，时间分辨DSI测量为超快衍射测量提供了补充。
We report ultrafast electron diffuse scattering intensity (DSI) measurement in order to study the structural response of aluminum to femtosecond laser excitation. In this measurement, the evolutions of DSI and Bragg peak intensities after the laser excitation are measured and compared in the time domain. Their differences suggest that two kinds of lattice disorder, short-range and long-range, are triggered simultaneously. The former, induced by electron excitation, arises and decays with a faster rate than the latter which is subject to lattice heating. The results presented show that the time-resolved DSI measurements provide complementary insights to the ultrafast diffraction measurements.