Department of Physics and Astronomy, University of Delaware , Newark, Delaware 19716, USA.
Argonne National Laboratory , Argonne, Illinois 60439, USA.
Struct Dyn. 2014 Mar 4;1(2):024301. doi: 10.1063/1.4867494. eCollection 2014 Mar.
Designing an efficient and simple method for modulating the intensity of x-ray radiation on a picosecond time-scale has the potential to produce ultrafast pulses of hard x-rays. In this work, we generate a tunable transient superlattice, in an otherwise perfect crystal, by photoexciting a metal film on a crystalline substrate. The resulting transient strain has amplitudes approaching 1%, wavevectors greater than [Formula: see text], and lifetimes approaching 1 ns. This method has the potential to generate isolated picosecond x-ray bursts with scattering efficiencies in excess of 10%.
设计一种在皮秒时间尺度上高效且简单的调制 X 射线辐射强度的方法，有望产生硬 X 射线的超快脉冲。在这项工作中，我们通过在晶体衬底上的金属膜上光激发来产生在其他方面完美的晶体中的可调瞬态超晶格。所产生的瞬态应变的幅度接近 1%，波矢大于[公式]，寿命接近 1 ns。这种方法有可能产生具有超过 10%散射效率的孤立皮秒 X 射线爆发。
