论文标题
光诱导的动力学的衍射成像在洋掺杂的氦纳米圆形中
Diffraction imaging of light induced dynamics in xenon-doped helium nanodroplets
论文作者
论文摘要
我们已经探索了在泵探针测量方案中具有广角散射的超流体纳米圆形的光诱导动力学。将液滴掺入氙原原子，以通过近红外激光脉冲照射来促进纳米肿瘤的点火。在多达800 ps的时间延迟变化后，我们使用Fermi自由电子激光器的强烈极端紫外线脉冲图像随后的动力学成像。记录的散射图像表现出根据其特征特征对其进行分类的复杂强度波动。进行广角衍射模式的系统模拟，可以通过使用随机分布和结构化的对称扭曲来定性地解释观察到的特征。这表明了液滴中掺杂剂的动力学和位置之间的连接。特别是，正如在先前的小角度衍射实验中观察到的那样，结构化波动可能受到超氟液滴中的量化涡流阵列的控制。我们的结果为进一步研究掺杂剂的相互作用和相关的加热机制提供了基础。
We have explored the light induced dynamics in superfluid helium nanodroplets with wide-angle scattering in a pump-probe measurement scheme. The droplets are doped with xenon atoms to facilitate the ignition of a nanoplasma through irradiation with near-infrared laser pulses. After a variable time delay of up to 800 ps, we image the subsequent dynamics using intense extreme ultraviolet pulses from the FERMI free-electron laser. The recorded scattering images exhibit complex intensity fluctuations that are categorized based on their characteristic features. Systematic simulations of wide-angle diffraction patterns are performed, which can qualitatively explain the observed features by employing model shapes with both randomly distributed as well as structured, symmetric distortions. This points to a connection between the dynamics and the positions of the dopants in the droplets. In particular, the structured fluctuations might be governed by an underlying array of quantized vortices in the superfluid droplet as has been observed in previous small-angle diffraction experiments. Our results provide a basis for further investigations of dopant-droplet interactions and associated heating mechanisms.
