论文标题
通过X射线重量电离的重量稀有气体核心点火氦纳米质量
Ignition of a helium nanoplasma by x-ray multiple ionization of a heavy rare-gas core
论文作者
论文摘要
使用掺杂氦（HE）纳米光谱探测X射线离子化的两个组分核壳纳米系统的动力学。首先，软X射线泵脉冲选择性地内壳会使由较重的稀有气体原子形成的核心簇离子，从而导致电子从HE壳向高电荷芯迁移。这点燃了一种纳米肿瘤，然后由强烈的近红外探针脉冲驱动。超快电荷重新分布，这是由He $^+$的上升证明的，而He $^{2+} $ ion的产量在$ <70 $ fs的范围内从纳米质量中产生，从而导致核心群集扩张的强烈阻尼。因此，他的液滴充当有效的污染物，可减少嵌入式纳米结构的辐射损伤，该特性可以利用用于改善相干衍射图像。
The dynamics of an x-ray-ionized two-component core-shell nanosystem is probed using doped helium (He) nanodroplets. First, a soft x-ray pump pulse selectively inner-shell ionizes the core cluster formed of heavier rare-gas atoms, causing electron migration from the He shell to the highly charged core. This ignites a He nanoplasma which is then driven by an intense near-infrared probe pulse. The ultrafast charge redistribution, evidenced by the rise of He$^+$ and He$^{2+}$ ion yields from the nanoplasma within $<70$ fs, leads to strong damping of the core cluster expansion. Thus, He droplets act as efficient tampers that reduce the radiation damage of embedded nanostructures, a property that could be exploited for improving coherent diffraction images.
