Ignition of a helium nanoplasma by x-ray multiple ionization of a heavy rare-gas core.
Ignition of a helium nanoplasma by x-ray multiple ionization of a heavy rare-gas core.
复制标题
通过重稀有气体核心的 X 射线多重电离点燃氦纳米等离子体。
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
M. Mudrich
中科院分区：
文献类型：
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作者：
D. Schomas;C. Medina;L. Ltaief;R. B. Fink;S. Mandal;S. Krishnan;R. Michiels;M. Debatin;F. Stienkemeier;S. Toleikis;C. Passow;N. Ekanayake;C. Ott;R. Moshammer;T. Pfeifer;A. Heidenreich;M. Mudrich
利用掺杂氦纳米液滴研究了X射线电离的双组分核壳纳米系统的动力学。首先，软X射线泵浦脉冲选择性地内壳电离由较重的稀有气体原子形成的核心簇，导致电子从He壳迁移到高度带电的核心。这点燃了He纳米等离子体，然后由强烈的近红外探测脉冲驱动。超快的电荷重新分布，证明了从纳米等离子体的He$^+$和He$^{2+}$产率的上升，导致核心团簇膨胀的强烈阻尼。因此，He液滴作为有效的篡改，减少嵌入式纳米结构的辐射损伤，可以利用改善相干衍射图像的属性。
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.