Recombination-Enhanced Surface Expansion of Clusters in Intense Soft X-Ray Laser Pulses.
Recombination-Enhanced Surface Expansion of Clusters in Intense Soft X-Ray Laser Pulses.
复制标题
强软 X 射线激光脉冲中团簇的复合增强表面膨胀。
DOI：
10.1103/physrevlett.117.153401
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发表时间：
2016
影响因子：
8.6
通讯作者：
T. Möller
中科院分区：
文献类型：
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作者：
D. Rupp;L. Flückiger;M. Adolph;T. Gorkhover;M. Krikunova;J. P. Müller;M. Müller;T. Oelze;Y. Ovcharenko;B. Röben;M. Sauppe;S. Schorb;D. Wolter;R. Mitzner;M. Wöstmann;S. Roling;M. Harmand;R. Treusch;M. Arbeiter;T. Fennel;C. Bostedt;T. Möller
我们利用离子光谱学研究了超短强x射线自由电子激光脉冲中单个大氙团簇的纳米等离子体形成和爆炸动力学。单次衍射图像的同时测量使得能够进行单簇分析，该单簇分析不需要对簇大小和激光强度分布进行任何平均。所测得的电荷态分辨离子能谱显示出窄的分布，峰位与最终离子电荷态成线性比例。这两个不同的签名归因于高效的复合，最终导致在集群中的中性原子的主导形成。测得的平均离子能量超过预期的值超过一个数量级以上的重组，表明电子-离子复合产生的能量释放构成了以前未被注意到的纳米等离子体加热过程。这一结论得到了半经典分子动力学模拟结果的支持。
We studied the nanoplasma formation and explosion dynamics of single large xenon clusters in ultrashort, intense x-ray free-electron laser pulses via ion spectroscopy. The simultaneous measurement of single-shot diffraction images enabled a single-cluster analysis that is free from any averaging over the cluster size and laser intensity distributions. The measured charge state-resolved ion energy spectra show narrow distributions with peak positions that scale linearly with final ion charge state. These two distinct signatures are attributed to highly efficient recombination that eventually leads to the dominant formation of neutral atoms in the cluster. The measured mean ion energies exceed the value expected without recombination by more than an order of magnitude, indicating that the energy release resulting from electron-ion recombination constitutes a previously unnoticed nanoplasma heating process. This conclusion is supported by results from semiclassical molecular dynamics simulations.