Ionization dynamics in expanding clusters studied by XUV pump–probe spectroscopy

Ionization dynamics in expanding clusters studied by XUV pump–probe spectroscopy
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XUV泵浦探针光谱研究膨胀团簇的电离动力学

DOI:
10.1088/0953-4075/45/10/105101
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发表时间:
2012
期刊:
Journal of Physics B: Atomic, Molecular and Optical Physics
影响因子:
--
通讯作者:
M. Krikunova
M. Krikunova
中科院分区:
--
文献类型:
--
作者:
M. Krikunova

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利用汉堡自由电子激光器(FLASH)的自相关装置,利用泵浦-探测光谱技术研究了飞秒软X射线极紫外(XUV)脉冲电离引发的氙团簇的膨胀和衰变动力学。第一个92 eV光子能量(8× 10 12 W cm− 2)的XUV脉冲电离导致大量准自由电子的产生,这些电子被团簇离子的空间电荷捕获。一个时间上延迟的、更强的探测脉冲(4× 10 13 W cm− 2)大大增加了纳米等离子体电子的数量,通过追踪碎片离子的平均电荷,提供了一种探测膨胀团簇中等离子体状态的方法。研究结果揭示了集群扩展和解体的时间尺度,这基本上取决于初始集群的大小。碎片离子的平均电荷状态,因此团簇等离子体在1-3 ps的时间尺度上显著变化。
The expansion and disintegration dynamics of xenon clusters initiated by the ionization with femtosecond soft x-ray extreme ultraviolet (XUV) pulses were studied with pump–probe spectroscopy using the autocorrelator setup of the Free-Electron LASer in Hamburg (FLASH) facility. The ionization by the first XUV pulse of 92 eV photon energy (8× 10 12 W cm− 2) leads to the generation of a large number of quasi-free electrons trapped by the space charge of the cluster ions. A temporally delayed, more intense probe (4× 10 13 W cm− 2) pulse substantially increases a population of nanoplasma electrons providing a way of probing plasma states in the expanding cluster by tracing the average charge of fragment ions. The results of the study reveal a timescale for cluster expansion and disintegration, which depends essentially on the initial cluster size. The average charge state of fragment ions, and thus the cluster plasma changes significantly on a timescale of 1–3 ps.
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