Comparison of Electron and Ion Emission from Xenon Cluster-Induced Ignition of Helium Nanodroplets.

Comparison of Electron and Ion Emission from Xenon Cluster-Induced Ignition of Helium Nanodroplets.
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氙簇诱导氦纳米液滴点火的电子和离子发射比较

DOI:
10.1021/acs.jpca.8b06673
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发表时间:
2018
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
J. Tiggesbäumker
J. Tiggesbäumker
中科院分区:
--
文献类型:
--
作者:
M. Kelbg;A. Heidenreich;L. Kazak;M. Zabel;B. Krebs;K.-H. Meiwes-Broer;J. Tiggesbäumker

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通过比较氦和高电荷态氦离子的丰度与电子信号,研究了强激光场中嵌入氙团簇点火驱动的氦液滴的充电动力学。飞秒泵浦探测实验表明,附近的高电荷氙的最佳延迟的电子产额增加,特别是在低能量。电子签名可以追溯到氦环境的电离的种子电子。伴随的分子动力学模拟表明,在Xe-He核壳系统的两步电离方案。与氙相反,氦离子的实验信号以及低能电子发射表现出偏离的延迟依赖性,表明Xe核心和He周围的电荷态分布在时间和空间发展上存在差异。从电子发射的泵浦-探测依赖性,可以提取有效温度,指示纳米等离子体衰减。
The charging dynamics of helium droplets driven by embedded xenon cluster ignition in strong laser fields is studied by comparing the abundances of helium and highly charged Xe ions to the electron signal. Femtosecond pump–probe experiments show that near the optimal delay for highly charged xenon the electron yield increases, especially at low energies. The electron signature can be traced back to the ionization of the helium environment by Xe seed electrons. Accompanying molecular dynamics simulations suggest a two-step ionization scenario in the Xe–He core–shell system. In contrast to xenon, the experimental signal of the helium ions, as well as low-energy electron emission show a deviating delay dependence, indicating differences in the temporal and spacial development of the charge state distribution of Xe core and He surrounding. From the pump–probe dependence of the electron emission, effective temperatures can be extracted, indicating the nanoplasma decay.
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