Non-adiabatic cluster expansion after ultrashort laser interaction
Non-adiabatic cluster expansion after ultrashort laser interaction
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DOI：
10.1017/s0263034608000104
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发表时间：
2008-03-01
影响因子：
0.9
通讯作者：
Gasilov, V. A.
中科院分区：
文献类型：
--
作者：
Faenov, A. Ya.;Magunov, A. I.;Gasilov, V. A.
我们使用X射线光谱作为诊断工具，调查在非绝热集群膨胀发生和准均匀等离子体产生的阶段的激光集群相互作用的属性。实验是用10 TW，65 fs的Ti：Sa激光聚焦于CO2团簇射流进行的。研究了不同的激光脉冲对比度和团簇浓度对探测结果的影响。与里德伯跃迁相关的X射线发射使我们能够通过发射等离子体的密度和温度来检索发射发生时相互作用开始后的时间。该值与“均匀”等离子体形成的估计时间的比较表明，绝热性的程度取决于簇浓度和脉冲对比度。干涉测量支持有关等离子体电子密度的X射线数据。
We used X-ray spectroscopy as a diagnostic tool for investigating the properties of laser-cluster interactions at the stage in which non-adiabatic cluster expansion takes place and a quasi-homogeneous plasma is produced. The experiment was carried out with a 10 TW, 65 fs Ti:Sa laser focused on CO2 cluster jets. The effect of different laser-pulse contrast ratios and cluster concentrations was investigated. The X-ray emission associated to the Rydberg transitions allowed us to retrieve, through the density and temperature of the emitting plasma, the time after the beginning of the interaction at which the emission occurred. The comparison of this value with the estimated time for the "homogeneous" plasma formation shows that the degree of adiabaticity depends on both the cluster concentration and the pulse contrast. Interferometric measurements support the X-ray data concerning the plasma electron density.