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arXiv 0811.1361physics.atom-ph
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脉冲宽度对强laser场中Ar团簇X射线发射的影响

Effect of pulse duration on the x-ray emission from Ar clusters in intense laser fields

Christophe Prigent, Emily Lamour, Jean-Pierre Rozet, Dominique Vernhet, Cornelia Deiss, Joachim Burgdörfer

摘要:

从理论和实验上研究了强红外激光脉冲与N~(10)^4 - 10)^6原子/氩团簇相互作用过程中特征Ka x射线的产生。重点研究了激光强度和脉冲宽度对发射团簇氩离子的总X射线产额和电荷态分布的影响。提出了一种基于设置几何结构的X射线产额的实验优化方法,并研究了有效聚焦体积的作用。我们的理论模型是基于平均场蒙特卡罗模拟,并允许确定有效加热的子系综的电子在强场的起源所观察到的X射线发射。良好控制的实验条件允许的绝对X射线产量以及具有K-壳层空位的离子的电荷态分布的定量基准。发现在恒定激光能量下使X射线产率最大化的最佳脉冲持续时间的存在是单个簇动力学和参与发射的簇的数量之间竞争的结果。

英文摘要:

We study experimentally and theoretically the production of characteristic Ka x-rays during the interaction of intense infrared laser pulse with large N~10^4-10^6 atoms/ argon clusters. We focus on the influence of laser intensity and pulse length on both the total x-ray yields and the charge-state distributions of the emitting cluster argon ions. An experimental optimization of the x-ray yield based on the setup geometry is presented and the role of the effective focal volume is investigated. Our theoretical model is based on a mean-field Monte-Carlo simulation and allows identifying the effective heating of a subensemble of electrons in strong fields as the origin of the observed x-ray emission. Well-controlled experimental conditions allow a quantitative bench marking of absolute x-ray yields as well as charge state distributions of ions having a K-shell vacancy. The presence of an optimum pulse duration that maximizes the x-ray yield at constant laser energy is found to be the result of the competition between the single cluster dynamics and the number of clusters participating in the emission.

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