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arXiv physics/0510187physics.atom-phphysics.comp-ph
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强真空紫外辐射与大氙团簇的相互作用

Interaction of intense vuv radiation with large xenon clusters

Zachary B. Walters, Robin Santra, Chris H. Greene

摘要:

原子团簇与短脉冲强激光相互作用形成极热、致密的等离子体引起了广泛的实验和理论研究兴趣。团簇内原子的高密度极大地增强了原子-激光相互作用,而团簇的有限尺寸防止能量从相互作用区域逃逸。最近的技术进步使实验能够探测在非常高的光子能量下的激光-团簇相互作用,其相互作用比较低光子能量的理论所建议的要强得多。本文提出了一个激光-团簇相互作用的模型,它采用非微扰R矩阵方法计算了Herman-Skillman原子势的逆韧致辐射和光电离截面。我们描述了在逆韧致辐射加热、光电离、碰撞电离和复合以及团簇膨胀等过程的影响下团簇的演化。我们比较电荷态分布,电荷态喷射能量,和总能量吸收与汉堡实验的Wabnitz { \em et al.} [Nature { \bf 420},482(2002)]和Laarmann { \em et al.} [Phys. Rev. Lett. { \bf 95},063402(2005)]。

英文摘要:

The interaction of atomic clusters with short, intense pulses of laser light to form extremely hot, dense plasmas has attracted extensive experimental and theoretical interest. The high density of atoms within the cluster greatly enhances the atom--laser interaction, while the finite size of the cluster prevents energy from escaping the interaction region. Recent technological advances have allowed experiments to probe the laser--cluster interaction at very high photon energies, with interactions much stronger than suggested by theories for lower photon energies. We present a model of the laser--cluster interaction which uses non-perturbative R-matrix techniques to calculate inverse bremsstrahlung and photoionization cross sections for Herman-Skillman atomic potentials. We describe the evolution of the cluster under the influence of the processes of inverse bremsstrahlung heating, photoionization, collisional ionization and recombination, and expansion of the cluster. We compare charge state distribution, charge state ejection energies, and total energy absorbed with the Hamburg experiment of Wabnitz {\em et al.} [Nature {\bf 420}, 482 (2002)] and ejected electron spectra with Laarmann {\em et al.} [Phys. Rev. Lett. {\bf 95}, 063402 (2005)].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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