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arXiv 1206.1875physics.atom-phphysics.comp-phphysics.optics
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X射线自由电子激光脉冲中氙原子离子、电子和光子谱的蒙特卡罗计算

Monte Carlo calculation of ion, electron, and photon spectra of xenon atoms in x-ray free-electron laser pulses

Sang-Kil Son, Robin Santra

摘要:

当原子和分子被X射线自由电子激光(XFEL)照射时,它们通过一系列单光子电离和弛豫过程被高度电离。为了描述XFEL脉冲过程中的电离动力学,速率方程模型已被采用。尽管这个模型对于轻原子的情况很简单,但对于氙这样的重原子,它产生了大量的耦合速率方程,直接求解这些方程并不容易。在这里,我们采用Monte Carlo方法来解决这个问题,我们研究的电离动力学的氙原子诱导的XFEL脉冲在光子能量为4500 eV。电荷态分布,光/俄歇电子光谱,和荧光光谱的X射线通量高达$10^{13}$光子/ $μ$ m $^2$。在4500 eV的光子能量下,氙原子可以通过多光子吸收电离到+44,其特征在于顺序的单光子单电子相互作用。

英文摘要:

When atoms and molecules are irradiated by an x-ray free-electron laser (XFEL), they are highly ionized via a sequence of one-photon ionization and relaxation processes. To describe the ionization dynamics during XFEL pulses, a rate equation model has been employed. Even though this model is straightforward for the case of light atoms, it generates a huge number of coupled rate equations for heavy atoms like xenon, which are not trivial to solve directly. Here, we employ the Monte Carlo method to address this problem and we investigate ionization dynamics of xenon atoms induced by XFEL pulses at a photon energy of 4500 eV. Charge state distributions, photo-/Auger electron spectra, and fluorescence spectra are presented for x-ray fluences of up to $10^{13}$ photons/$μ$m$^2$. With the photon energy of 4500 eV, xenon atoms can be ionized up to +44 through multiphoton absorption characterized by sequential one-photon single-electron interactions.

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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