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arXiv 2201.03840physics.atom-ph
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类氦离子光场强度诊断的静场电离模型

Static-field ionization model of He-like ions for diagnostics of light field intensity

Erik Lötstedt, Marcelo. F. Ciappina, Kaoru Yamanouchi

摘要:

研究了核电荷数在$2\le Z \le 36$范围内的类氦离子的静场电离。隧穿和过势垒制度被认为是。我们用三种近似方法计算了电离率:基于Perelemov-Popov-Terent'ev(PPT)公式的拟合公式、$1/Z$幂的微扰展开和单激活电子近似,并与多组态含时Hartree-Fock(MCTDHF)方法计算的参考电离率进行了比较.由PPT拟合公式和三阶微扰理论计算的速率与由MCTDHF方法计算的速率的相对偏差约为10%.我们定量讨论了交换相互作用的贡献,在电离过程中,通过比较单活性电子速率和参考率,其中包括多电子效应。我们发现,一个单一的活性电子近似,其中交换相互作用被忽略,结果在高估的电离率为30%的He和2%的类He的氪,表明交换相互作用的影响的规模约为$1/Z$。

英文摘要:

We study static-field ionization of He-like ions with nuclear charge number in the range of $2\le Z \le 36$. Both the tunneling and over-the-barrier regimes are considered. We calculate the ionization rates by three approximate methods: a fitting formula based on the Perelemov-Popov-Terent'ev (PPT) formula, a perturbative expansion in powers of $1/Z$, and a single-active electron approximation, and compare them with reference ionization rates computed by the multiconfiguration time-dependent Hartree-Fock (MCTDHF) approach. The relative deviation of the rates computed by the PPT-based fitting formula and the third-order perturbation theory from the rates computed by the MCTDHF approach is found to be around 10\%. We discuss quantitatively the contribution from the exchange interaction during the ionization by comparing the single-active electron rates and the reference rates in which multielectron effects are included. We find that a single-active electron approximation, where the exchange interaction is neglected, results in the overestimation of the ionization rates by 30\% for He and 2\% for He-like Kr, showing that the magnitude of the effect of the exchange interaction scales approximately as $1/Z$.

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