论文标题
He样离子的静态场电离模型用于光场强度的诊断
Static-field ionization model of He-like ions for diagnostics of light field intensity
论文作者
论文摘要
我们研究具有核电数量的HE样离子的静态场电离在$ 2 \ le le Z \ le 36 $之间。考虑到隧道和过度级别的制度。 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.发现由基于PPT的拟合公式计算出的速率的相对偏差以及与MCTDHF方法计算的速率相比的扰动理论的相对偏差约为10 \％。我们通过比较单活动电子速率和包括多电子效应的参考率来定量讨论交换相互作用的贡献。我们发现，忽略交换相互作用的单活性电子近似，导致HE的电离速率高估了30 \％，而HE样KR的电离速率为2 \％，表明交换相互作用量表的幅度约为$ 1/z $。
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 $1/Z$.
