Single-photon cross sections σ_<em>jk</em> in units of 10⁻¹⁸ cm², from experiment [26, 30] (bold), using the GIPPER codeprotecthyperlink{jpb462020fn1}{$^{6}$} [31] (italic) and a fitting procedure [32]

<b>Table 1.</b> Single-photon cross sections σ_<em>jk</em> in units of 10⁻¹⁸ cm², from experiment [26, 30] (bold), using the GIPPER code\protect\hyperlink{jpb462020fn1}{$^{6}$} [31] (italic) and a fitting procedure [32]. <strong>Abstract</strong> At the free-electron laser FLASH, multiple ionization of neon atoms was quantitatively investigated at photon energies of 93.0 and 90.5 eV. For ion charge states up to 6+, we compare the respective absolute photoionization yields with results from a minimal model and an elaborate description including standard sequential and direct photoionization channels. Both approaches are based on rate equations and take into account a Gaussian spatial intensity distribution of the laser beam. From the comparison we conclude that photoionization up to a charge of 5+ can be described by the minimal model which we interpret as sequential photoionization assisted by electron shake-up processes. For higher charges, the experimental ionization yields systematically exceed the elaborate rate-based prediction.

表1。 以10⁻¹⁸ cm²为单位的单光子截面σ_<em>jk</em>，数据源自实验[26, 30]（以粗体标注）、参考文献[31]中的GIPPER程序（脚注标记⁶，链接至jpb462020fn1，以斜体标注）以及参考文献[32]中的拟合方法得到的结果。

摘要：本研究在自由电子激光FLASH装置上开展氖原子的多重电离定量研究，实验光子能量分别为93.0 eV与90.5 eV。针对电荷态最高为+6的氖离子，我们将各电荷态下的绝对光电离产额，分别与极简模型以及包含标准顺序电离与直接光电离通道的精细物理模型的计算结果进行对比。两种建模方法均基于速率方程（rate equations），并考虑了激光束的高斯空间强度分布。通过对比分析我们得出结论：电荷态不高于+5的光电离过程可通过极简模型描述，我们将其诠释为受电子抖激（shake-up）过程辅助的顺序光电离过程；而对于更高电荷态的情况，实验测得的电离产额系统性高于基于速率方程的精细物理模型的预测结果。

搜集汇总

背景与挑战

背景概述

该数据集提供了单光子截面σ_jk的数据，单位是10^{-18} cm²，来源于FLASH自由电子激光器上对氖原子多电离过程的实验研究，涉及光子能量93.0和90.5 eV，比较了不同电荷态（最高6+）的光电离产率，并基于速率方程模型进行分析。数据集属于原子和分子物理领域，发布于2013年，采用CC BY 4.0许可证，关键词包括光电离、速率方程和氖原子等。