Resonant energies <em>E_di</em> and natural widths Γ_<em>d</em> (in eV)

<b>Table 2.</b> Resonant energies <em>E_di</em> and natural widths Γ_<em>d</em> (in eV). The numbers in brackets are the experimental errors. <strong>Abstract</strong> Photoionization (PI) cross sections of the ground state 1s² 2s² 2p⁶¹ S₀ of Ne-like Ar⁸⁺, Fe¹⁶⁺, Kr²⁶⁺ and Xe⁴⁴⁺ ions are calculated by using the Dirac atomic <em>R</em>-matrix code based on a fully relativistic <em>R</em>-matrix method. To analyze the detailed resonant structure, systematical calculations based on the multiconfiguration Dirac–Fock method are performed for the dominant 2s → <em>n</em>p resonant transitions, and the resonant energies, strengths and total natural widths are presented. The resonant structures and characteristics of the PI cross sections and resonance strengths along the Ne-like sequence are discussed with emphasis on the influence of relativistic effects. For the Ar⁸⁺ ion, good agreement is found between the present results and available theoretical calculations and experimental data.**表2** 共振能量$E_{di}$与自然宽度$Gamma_d$（单位：电子伏特），括号内数值为实验误差。 **摘要** 针对类氖（Ne-like）氩离子$ ext{Ar}^{8+}$、铁离子$ ext{Fe}^{16+}$、氪离子$ ext{Kr}^{26+}$及氙离子$ ext{Xe}^{44+}$的基态$1s^22s^22p^6 ^1S_0$的光电离（Photoionization, PI）截面，本文基于完全相对论R矩阵方法，采用狄拉克原子R矩阵程序开展了计算。为解析精细共振结构，针对主导的$2s o np$共振跃迁，通过多组态狄拉克-福克（multiconfiguration Dirac–Fock）方法完成了系统性计算，并给出了共振能量、跃迁强度与总自然宽度。本文讨论了类氖序列光电离截面与共振强度的共振结构及特性，重点分析了相对论效应的影响。对于$ ext{Ar}^{8+}$离子，本研究结果与已公开的理论计算及实验数据吻合良好。