光子学报, 2016, 45 (12): 1202001, 网络出版: 2016-12-26
Na原子及类Na离子Fe15+价壳层光电离过程的理论研究
Theoretical Study on the Valence-shell Photoionization of Na Atoms and Na-like Fe15+ Ions
原子光学 光电离 截面 Cooper极小 相对论效应 弛豫效应 Atom optics Photoionization Cross section Cooper-minimum Relativistic effect Relaxation effect
摘要
采用相对论多组态Dirac-Fock理论, 计算了Na原子及类Na离子Fe15+基态的光电离截面.对Na原子, 考虑相对论效应与弛豫效应, 本文计算结果与前人计算结果和实验测量结果一致性较好.对Fe15+离子的最外价电子, 相对论效应对其光电离过程产生主要影响, 而轨道弛豫效应则可忽略不计; 对中性Na原子则情况完全不同: 轨道弛豫效应的影响非常显著, 但其光电离截面对相对论效应仅有非常微弱的依赖.
Abstract
Calculations of photoionization cross sections for Na atoms and Na-like Fe15+ ions were carried out in the framework of relativistic multiconfiguration Dirac-Fock method. For Na atoms, comparisons were made with previous theoretical calculations and available experimental measurements and a good or at least reasonable agreement is found if the relativistic and relaxation effects are taken into account. It is shown that, for the outermost valence electrons of medium Fe15+ ions, the relativistic effects accounts for a prominent part in the photoionization process and orbital relaxation can be negligible; however it is not the same case for neutral Na atoms where the influence of orbital relaxations is significant but cross sections slightly depend on the relativistic effects.
刘晓斌, 师应龙, 邢永忠, 路飞平, 陈展斌. Na原子及类Na离子Fe15+价壳层光电离过程的理论研究[J]. 光子学报, 2016, 45(12): 1202001. LIU Xiao-bin, SHI Ying-long, XING Yong-zhong, LU Fei-ping, CHEN Zhan-bin. Theoretical Study on the Valence-shell Photoionization of Na Atoms and Na-like Fe15+ Ions[J]. ACTA PHOTONICA SINICA, 2016, 45(12): 1202001.