Electron scattering on finite-temperature quantum screened potential

Chen, C.; Zhao, G. P.; Chen, Z. B.; Qi, Y. Y.; Liu, L.; Wu, Y.; Wang, J. G.

doi:10.1063/5.0167661

Cited by 2 publications

(1 citation statement)

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“…计算中将选取接近临界屏蔽强度的等离子体参数, 对比 3种离子的光电离截面, 重点讨论相对论效应对势形共振、Cooper极小和虚态效应的影响. 除了光电离过程, 其他涉及连续态电子的原子过程, 如韧致辐射 [31,32] 、电子弹性散射 [33,34] 、电子碰撞电离 [35,36] 等也能够出现Cooper极小或势形共振结构, 因此本工作的结果可以为与这些原子过程相关的后续研究工作提供理论支持. C离子、Al离子和W离子分别存在于惯性约束聚变等离子体 [23] 、激光等离子体 [37] 和磁约束聚变等离子体环境 [38] 中, 本文的计算结果还能为这些领域提供数据支持.…”

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Influence of relativistic effects on photoionization process of hydrogen-like ions in plasma environment

Ge,

Zhao,

et al. 2024

Acta Phys. Sin.

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In this study, the photoionization cross sections of C5+, Al12+, and W73+ ions in a Debye plasma environment were calculated under the dipole approximation. The main emphasis was placed on investigating the influence of relativistic effects on shape resonances, Cooper minima, and virtual state effects. The relativistic effects lead to fine-structure splittings, allowing for the appearance of double shape resonance peaks in the total cross section. As the resonance peak widths and energy positions are influenced by the proximity to the critical screening length, the increasing nuclear charge Z results in significant differences in the magnitudes, widths, and positions of the double shape resonance peaks. The energy position of Cooper minima in the photoelectrons is related to the critical screening length corresponding to the final continuum state. Unlike the deeper minima observed in the total photoionization cross sections for C5+ and Al12+ ions, for the higher nuclear charge of W73+ ions, the significant fine-structure splitting arising from relativistic effects results in substantial differences in the positions of the Cooper minima in the partial cross-sections. As a result, these minima appear shallower when superimposed in the total cross section. The screening length associated with the virtual state effect in W73+ ions, which have a higher nuclear charge, is completely different from that of C5+ and Al12+ ions. Moreover, for the same screening length, there are significant differences in the magnitude of the virtual state enhancement in the low-energy region between C5+ and Al12+ ions.

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