Strongly coupled plasma effect on excitation energies of O-like ions and photoionization of F-like ions

Sharma, Rinku; Goyal, Arun

doi:10.1007/s12648-021-02106-0

Cited by 4 publications

(2 citation statements)

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“…对于温度低于电子费米温度以及电子德布罗意波长接近或大于平均粒子间距的低温稠密等离子体, 研究者们分别采用cos-Debye势 [12,13] 、离子球模型势 [14][15][16][17][18] 和解析的b-potential [19,20] 研究了这种库仑耦合参数Γ > 1的强耦合等离子体环境中…”

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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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“…类H离子 [13][14][15]20] 、类Li离子 [14] 、类O离子 [16] 以及Si 10+ -Si 13+ 离子 [18] 的光电离过程. 由于cos-Debye 势的形式包含振荡结构, 研究发现这种屏蔽势中能够存在s波的势形共振 [13,21] .…”

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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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Photoionization of ground and excited states of Cr VIII with Rydberg series analysis of resonances involved

Yadav,

Goyal,

Singh

et al. 2023

Indian J Phys

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Evaluation of the cross sections and photoelectron angular distribution parameters following atomic photoionization under extreme conditions

Chen

2024

Physics of Plasmas

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In this manuscript, we report on a theoretical study of the atomic structures, cross sections, and photoelectron angular distribution parameters following the atomic photoionization under extreme conditions. To achieve this goal, a relativistic approach using the Dirac-Coulomb Hamiltonian within the framework of relativistic configuration interaction, taking advantage of independent particle basis wave functions, is proposed. To describe the interaction of charged particles in the ideal and non-ideal plasmas, the Debye potential and the pseudopotential are implemented, the latter being derived from a progressive resolution of the Bogolyubov chain equations. Both bound and continuous state wave functions, essential for a comprehensive understanding of quantum systems, are determined from the modified local central potential, which is obtained in a self-consistent manner to represent the electronic shielding effect on the nuclear potential. The photoionization processes are evaluated using the relativistic distorted wave approach, which is consistent with the principles of relativistic Dirac theory and thus provides an accurate description of the dynamics. As a test desk, the present method is applied to the evaluation of the energies, ionization potentials, wave functions, cross sections, and photoelectron angular distribution parameters, using the single photon ionization of the Li-like Fe XXIV ions as the basis for analysis. Our results demonstrate that the plasma environment effect not only decreases the ionization potentials and increases the cross sections but also affects the photoelectron angular distribution parameters across different shells, leading to a more balanced and symmetrical photoelectron distribution pattern. A detailed comparison is made between our results, and the available well-established theoretical predictions and experimental data of the unshielded case in the literature shows a good agreement. The present work provides novel insights and theoretical models that not only help us to better understand the fundamental properties of the complex systems but are also beneficial for innovative applications in the study of astrophysical and laboratory plasmas.

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Strongly coupled plasma effect on excitation energies of O-like ions and photoionization of F-like ions

Cited by 4 publications

References 91 publications

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

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

Photoionization of ground and excited states of Cr VIII with Rydberg series analysis of resonances involved

Evaluation of the cross sections and photoelectron angular distribution parameters following atomic photoionization under extreme conditions

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