Dirac R-matrix calculations of photoionization cross sections of Ni XII and atomic structure data of Ni XIII

doi:10.1088/1674-1056/26/2/023102

摘要/Abstract

摘要： We performed R-matrix calculations for photoionization cross sections of the two ground state configuration 3s²3p⁵ (²P^o_3/2,1/2) levels and 12 excited states of Ni XII using relativistic Dirac Atomic R-matrix Codes (DARC) across the photon energy range between the ionizations thresholds of the corresponding states and well above the thresholds of the last level of the Ni XIII target ion. Generally, a good agreement is obtained between our results and the earlier theoretical photoionization cross sections. Moreover, we have used two independent fully relativistic GRASP and FAC codes to calculate fine-structure energy levels, wavelengths, oscillator strengths, transitions rates among the lowest 48 levels belonging to the configuration (3s²3p⁴, 3s3p⁵, 3p⁶, 3s²3p³3d) in Ni XIII. Additionally, radiative lifetimes of all the excited states of Ni XIII are presented. Our results of the atomic structure of Ni XIII show good agreement with other theoretical and experimental results available in the literature. A good agreement is found between our calculated lifetimes and the experimental ones. Our present results are useful for plasma diagnostic of fusion and astrophysical plasmas.

关键词: photoionization cross sections, energy levels, wavelengths, lifetimes

Abstract: We performed R-matrix calculations for photoionization cross sections of the two ground state configuration 3s²3p⁵ (²P^o_3/2,1/2) levels and 12 excited states of Ni XII using relativistic Dirac Atomic R-matrix Codes (DARC) across the photon energy range between the ionizations thresholds of the corresponding states and well above the thresholds of the last level of the Ni XIII target ion. Generally, a good agreement is obtained between our results and the earlier theoretical photoionization cross sections. Moreover, we have used two independent fully relativistic GRASP and FAC codes to calculate fine-structure energy levels, wavelengths, oscillator strengths, transitions rates among the lowest 48 levels belonging to the configuration (3s²3p⁴, 3s3p⁵, 3p⁶, 3s²3p³3d) in Ni XIII. Additionally, radiative lifetimes of all the excited states of Ni XIII are presented. Our results of the atomic structure of Ni XIII show good agreement with other theoretical and experimental results available in the literature. A good agreement is found between our calculated lifetimes and the experimental ones. Our present results are useful for plasma diagnostic of fusion and astrophysical plasmas.

Key words: photoionization cross sections, energy levels, wavelengths, lifetimes

中图分类号: (Excitation energies and lifetimes; oscillator strengths)

31.15.ag

31.15.aj (Relativistic corrections, spin-orbit effects, fine structure; hyperfine structure) 31.15.am (Relativistic configuration interaction (CI) and many-body perturbation calculations) 32.80.-t (Photoionization and excitation)

R T Nazir, M A Bari, M Bilal, S Sardar, M H Nasim, M Salahuddin. Dirac R-matrix calculations of photoionization cross sections of Ni XII and atomic structure data of Ni XIII[J]. 中国物理B, 2017, 26(2): 23102-023102.

R T Nazir, M A Bari, M Bilal, S Sardar, M H Nasim, M Salahuddin. Dirac R-matrix calculations of photoionization cross sections of Ni XII and atomic structure data of Ni XIII[J]. Chin. Phys. B, 2017, 26(2): 23102-023102.

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