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Detailed electron impact fine-structure excitation cross-sections of Kr+ and linear polarization of its subsequently emitted photons
Journal of Quantitative Spectroscopy and Radiative Transfer ( IF 2.3 ) Pub Date : 2020-05-26 , DOI: 10.1016/j.jqsrt.2020.106992
Shivam Gupta , Rajesh Srivastava

An extensive calculation for electron impact excitation cross-sections of Kr+ ion is performed using relativistic distorted wave theory. The transitions considered are from the ground state i.e. 4s24p5 (J=3/2) to the 4s24p5 (J = 1/2), 4s4p6 (J=1/2) levels and fine structure levels of 4s24p45s, 4s24p45p, 4s24p46s, 4s24p46p, 4s24p44d and 4s24p45d excited states. The transition matrix is evaluated using the relativistic multi-configuration Dirac-Fock bound state wave functions of the initial and final states of Kr+ ion obtained from the GRASP2K program. The 4s24p5, 4s4p6, 4s24p45s, 4s24p45p, 4s24p46s, 4s24p46p, 4s24p44d and 4s24p45d configuration state functions are used to calculate the required wave functions. The incident and scattered projectile electron continuum wave functions are calculated numerically by solving the Dirac equations using static potential of the target ion. Oscillator strengths and transition probabilities are calculated and reported for the dipole allowed transitions, making these available to check the accuracy of the bound state wave functions for future comparison purposes. The detailed excitation cross-sections and their corresponding excitation rate coefficients are reported for considered 116 fine-structure excitation transitions from the ground state 4s24p5 (J=3/2). Further, analytic fittings of the obtained cross-sections with respect to incident electron energy are also performed for all the transitions considered in the present work so that these can be directly used in any plasma model for diagnostics purposes. In addition, using the obtained magnetic sub-level cross-sections, the degree of linear polarization of the photon emissions from the decay of electron impact excited anisotropic states of Kr+ ion through the dipole allowed transitions is calculated and reported.



中文翻译:

Kr +的详细电子碰撞精细结构激发截面及其随后发射的光子的线性极化

使用相对论畸变波理论对Kr +离子的电子冲击激发截面进行了广泛的计算。考虑的过渡是从即4S基态2 4P 5(J = 3/2)到4S 2 4P 5(J = 1/2),4s4p 6(j = 1/2)的水平和精细结构水平4S的2 4p 4 5s,4s 2 4p 4 5p,4s 2 4p 4 6s,4s 2 4p 4 6p,4s 2 4p 4 4d和4s 2 4p 45d激发态。使用从GRASP2K程序获得的Kr +离子的初始状态和最终状态的相对论多配置Dirac-Fock束缚状态波函数来评估过渡矩阵。该4S 2 4P 5,4s4p 6,4S 2个4P 4 5S,4S 2 4P 4 5P,4S 2个4P 4 6S,4S 2 4P 4 6P,4S 2 4P 4 4d和4S 2 4P 45d配置状态函数用于计算所需的波动函数。通过使用目标离子的静态势求解Dirac方程,可以数值计算入射和散射的射弹电子连续波函数。计算并报告了偶极允许的跃迁的振荡器强度和跃迁概率,使其可用于检查束缚态波函数的准确性,以备将来比较之用。报告了从基态4s 2 4p 5考虑的116个精细结构的激发跃迁的详细激发截面及其对应的激发速率系数。(J = 3/2)。此外,还针对当前工作中考虑的所有跃迁,对入射电子能量进行了横截面的解析拟合,以便可以将这些跃迁直接用于任何等离子体模型以进行诊断。另外,使用获得的磁子能级横截面,计算并报告了由于偶极子允许跃迁引起的Kr +离子的电子撞击激发各向异性态的衰减而引起的光子发射的线性极化程度。

更新日期:2020-05-26
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