类Na离子振子强度的相对论效应
Relativistic effects of oscillator strengths for Na-like ions
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摘要: 采用相对论和非相对论原子自洽场方法，计算了类Na离子（原子序数为11~92）的3s-np，3p-ns和3p-nd跃迁过程的激发能和光学振子强度；通过比较相对论与非相对论的结果，研究了M壳层电子的相对论效应随原子序数的变化规律。结果表明：对n=3的跃迁过程，相对论效应主要是影响激发能，对线强度(或跃迁矩阵元)的影响不重要；对于n>3的跃迁过程，相对论效应同时影响线强度和激发能，通常对线强度的影响更大。这些结果对惯性约束聚变和X射线激光研究中需要的不透明度参数计算有重要的参考意义。Abstract: The relativistic and non-relativistic self-consistent-field methods were utilized to calculate the 3s-np, 3p-ns and 3p-nd excitation energies and oscillator strengths for Na-like ions (atomic number was 11~92). The relativistic effects for the M-shell transitions were discussed by comparing the relativistic results with the non-relativistic ones. It is found that the relativistic effects mainly affect the excitation energies for n=3 transitions and the effects on line strengths (or transitions matrix elements)are small. However, the relativistic effects influence both excitation energies and line strengths for n>3 transitions, and in most cases, the influence on line strengths is stronger. The results are important for calculating the opacities in the research on inertial confinement fusio
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Key words:
- na-like ion /
- oscillator strength /
- excitation energy /
- relativistic effects /
- self-consistent field
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