The researchers report on a new study of the x-ray photoabsorption spectrum of sodium near the K-edge, involving the calculations of the excitation energies and the excitation transition probabilities for K-shell and M-shell electron excitations transitions in atomic sodium. The calculations were carried out by employing the ‘multi configuration Dirac–Fock method’, Breit interactions and ‘finite nuclear size corrections’ are included in the calculations, the transition probabilities were convoluted into ‘Breit–Wigner’ line shapes, and single 1s photoionization was also taken into account. In addition, the [1s]np and the [1s3s]nsn′p singlet–triplet energy splitting was calculated. Results of the calculations were compared with previous measurements of the photoabsorption spectrum of sodium near the K-edge, and a very good agreement was observed.

研究人员报告了一项关于 K 边附近钠的 X 射线光吸收光谱的新研究，涉及激发能量的计算以及钠原子中 K 层和 M 层电子激发跃迁的激发跃迁概率。计算是通过采用“多配置狄拉克-福克方法”进行的，计算中包括 Breit 相互作用和“有限核尺寸校正”，转换概率被卷积为“Breit-Wigner”线形，以及单个 1 s还考虑了光电离。此外，[1 s ] np和 [1 s 3 s ] nsn ′ p计算单线态-三线态能量分裂。将计算结果与之前对 K 边缘附近钠的光吸收光谱的测量结果进行比较，观察到非常好的一致性。