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Data are given in support of the recently proposed formula ζ   np   n * 3 =0.450 Z  2.33 cm -1 ( Z ⩾ 5). The table includes evaluations of this formula, which are probably accurate to ~ 15 percent for all atoms Z = 10 to 90. For many (core) np configurations, the accuracy of ζ   np  from the formula is greater than that to be expected from fitting the observed levels to intermediate coupling theory.

Table of spin-orbit energies for p-electrons in neutral atomic (core) np configurations