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The Transitions 3s-3p and 3p-3d, and the Ionization Energy in the Na I Iso-electronic Sequence

Simple expressions in Z for the fine-structure intervals of 3p2P and 3d2D and for the transition energies 3s-3p and 3p-3d are derived from experimental data in the iso-electronic sequence of Na I-like spectra from S VI to Mo XXXII. The formulae provide a check on the accuracy of existing measurements and an easy interpolation of missing data. By a combination of the resulting energy values of 3d2D5/2,3/2 with the ionization energies of nf2F7/2,5/2, given by a formula based on the polarization concept, the series limits are derived from observations of the transitions 3d-nf. The results are summarized in a semi-empirical expression in Z for the ionization energy valid for Z ⩾ 16. Finally, interpolation formulae are given for the line strengths of the transitions 3s-3p and 3p-3d based on calculations by A. W. Weiss.