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The relativistic random-phase approximation is used to calculate the excitation energies and absorption oscillator strengths for the 3s²¹S₀-3s3p¹P₁, -3s4p¹P₁, -3s5p¹P₁, and -3s3p³P₁ transitions of selected elements of the magnesium isoelectronic sequence through nuclear charge $Z=92$. The results are compared with previous theoretical and experimental values. The data plotted as a function of Z^-1 enable us to study deviations from the predictions of the nonrelativistic Z-expansion theory.
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Shorer et al. (1977) studied this question.
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