Abstract

The transition probabilities of the lines <sup>1</sup><i>S</i><sub>0</sub>-<sup>3</sup><i>P</i><sub>0</sub> and <sup>1</sup><i>S</i><sub>0</sub>-<sup>3</sup><i>P</i><sub>2</sub> of the <i>S</i><sup>2</sup>-<i>sp</i> arrays in Mg I, Zn I, Cd I, and Hg I, which arise by the interactions of the nuclear moments with the electrons, are computed for each odd isotope individually and for the naturally occurring isotopic mixture. The individual hyperfine structure component transition probabilities are given for the <sup>1</sup><i>S</i><sub>0</sub>-<sup>3</sup><i>P</i><sub>2</sub> lines. Part of the intensity of the lines arises from the interaction of <sup>3</sup><i>P</i><sub>0</sub> or <sup>3</sup><i>P</i><sub>2</sub> with <sup>3</sup><i>P</i><sub>1</sub> and part from the interaction of <sup>3</sup><i>P</i><sub>0</sub> or <sup>3</sup><i>P</i><sub>2</sub> with <sup>1</sup><i>P</i><sub>1</sub>, the former being more important for <sup>1</sup><i>S</i><sub>0</sub>-<sup>3</sup><i>P</i><sub>0</sub> and the latter for <sup>1</sup><i>S</i><sub>0</sub>-<sup>3</sup><i>P</i><sub>2</sub>. Spin-spin and spin-other-orbit interactions in Mg I are calculated for the 3<i>s</i>3<i>p</i><sup>3</sup><i>P</i> term and compared with observations.

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