Abstract

A study of Mg IV between 80 and 2100 Å has led to the classification of 243 lines. A total of 23 odd and 64 even levels have been identified as belonging to the 2<i>s</i><sup>2</sup><i>p</i><sup>5</sup>, 2<i>s</i>2<i>p</i><sup>6</sup> , 2<i>s</i>2<i>p</i><sup>5</sup>3<i>s</i>, 2<i>s</i><sup>2</sup>2<i>p</i><sup>4</sup>3<i>p</i>, 2<i>s</i><sup>2</sup>2<i>p</i><sup>4</sup><i>ns</i>, and 2<i>s</i><sup>2</sup>2<i>p</i><sup>4</sup><i>nd</i> (<i>n</i> = 3, 4, 5) configurations. Matrix diagonalizations and least-squares fits to the observed levels lead to well-defined radial integrals and verify the level assignments. On the basis of comparisons in the F I isoelectronic sequence, designation changes are suggested for some 2<i>p</i><sup>4</sup>(<sup>3</sup><i>P</i>)3<i>d</i> levels of Na III, Al V, Si VI, P VII, and S VIII. New levels are given for Na III and Al V, and some previously listed levels in Na III and S VIII are rejected as unreal. An ionization energy of 880 800 cm<sup>-1</sup> is given for Mg VI.

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