The spectrum of selenium was photographed in the 400–1200-Å wavelength region on a variety of spectrographs by using a triggered spark source. Seventeen of the eighteen levels of the 3d⁹4d configuration of Se VII have been established. The revision of the J = 1 levels of the 3d⁹5p and 3d⁹nƒ (n = 4–7) configurations has led to a revised value of the ionization limit of Se VII as 3d^{9 2}D_5/2 = 1 252 800 ± 100 cm⁻¹ (155.3 eV). In Se VIII all levels of the 3d⁸4s configuration and missing levels of the 3d⁸4p configuration have been determined. Several levels of the 3d⁸4p configuration have also been revised. The parametric calculations support both analyses. Sixty-four additional lines have been classified in Se VII, and seventy-four additional lines have been classified in Se VIII.

© 1984 Optical Society of America

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