Abstract

The spectrum of mercury was photographed in the 400–900-Å region on a 3-m normal-incidence spectrograph using a triggered spark source. The new observations, aided by Hartree–Fock calculations, have led to the complete revision of Hg iv analysis reported in the literature. The ground state of Hg iv has been found to be the 5d9 configuration, with a 2D doublet separation of 15 684.7 cm−1, instead of the 5d86s configuration as reported earlier. Twenty-one levels of the 5d86p configuration have been established, and thirty lines are now classified in the spectrum. Least-squares-fitted calculations support the analysis.

© 1989 Optical Society of America

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