Abstract

The 5s25p4–5s5p5 transitions of Cs iv, Ba v, and La vi were observed with a sliding spark discharge and a 10.7-m normal-incidence spectrograph. The region of observation was 539–1282 Å. The energy parameters derived from least-squares fits to the experimental levels are compared with Hartree–Fock (HF) calculations. The fitted/HF ratios for the 5s25p4 configurations of the ions Te i–La vi are compared with the fitted/HF ratios for the 4s24p4 configurations of the ions Se i–Mo ix.

© 1983 Optical Society of America

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