Abstract

The spectrum of Ta vi produced with a sliding-spark discharge was photographed in the region of ~200–2000 Å utilizing grazing-incidence and normal-incidence spectrographs. A system of seventy excited energy levels was deduced from 228 spectral lines. These arise from excitations out of both the 4f and 5p closed shells of the 4f145s25p6 ground configuration, giving the observed configurations 4f13nl with nl = 5d, 6s, 6p, 6d, 7s and 5p5nl with nl = 5d, 6s, 6p. Radial integrals were fitted for all of these configurations. A value of 785 130 ± 400 cm−1 for the ionization energy was derived. A graph of lowest excited levels of 4f135d and 5p55d from Lu iv to Re viii predicts the crossing of these configurations after W vii.

© 1975 Optical Society of America

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