Abstract

The 4p6nl spectrum of Nb4+ was measured and analyzed. The spectrum was excited in a vacuum sliding spark source with a peak current of 800 A and a pulse width of 70 μsec. The analysis of the spectrum has extended the 12 known lines to 84 and the 10 known levels to 30. The ionization energy was calculated to be 407897 ± 40 cm−1. There is strong evidence that the 4p54d2 configuration interacts strongly with the 4p6nf configuration. In addition, the hyperfine splitting of the 4p66s level has been observed and measured to be 1.1 cm−1.

© 1981 Optical Society of America

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