Abstract

The spectrum of zirconium was observed in the region from 200 to 2670 Å with a sliding-spark discharge on the 10.7-m normal-and grazing-incidence spectrographs at NBS. About 580 lines were assigned to Zr v. From these observations the energy level system of Zr v (Kr i isoelectronic sequence, ground state 4s 24p 6 1S0) has been extended to the complete 4s 2 4p 5 5s, 6s, 7s, 5p, 4d, 5d, 4f, 5g, and 4s 4p 6 4d configurations and the nearly complete 4s 24p 5 6d and 6g configurations. About 330 lines have been classified. All observed configurations have been theoretically interpreted. The energy parameters determined by least-squares fits to the observed levels are compared with Hartree-Fock calculations. The ionization energy derived from the 4p 5 n g, n = 5,6 levels is 648 050 ± 60 cm−1 (80.349 ± 0.007 eV).

© 1979 Optical Society of America

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