Abstract

The spectrum of La iv has been observed in a sliding spark discharge with the NBS 10.7-m normal incidence vacuum spectrograph and the NBS 10.7-m Eagle spectrograph in air. A total of 368 lines have been observed in the region from 300 to 5000 Å. About 190 lines have been classified as transitions between 49 energy levels. All levels of the 5p6, 5p5 5d, 6s, 6d, and 7s configurations as well as half of the levels of the 5p5 4f configuration have been located. Because of the greatly contracted 4f orbital, the lowest excited configuration is 5p5 4f. All configurations have been theoretically interpreted. The energy parameters determined from least-squares fits to the observed levels are compared with Hartree-Fock calculations. Some new measurements for La iii are presented that confirm the 1967 results of Odasbasi.

© 1979 Optical Society of America

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