Abstract

The spectrum of the copperlike ion Rb ix was observed with a low-inductance spark and a 10.7-m grazing-incidence spectrograph from 70 to 630 Å. From the identification of 18 lines, a system of 16 energy levels of the type 3d10nl was determined. The level system includes the configurations ns (n = 4–7), np (n = 4–7), nd (n = 4), nf (n = 4), and ng (n = 6). The 4f2F term is inverted. The observed energy levels are compared with relativistic and nonrelativistic Hartree–Fock calculations. The ionization energy derived from the 3d10ns and np series is 1 214 900 ± 200 cm−1 (150.63 ± 0.02 eV).

© 1984 Optical Society of America

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