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

Spectrum and energy levels of twelve-times ionized niobium (Nb xiii)

Joseph Reader and Nicolo Acquista
J. Opt. Soc. Am. 70(3) 317-321 (1980)

Spectrum and energy levels of ten-times ionized yttrium (Y xi)

Joseph Reader and Nicolo Acquista
J. Opt. Soc. Am. 69(9) 1285-1288 (1979)

Spectrum and energy levels of nine-times ionized strontium (Sr x)

Nicolo Acquista and Joseph Reader
J. Opt. Soc. Am. 71(5) 569-573 (1981)

Spectrum and energy levels of thirteen-times ionized molybdenum (Mo xiv)

Joseph Reader, Gabriel Luther, and Nicolo Acquista
J. Opt. Soc. Am. 69(1) 144-149 (1979)

Spectrum and energy levels of seven-times-ionized krypton (Kr viii) and resonance lines of eight-times-ionized krypton (Kr ix)

Joseph Reader, Nicolo Acquista, and Victor Kaufman
J. Opt. Soc. Am. B 8(3) 538-547 (1991)