Abstract
The spectrum of Y xi was observed with a low-inductance vacuum spark and a laser-produced plasma in the region from 70 to 630 Å on the 10.7-m grazing-incidence spectrograph at NBS. From the identification of 40 lines, a system of 29 energy levels was determined. The level system (Cu ii isoelectronic sequence, 3d 10nl) includes the series ns (n=4 –7), np (n=4–6), nd (n=4–6), nf (n =4 – 7), and ng (n =5–8). The 4f 2F term is inverted. The observed energy levels are compared with Hartree-Fock calculations. The ionization energy is determined from the ng series (n =5 – 8) to be 1 660 000 ± 200 cm−1 (205.82 ± 0.03 eV).
© 1979 Optical Society of America
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