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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 69, Iss. 9 — Sep. 1, 1979
  • pp: 1285–1288

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

Joseph Reader and Nicolo Acquista  »View Author Affiliations


JOSA, Vol. 69, Issue 9, pp. 1285-1288 (1979)
http://dx.doi.org/10.1364/JOSA.69.001285


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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, 3d10nl) 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 4ƒ 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).

Citation
Joseph Reader and Nicolo Acquista, "Spectrum and energy levels of ten-times ionized yttrium (Y XI)," J. Opt. Soc. Am. 69, 1285-1288 (1979)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-69-9-1285


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References

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  14. Optimization of the level values was done with the computer program ELCALC, due to L. Radziemski, Jr.
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