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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 69, Iss. 12 — Dec. 1, 1979
  • pp: 1659–1662

Spectrum and energy levels of eleven-times ionized zirconium (Zr XII)

Joseph Reader and Nicolo Acquista  »View Author Affiliations

JOSA, Vol. 69, Issue 12, pp. 1659-1662 (1979)

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The spectrum of Zr XII was observed with a low-inductance 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 36 lines, a system of 28 energy levels was determined. The level system (Cu I isoelectronic sequence, 3d10nl) includes the series np (n = 4-6), nd (n = 4-6), nƒ (n = 4-8), and ng (n = 5-7). The 4ƒ 2F term has an anomalously small fine-structure interval (1 ±3 cm-1). The ionization energy is determined from the ng series (n = 5-7) to be 1 905 500 ± 200 cm-1 (236.25 ± 0.03 eV).

Joseph Reader and Nicolo Acquista, "Spectrum and energy levels of eleven-times ionized zirconium (Zr XII)," J. Opt. Soc. Am. 69, 1659-1662 (1979)

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  1. E. Alexander, M. Even-Zohar, B. S. Fraenkel, and S. Goldsmith, "Classification of transitions in the euv spectra of Y IX–XIII, Zr X–XIV, Nb XI–XV, and Mo XII–XVI," J. Opt. Soc. Am. 61, 508–514(1971)
  2. J. Reader and N. Acquista, "4s-4p resonance transitions in highly charged Cu- and Zn-like ions," Phys. Rev. Lett. 39, 184–187 (1977).
  3. J. Reader and N. Acquista, "Spectrum and energy levels of ten-times ionized yttrium (Y XI)," J. Opt. Soc. Am. 69, 1285– (1979).
  4. J. Reader, G. Luther, and N. Acquista, "Spectrum and energy levels of thirteen-times ionized molybdenum (Mo XIV)," J. Opt. Soc. Am. 69, 144– (1979).
  5. U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).
  6. L. Å. Svensson and J. O. Ekberg, "The titanium vancuum-spark spectrum from 50 to 425 Å," Ark. Fys. 40, 145–164 (1969).
  7. J. Reader, G. L. Epstein, and J. O. Ekberg, "Spectra of Rb II, Sr III Y IV, Zr V, Nb VI, and Mo VII in the vacuum ultraviolet," J. Opt. Soc. Am. 62, 273–284 (1972).
  8. J. Reader and N. Acquista, "Spectrum and energy levels of four-times ionized zirconium (Zr V)," J. Opt. Soc. Am. 69, 239–253 (1979).
  9. J. O. Ekberg, J. E. Hansen, and J. Reader, "Analysis of the Spectrum of Five-times Ionized Zirconium (Zr VI)," J. Opt. Soc. Am. 62, 1134–1139 (1972).
  10. J. Reader and N. Acquista, "4s24p4 - 4s4p5 transitions in ZrVII, Nb VIII, and Mo IX," J. Opt. Soc. Am. 66, 896–899 (1976).
  11. Optimization of the level values was done with the computer program ELCALC, due to L. Radziemski, Jr.
  12. K. T. Cheng and Y.-K. Kim, "Energy Levels, Wavelengths, and Transition Probabilities for Cu-like Ions," At. Data Nucl. Data Tables 22, 547–563 (1978).
  13. A. E. Livingston, H. G. Berry, L. J. Curtis, and R. M. Schectman, "Energies and lifetimes of excited states in Copper-like Kr VIII," Phys. Rev. A (to be published).
  14. C. Froese, "Numerical Solution of the Hartree-Fock Equations," Can. J. Phys. 41, 1895–1910 (1963), and C. Froese-Fischer and M. Wilson, "Programs for Atomic Structure Calculations," Argonne National Laboratory Report No. 7404 (National Technical Information Service, Springfield, Virginia 22161).

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