Abstract

The spectrum of Nb XIII was observed with a low-inductance spark and a laser-produced plasma in the region from 70–630 Å on the 10.7-m grazing incidence spectrograph at NBS. From the identification of 38 lines, a system of 29 energy levels was determined. The level system (Cu I isoelectronic sequence, 3<i>d</i><sup>10</sup><i>nl</i>) includes the series <i>ns</i>(<i>n</i> = 4-6), <i>np</i>(<i>n</i> = 4-7), <i>nd</i>(<i>n</i> = 4-6), <i>nf</i>(<i>n</i> = 4-7), and <i>ng</i>(<i>n</i> = 5-8). The observed energy levels are compared with Hartree-Fock calculations. The ionization energy is determined from the <i>nf</i> and <i>ng</i> series to be 2 166 300 ± 300 cm<sup>-1</sup> (268.59 ± 0.04 eV).

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  1. E. Alexander, M. Even-Zohar, B. S. Fraenkel, and S. Goldsmith, "Classification of Transitions in the euv Spectra of YIX-XIII, ZrX-XIV, NbXI-XV, and MoXII-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, 1285–1288 (1979).
  4. J. Reader and N. Acquista, "Spectrum and energy levels of eleven-times ionized zirconium (Zr XII)," J. Opt. Soc. Am. 69, 1659–1662 (1979).
  5. J. Reader, G. Luther, and N. Acquista, "Spectrum and energy levels of thirteen-times ionized molybdenum (Mo XIV)," J. Opt. Soc. Am. 69, 144–149 (1979).
  6. U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).
  7. L. Å. Svensson and J. O. Ekberg, "The titanium vacuum-spark spectrum from 50 to 425 Å," Ark. Fys. 40, 145–164 (1969).
  8. 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).
  9. J. O. Ekberg, J. E. Hansen, and J. Reader, "Analysis of the Spectrum of Six-Times Ionized Niobium (Nb VII)," J. Opt. Soc. Am. 62, 1139–1142 (1972).
  10. J. Reader and N. Acquista, "4s24p4-4s4p5 transitions in Zr VII, 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. 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).

1979

1978

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).

1977

J. Reader and N. Acquista, "4s-4p resonance transitions in highly charged Cu- and Zn-like ions," Phys. Rev. Lett. 39, 184–187 (1977).

1976

1972

1971

1969

L. Å. Svensson and J. O. Ekberg, "The titanium vacuum-spark spectrum from 50 to 425 Å," Ark. Fys. 40, 145–164 (1969).

1967

U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).

Acquista, N.

Alexander, E.

Cheng, K. T.

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).

Cohen, L.

U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).

Ekberg, J. O.

Epstein, G. L.

Even-Zohar, M.

Feldman, U.

U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).

Fraenkel, B. S.

Froese, C.

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).

Goldsmith, S.

Hansen, J. E.

Kim, Y.-K.

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).

Luther, G.

Reader, J.

Svensson, L. Å.

L. Å. Svensson and J. O. Ekberg, "The titanium vacuum-spark spectrum from 50 to 425 Å," Ark. Fys. 40, 145–164 (1969).

Swartz, M.

U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).

Ark. Fys.

L. Å. Svensson and J. O. Ekberg, "The titanium vacuum-spark spectrum from 50 to 425 Å," Ark. Fys. 40, 145–164 (1969).

At. Data Nucl. Data Tables

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).

J. Opt. Soc. Am.

Phys. Rev. Lett.

J. Reader and N. Acquista, "4s-4p resonance transitions in highly charged Cu- and Zn-like ions," Phys. Rev. Lett. 39, 184–187 (1977).

Rev. Sci. Instrum.

U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).

Other

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

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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