Abstract

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, 3<i>d</i><sup>10</sup><i>nl</i>) includes the series <i>np</i> (<i>n</i> = 4-6), <i>nd</i> (<i>n</i> = 4-6), <i>n</i>ƒ (<i>n</i> = 4-8), and <i>ng</i> (<i>n</i> = 5-7). The 4ƒ <sup>2</sup>F term has an anomalously small fine-structure interval (1 ±3 cm<sup>-1</sup>). The ionization energy is determined from the ng series (<i>n</i> = 5-7) to be 1 905 500 ± 200 cm<sup>-1</sup> (236.25 ± 0.03 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 Y IX–XIII, Zr X–XIV, Nb XI–XV, and Mo XII–XVI," J. Opt. Soc. Am. 61, 508–514(1971)
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  11. Optimization of the level values was done with the computer program ELCALC, due to L. Radziemski, Jr.
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  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).

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 vancuum-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.

Berry, H. G.

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).

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).

Curtis, L. J.

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).

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).

Livingston, A. E.

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).

Luther, G.

Radziemski, Jr., L.

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

Reader, J.

Schectman, R. M.

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).

Svensson, L. Å.

L. Å. Svensson and J. O. Ekberg, "The titanium vancuum-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 vancuum-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.

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).

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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