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, 3<i>d</i><sup>10</sup><i>nl</i>) includes the series <i>ns</i> (<i>n</i> = 4–7), <i>np</i> (<i>n</i> = 4–6), <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 4ƒ <sup>2</sup><i>F</i> term is inverted. The observed energy levels are compared with Hartree-Fock calculations. The ionization energy is determined from the ng series (<i>n</i> =5–8) to be 1 660 000 ± 200 cm<sup>−1</sup> (205.82 ± 0.03 eV).

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  1. E. Hinnov, "Highly ionized atoms in tokamak discharges," Phys. Rev. A 14,1533–1541 (1976).
  2. J. Reader, G. Luther, and N. Acquista, "Spectrum and energy levels of thirteen-times ionized molybdenum (Moxiv)," J. Opt. Soc. Am. 69, 144–149 (1979).
  3. 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).
  4. J. Reader and N. Acquista, "4s-4p Resonance Transitions in Highly Charged Cu- and Zn-like Ions," Phys. Rev. Lett. 39, 184–187 (1977).
  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 vacuum-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, YIV, ZrV, Nb VI, and Mo VII in the Vacuum Ultraviolet," J. Opt. Soc. Am. 62, 273–284 (1972).
  8. J. Reader and G. L. Epstein, "Analysis of the Spectrum of Quadruply Ionized Yttrium (Yv)," J. Opt. Soc. Am. 62, 619–622 (1972).
  9. R. Zalubas, J. Reader, and C. H. Corliss, "4s2 4p4-4s 4p5 transitions in five-times ionized yttrium (YVI)," J. Opt. Soc. Am. 66, 35–36 (1976).
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  11. B. Edlén, "Wavelength Measurements in the Vacuum Ultraviolet," Rep. Prog. Phys. 26, 181–212 (1963).
  12. R. L. Kelly and L. J. Palumbo, "Atomic and Ionic Emission Lines Below 2000 Angstroms-Hydrogen Through Krypton," Naval Research Laboratory Report 7599 (U.S. GPO, Washington, D.C., 1973).
  13. V. Kaufman and B. Edlèn, "Reference Wavelengths from Atomic Spectra in the Range 15 Å to 25000 Å," J. Phys. Chem. Ref. Data 3, 825–895 (1974).
  14. Optimization of the level values was done with the computer program ELCALC, due to L. Radziemski, Jr.
  15. A. W. Weiss, private communication, 1977.
  16. E. Luc-Koenig, "Doublet inversions in alkali-metal spectra: Relativistic and correlation effects," Phys. Rev. A 13, 2114–2122 (1976).
  17. K. T. Cheng and Y.-K. Kim, "Energy Levels, Wavelengths, and Transition Probabilities for Cu-like ions," At. ata Nucl. Data Tables 22, 547–563 (1978).
  18. 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, VA, 22161).

1979

1978

K. T. Cheng and Y.-K. Kim, "Energy Levels, Wavelengths, and Transition Probabilities for Cu-like ions," At. ata 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

E. Hinnov, "Highly ionized atoms in tokamak discharges," Phys. Rev. A 14,1533–1541 (1976).

E. Luc-Koenig, "Doublet inversions in alkali-metal spectra: Relativistic and correlation effects," Phys. Rev. A 13, 2114–2122 (1976).

R. Zalubas, J. Reader, and C. H. Corliss, "4s2 4p4-4s 4p5 transitions in five-times ionized yttrium (YVI)," J. Opt. Soc. Am. 66, 35–36 (1976).

1974

V. Kaufman and B. Edlèn, "Reference Wavelengths from Atomic Spectra in the Range 15 Å to 25000 Å," J. Phys. Chem. Ref. Data 3, 825–895 (1974).

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).

1963

B. Edlén, "Wavelength Measurements in the Vacuum Ultraviolet," Rep. Prog. Phys. 26, 181–212 (1963).

Acquista, N.

J. Reader, G. Luther, and N. Acquista, "Spectrum and energy levels of thirteen-times ionized molybdenum (Moxiv)," J. Opt. Soc. Am. 69, 144–149 (1979).

J. Reader and N. Acquista, "4s-4p Resonance Transitions in Highly Charged Cu- and Zn-like Ions," Phys. Rev. Lett. 39, 184–187 (1977).

Alexander, E.

Cheng, K. T.

K. T. Cheng and Y.-K. Kim, "Energy Levels, Wavelengths, and Transition Probabilities for Cu-like ions," At. ata 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).

Corliss, C. H.

Edlén, B.

B. Edlén, "Wavelength Measurements in the Vacuum Ultraviolet," Rep. Prog. Phys. 26, 181–212 (1963).

B. Edlén, "WellenlAngen und Termsysteme zu den Atomspektren der Elemente Lithium, Beryllium, Bor, Kohlenstoff, Stickstoff und Sauerstoff," Nova Acta Regiae Soc. Sci. Ups. (IV) 9, No. 6 (1934).

Edlèn, B.

V. Kaufman and B. Edlèn, "Reference Wavelengths from Atomic Spectra in the Range 15 Å to 25000 Å," J. Phys. Chem. Ref. Data 3, 825–895 (1974).

Ekberg, J. O.

J. Reader, G. L. Epstein, and J. O. Ekberg, "Spectra of Rb II, Sr III, YIV, ZrV, Nb VI, and Mo VII in the Vacuum Ultraviolet," J. Opt. Soc. Am. 62, 273–284 (1972).

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

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, VA, 22161).

Goldsmith, S.

Hinnov, E.

E. Hinnov, "Highly ionized atoms in tokamak discharges," Phys. Rev. A 14,1533–1541 (1976).

Kaufman, V.

V. Kaufman and B. Edlèn, "Reference Wavelengths from Atomic Spectra in the Range 15 Å to 25000 Å," J. Phys. Chem. Ref. Data 3, 825–895 (1974).

Kelly, R. L.

R. L. Kelly and L. J. Palumbo, "Atomic and Ionic Emission Lines Below 2000 Angstroms-Hydrogen Through Krypton," Naval Research Laboratory Report 7599 (U.S. GPO, Washington, D.C., 1973).

Kim, Y.-K.

K. T. Cheng and Y.-K. Kim, "Energy Levels, Wavelengths, and Transition Probabilities for Cu-like ions," At. ata Nucl. Data Tables 22, 547–563 (1978).

Luc-Koenig, E.

E. Luc-Koenig, "Doublet inversions in alkali-metal spectra: Relativistic and correlation effects," Phys. Rev. A 13, 2114–2122 (1976).

Luther, G.

Palumbo, L. J.

R. L. Kelly and L. J. Palumbo, "Atomic and Ionic Emission Lines Below 2000 Angstroms-Hydrogen Through Krypton," Naval Research Laboratory Report 7599 (U.S. GPO, Washington, D.C., 1973).

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).

Weiss, A. W.

A. W. Weiss, private communication, 1977.

Zalubas, R.

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. ata Nucl. Data Tables

K. T. Cheng and Y.-K. Kim, "Energy Levels, Wavelengths, and Transition Probabilities for Cu-like ions," At. ata Nucl. Data Tables 22, 547–563 (1978).

J. Opt. Soc. Am.

J. Phys. Chem. Ref. Data

V. Kaufman and B. Edlèn, "Reference Wavelengths from Atomic Spectra in the Range 15 Å to 25000 Å," J. Phys. Chem. Ref. Data 3, 825–895 (1974).

Phys. Rev.

E. Luc-Koenig, "Doublet inversions in alkali-metal spectra: Relativistic and correlation effects," Phys. Rev. A 13, 2114–2122 (1976).

Phys. Rev. A

E. Hinnov, "Highly ionized atoms in tokamak discharges," Phys. Rev. A 14,1533–1541 (1976).

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).

Rep. Prog. Phys.

B. Edlén, "Wavelength Measurements in the Vacuum Ultraviolet," Rep. Prog. Phys. 26, 181–212 (1963).

Rev. Sci. Instrum.

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

Other

B. Edlén, "WellenlAngen und Termsysteme zu den Atomspektren der Elemente Lithium, Beryllium, Bor, Kohlenstoff, Stickstoff und Sauerstoff," Nova Acta Regiae Soc. Sci. Ups. (IV) 9, No. 6 (1934).

R. L. Kelly and L. J. Palumbo, "Atomic and Ionic Emission Lines Below 2000 Angstroms-Hydrogen Through Krypton," Naval Research Laboratory Report 7599 (U.S. GPO, Washington, D.C., 1973).

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

A. W. Weiss, private communication, 1977.

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, VA, 22161).

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