Abstract

Spectra of ionized Y, Zr, Nb, and Mo have been observed in sliding-spark and triggered-spark discharges on 10.7-m normal- and grazing-incidence spectrographs at the National Bureau of Standards in Washington, D.C. From these observations the 4<i>s</i><sup>2</sup>4<i>p</i><sup>3</sup>-4<i>s</i>4<i>p</i><sup>4</sup> transitions in Y VII, Zr VIII, Nb IX, and Mo x have been identified. The 4<i>s</i><sup>2</sup>4<i>p</i><sup>3</sup>-4<i>s</i><sup>2</sup>4<i>p</i><sup>2</sup>5<i>s</i> transitions in Y VII-Mo X, previously identified by Rahimullah <i>et al.</i> [Phys. Scr. <b>14</b>, 221–223 (1976); <b>18</b>,96–106 (1978)], have been confirmed. InY VII the 4<i>s</i><sup>2</sup>4<i>p</i><sup>3</sup>-4<i>s</i><sup>2</sup>4<i>p</i><sup>2</sup>6<i>s</i> and 4<i>s</i>4<i>p</i><sup>4</sup>-4<i>p</i><sup>5</sup> transitions also have been found. The parameters obtained from least-squares fits to the energy levels are compared with Hartree—Fock calculations. Preliminary values of the ionization energies have been determined as 110.02 ± 0.15 eV for Y VII, 133.7 ± 0.5 eV for Zr VIII, 159.2 ± 0.7 eV for Nb IX, and 186.4 ± 1.2 eV for Mo X.

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  1. K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "4p-5s transitions in Y VII, VIII, Zr VIII, Ix, Nb IX, X, and Mo X, XI," Phys. Scr. 14, 221–223 (1976).
  2. K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "The 4p-4d transitions of Y VI, VII, VIII, Zr VII, VIII, IX, Nb VIII, IX, X, and Mo IX, X, XI," Phys. Scr. 18, 96–106 (1978).
  3. 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).
  4. U. Feldman, M. Swartz, and L. Cohen, "Vacuum ultraviolet source," Rev. Sci. Instrum. 38, 1372–1373 (1967).
  5. J. Reader and N. Acquista, "4s24p4-4s4p5 transitions in Zr VII, Nb VIII, and Mo IX," J. Opt. Soc. Am. 66, 896–899 (1976).
  6. J. C. Boyce, "The spectra of argon in the extreme ultraviolet," Phys. Rev. 48, 396–402 (1935).
  7. 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. Government Printing Office, Washington, D.C., 1973).
  8. C. Froese, "Numerical solution of the Hartree–Fock equations," Can. J. Phys. 41, 1895–1910 (1963); C. Froese-Fischer and M. Wilson, "Programs for atomic structure calculations," Argonne National Laboratory Report no. 7404 (National Technical Information Service, Springfield, Va. 22161).
  9. R. Zalubas, J. Reader, and C. H. Corliss, "4s24p4-4s4p5 transitions in five-times-ionized yttrium (Y VI)," J. Opt. Soc. Am. 66, 35–36 (1976).
  10. Optimization of the level values was done with the computer program ELCALC provided by L. Radziemski, Jr., Los Alamos Scientific Laboratory, Los Alamos, N.M. 87544.
  11. G. L. Epstein and J. Reader, "Spectrum of doubly-ionized yttrium (Y III)," J. Opt. Soc. Am. 65, 310–314 (1975).
  12. J. Reader and N. Acquista, "Spectrum and energy levels of ten-times ionized yttrium (Y XI)," J. Opt. Soc. Am. 69, 1285–1288 (1979).

1979

1978

K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "The 4p-4d transitions of Y VI, VII, VIII, Zr VII, VIII, IX, Nb VIII, IX, X, and Mo IX, X, XI," Phys. Scr. 18, 96–106 (1978).

1976

1975

1972

1967

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

1935

J. C. Boyce, "The spectra of argon in the extreme ultraviolet," Phys. Rev. 48, 396–402 (1935).

Acquista, N.

Boyce, J. C.

J. C. Boyce, "The spectra of argon in the extreme ultraviolet," Phys. Rev. 48, 396–402 (1935).

Chaghtai, M. S. Z.

K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "The 4p-4d transitions of Y VI, VII, VIII, Zr VII, VIII, IX, Nb VIII, IX, X, and Mo IX, X, XI," Phys. Scr. 18, 96–106 (1978).

K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "4p-5s transitions in Y VII, VIII, Zr VIII, Ix, Nb IX, X, and Mo X, XI," Phys. Scr. 14, 221–223 (1976).

Cohen, L.

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

Corliss, C. H.

Ekberg, J. O.

Epstein, G. L.

Feldman, U.

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

Froese, C.

C. Froese, "Numerical solution of the Hartree–Fock equations," Can. J. Phys. 41, 1895–1910 (1963); C. Froese-Fischer and M. Wilson, "Programs for atomic structure calculations," Argonne National Laboratory Report no. 7404 (National Technical Information Service, Springfield, Va. 22161).

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. Government Printing Office, Washington, D.C., 1973).

Khatoon, S.

K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "The 4p-4d transitions of Y VI, VII, VIII, Zr VII, VIII, IX, Nb VIII, IX, X, and Mo IX, X, XI," Phys. Scr. 18, 96–106 (1978).

K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "4p-5s transitions in Y VII, VIII, Zr VIII, Ix, Nb IX, X, and Mo X, XI," Phys. Scr. 14, 221–223 (1976).

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. Government Printing Office, Washington, D.C., 1973).

Rahimullah, K.

K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "The 4p-4d transitions of Y VI, VII, VIII, Zr VII, VIII, IX, Nb VIII, IX, X, and Mo IX, X, XI," Phys. Scr. 18, 96–106 (1978).

K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "4p-5s transitions in Y VII, VIII, Zr VIII, Ix, Nb IX, X, and Mo X, XI," Phys. Scr. 14, 221–223 (1976).

Reader, J.

Swartz, M.

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

Zalubas, R.

J. Opt. Soc. Am.

Phys. Rev.

J. C. Boyce, "The spectra of argon in the extreme ultraviolet," Phys. Rev. 48, 396–402 (1935).

Phys. Scr.

K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "4p-5s transitions in Y VII, VIII, Zr VIII, Ix, Nb IX, X, and Mo X, XI," Phys. Scr. 14, 221–223 (1976).

K. Rahimullah, M. S. Z. Chaghtai, and S. Khatoon, "The 4p-4d transitions of Y VI, VII, VIII, Zr VII, VIII, IX, Nb VIII, IX, X, and Mo IX, X, XI," Phys. Scr. 18, 96–106 (1978).

Rev. Sci. Instrum.

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

Other

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. Government Printing Office, Washington, D.C., 1973).

C. Froese, "Numerical solution of the Hartree–Fock equations," Can. J. Phys. 41, 1895–1910 (1963); C. Froese-Fischer and M. Wilson, "Programs for atomic structure calculations," Argonne National Laboratory Report no. 7404 (National Technical Information Service, Springfield, Va. 22161).

Optimization of the level values was done with the computer program ELCALC provided by L. Radziemski, Jr., Los Alamos Scientific Laboratory, Los Alamos, N.M. 87544.

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