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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 71, Iss. 4 — Apr. 1, 1981
  • pp: 434–441

4s24p3-4s4p4 and 4s24p3-4s24p25s transitions in Y VII, Zr VIII, Nb Ix, and Mo x

Joseph Reader and Nicolo Acquista  »View Author Affiliations

JOSA, Vol. 71, Issue 4, pp. 434-441 (1981)

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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 4s24p3-4s4p4 transitions in Y VII, Zr VIII, Nb IX, and Mo x have been identified. The 4s24p3-4s24p25s transitions in Y VII-Mo X, previously identified by Rahimullah et al. [Phys. Scr. 14, 221–223 (1976); 18,96–106 (1978)], have been confirmed. InY VII the 4s24p3-4s24p26s and 4s4p4-4p5 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.

Joseph Reader and Nicolo Acquista, "4s24p3-4s4p4 and 4s24p3-4s24p25s transitions in Y VII, Zr VIII, Nb Ix, and Mo x," J. Opt. Soc. Am. 71, 434-441 (1981)

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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).

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