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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 72, Iss. 4 — Apr. 1, 1982
  • pp: 476–492

Spectrum and energy levels of triply ionized yttrium (Y IV)

Gabriel L. Epstein and Joseph Reader  »View Author Affiliations

JOSA, Vol. 72, Issue 4, pp. 476-492 (1982)

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The spectrum of Y IV was observed in the region from 300 to 5000 Å with the 10.7-m normal-incidence vacuum spectrograph and the 10.7-m Eagle spectrograph in air at the National Bureau of Standards. The light source was a sliding spark discharge. About 560 lines were classified as transitions between 129 energy levels. The observed level system (Kr I isoelectronic sequence) includes nearly all levels of the 4s24p6, 4s24p55s, 6s, 7s, 4d, 5d, 6d, 4ƒ, 5ƒ, 5g, 6g, and 4s4p64d configurations. About 190 lines remain unclassified. All observed configurations have been theoretically interpreted. The energy parameters determined by least-squares fits to the observed levels are compared with Hartree-Fock calculations. The ionization energy as derived from the 4p5ng (n = 5, 6) levels is 488 830 ± 20 cm-1 (60.608 ± 0.002 eV).

© 1982 Optical Society of America

Gabriel L. Epstein and Joseph Reader, "Spectrum and energy levels of triply ionized yttrium (Y IV)," J. Opt. Soc. Am. 72, 476-492 (1982)

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  1. G. L. Epstein and J. Reader, "Resonance lines of Y IV and La IV," J. Opt. Soc. Am. 59, 1525 (1969).
  2. 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).
  3. C. B. Ross, "Wavelengths and energy levels of singly ionized copper, Cu II," Los Alamos Scientific Laboratory rep. no. 4498 (National Technical Information Service, Springfield, Va., 1970).
  4. H. M. Crosswhite, "The iron-neon hollow cathode spectrum," J. Res. Nat. Bur. Stand. Sect. A 79, 17–69 (1975).
  5. A. Giachetti, R. W. Stanley, and R. Zalubas, "Proposed secondary-standard wavelengths in the spectrum of thorium," J. Opt. Soc. Am. 60, 474–489 (1970).
  6. R. L. Kelly and L. J. Palumbo, "Atomic and ionic emission lines below 2000 angstroms—hydrogen through krypton, "Naval Research Laboratory rep. no. 7599 (U.S. Government Printing Office, Washington, D.C., 1973).
  7. B. A. Palmer, "The first spectrum of yttrium and an automatic comparator for its measurement," Ph.D. Thesis, Purdue University, 1977 (University Microfilms International, Ann Arbor, Mich. 48106, order no. 77-30), p. 119.
  8. R. L. Kelly, "Atomic emission lines in the near ultraviolet; hydrogen through krypton," NASA Technical Memorandum 80268 (National Technical Information Service, Springfield, Va., 1979).
  9. C. Froese, "Numerical solution of the Hartree-Fock equations," Can. J. Phys. 41, 1895–1910 (1963); C. Froese-Fischer and M. Wilson, "Programs of atomic structure calculations," Argonne National Laboratory rep. no. 7404 (National Technical Information Service, Springfield, Va., 1968).
  10. J. Reader and G. L. Epstein, "Zeeman effect and revised analysis of singly ionized rubidium (Rb II)," J. Opt. Soc. Am. 63, 1153–1167 (1973).
  11. J. Reader, "Spectrum and energy levels of singly ionized rubidium (Rb II)," J. Opt. Soc. Am. 65, 286–301 (1975).
  12. W. Persson and S. Valind, "The spectrum of doubly ionized strontium (Sr III)," Phys. Scr. 5, 187–200 (1972).
  13. J. E. Hansen and W. Persson, "Configuration interaction in the spectrum of Sr III," Phys. Scr. 8, 279–284 (1973).
  14. Optimization of the level values was done with the computer program ELCALC, provided by L. J. Radziemski, Jr., Los Alamos National Laboratory, Los Alamos, N.M. 87544.
  15. J. Reader and A. Ryabtsev, "3p63d8-3p53d9 transitions in Sr XIII, Y XIV, Zr XV, Nb CVI, and Mo XVII," J. Opt. Soc. Am. 71, 231–237 (1981).
  16. J. Reader and N. Acquista, "Spectrum and energy levels of four-times ionized zirconium (Zr V)," J. Opt. Soc. Am. 69, 239–253 (1979).
  17. N. Acquista and J. Reader, "Spectrum and energy levels of triply ionized zirconium (Zr IV)," J. Opt. Soc. Am. 70, 789–792, (1980).
  18. J. E. Hansen, W. Persson, and A. Borgström, "3s3p63d-3s23p5nf interaction in Ca III and identification of the 3s3p63d configuration," Phys. Scr. 11, 31–37 (1975).
  19. L. Å. Svensson, "The spectrum of four-times-ionized titanium, Ti v," Phys. Scr. 13, 235–239 (1976).
  20. J. O. Ekberg, "The spectrum of five-times-ionized vanadium," Phys. Scr. 13, 111–116 (1976).
  21. J. O. Ekberg, "The spectrum of six-times-ionized chromium, Cr VII," Phys. Scr. 13, 245–249 (1976).

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