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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 66, Iss. 9 — Sep. 1, 1976
  • pp: 896–899

4s24p4-4s4p5 transitions in Zr VII, Nb VIII, and Mo IX

Joseph Reader and Nicolo Acquista  »View Author Affiliations

JOSA, Vol. 66, Issue 9, pp. 896-899 (1976)

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Spectra of ionized Zr, Nb, and Mo have been observed in sliding spark discharges at peak currents up to 4000 A on the 10.7 m normal and grazing incidence spectrographs at NBS. From these observations the group of 4s24p4-4s4p5 transitions in Zr VII, Nb VIII, and Mo IX have been identified and measured. The energy parameters obtained from least-squares fits to the resultant energy levels are compared with Hartree-Fock calculations.

© 1976 Optical Society of America

Joseph Reader and Nicolo Acquista, "4s24p4-4s4p5 transitions in Zr VII, Nb VIII, and Mo IX," J. Opt. Soc. Am. 66, 896-899 (1976)

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  1. M. S. Z. Chaghtai, "Term Analysis of Zr VII, Nb VIII and Mo IX", Phys. Scr. 1, 104–108 (1970).
  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 Report No. 4498 (available from Clearinghouse for Federal Scientific and Technical Information, National Bureau of Standards, U. S. Department of Commerce, Springfield, Va. 22151).
  4. J. Reader, C. H. Corliss, and R. Zalubas, "Reference Wavelengths of Y V in the 200–460 Å Region, " program and abstracts of Atomic Spectroscopy Symposium, National Bureau of Standards, Washington, D. C., 1975.
  5. G. L. Epstein and J. Reader, "Spectrum of doubly ionized yttrium (Y III)," J. Opt. Soc. Am. 65, 310–314 (1975).
  6. J. Reader and G. L. Epstein, "Analysis of the Spectrum of Quadruply Ionized Yttrium (Y V)," J. Opt. Soc. Am. 62, 619–622 (1972).
  7. 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).
  8. B. Edlén, "Wellenlängen 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).
  9. B. Edlén, "Wavelength Measurements in the Vacuum Ultraviolet," Rep. Prog. Phys. 26, 181–212 (1963).
  10. 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).
  11. V. Kaufman and B. Edlén, "Reference Wavelengths from Atomic Spectra in the Range 15 Å to 25000 Å," J. Phys. Chem. Ref. Data 3, 825–895 (1974).
  12. 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 (available from Clearinghouse for Federal Scientific and Technical Information, National Bureau of Standards, U. S. Department of Commerce, Springfield, Va, 22151).
  13. J. E. Hansen and W. Persson, "4s24p4 and 4s4p5 configurations in Rb IV and Sr V," J. Opt. Soc. Am. 64, 696–698 (1974). The values of Eav for the 4s24p4 configuration in this paper do not take into account the contribution of the effective interaction parameter α(4p4p) to the average energy of the configuration. To account for this contribution, the values of Eav for Kr III, Rb IV, and Sr v in this reference should be increased by 3.2α.
  14. Optimization of the level values was done with the computer program ELCALC communicated to us privately by L. J. Radziemski, Jr.
  15. M. S. Z. Chaghtai and K. Rahimullah, "Coupling Conditions and Level Structure of the np4-Configurations," Nuovo Cimento A 17, 162–170 (1973).

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