Abstract

Lines occurring as satellites on the long-wavelength side of the 3d10–3d94p resonance lines of Ni-like ions have been investigated with a low-inductance vacuum spark and a 10.7-m spectrograph for the elements Y, Zr, Nb, and Mo. The lines are interpreted as 3d104s–3d94s4p and 3d104p–3d94p2 transitions in the Cu-like ions Y xi, Zr xii, Nb xiii, and Mo xiv and 3d104s2–3d94s24p transitions in the Zn-like ions Y x, Zr xi, Nb xii, and Mo xiii. The spectra of the Cu-like ions were interpreted by generalized least-squares fits for the energy levels of the sequence of four ions. Thirty-nine levels of 3d94s4p were interpreted simultaneously with a root-mean-square deviation of 122 cm−1; forty-four levels of 3d94p2 were interpreted in the same way with a root-mean-square deviation of 200 cm−1. Line identifications and energy levels were obtained for the 3d107p configuration of the Cu-like ions Y xi–Mo xiv.

© 1981 Optical Society of America

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References

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  1. J. Reader, G. Luther, and N. Acquista, “Spectrum and energy levels of thirteen-times ionized molybdenum (Mo xiv),” J. Opt. Soc. Am. 69, 144–149 (1979).
    [Crossref]
  2. J. Reader and N. Acquista, “Spectrum and energy levels of eleven-times ionized zirconium (Zr xii),” J. Opt. Soc. Am. 69, 1659–1662 (1979).
    [Crossref]
  3. J. Reader and N. Acquista, “Spectrum and energy levels of ten-times ionized yttrium (Y xi),” J. Opt. Soc. Am. 69, 1285–1288 (1979).
    [Crossref]
  4. J. Reader and N. Acquista, “Spectrum and energy levels of twelve-times ionized niobium (Nb xiii),” J. Opt. Soc. Am. 70, 317–321 (1980).
    [Crossref]
  5. P. G. Burkhalter, J. Reader, and R. D. Cowan, “Spectra of Mo xiii–xviii from a laser-produced plasma and a low-inductance vacuum spark,” J. Opt. Soc. Am. 70, 912–919 (1980).
    [Crossref]
  6. J. Reader and A. Ryabtsev, “3p63d8–3p53d9 transitions in Sr xiii, Y xiv, Zr xv, Nb xvi, and Mo xvii,” J. Opt. Soc. Am. 71, 231–237 (1981).
    [Crossref]
  7. C. Froese, “Numerical solution of the Hartree–Fock equations,” Can. J. Phys. 41, 1895–1910 (1963).
    [Crossref]
  8. L. J. Curtis and et al., “Energy levels and transition probabilities in Mo xiv,” Phys. Scr. 16, 72–76 (1977).
    [Crossref]
  9. E. Alexander and et al., “Classification of transitions in the euv spectra of Y ix–xiii, Zr x–xiv, Nb xi–xv, and Mo xii–xvi,” J. Opt. Soc. Am. 61, 508–514 (1971).
    [Crossref]

1981 (1)

1980 (2)

1979 (3)

1977 (1)

L. J. Curtis and et al., “Energy levels and transition probabilities in Mo xiv,” Phys. Scr. 16, 72–76 (1977).
[Crossref]

1971 (1)

1963 (1)

C. Froese, “Numerical solution of the Hartree–Fock equations,” Can. J. Phys. 41, 1895–1910 (1963).
[Crossref]

Acquista, N.

Alexander, E.

Burkhalter, P. G.

Cowan, R. D.

Curtis, L. J.

L. J. Curtis and et al., “Energy levels and transition probabilities in Mo xiv,” Phys. Scr. 16, 72–76 (1977).
[Crossref]

Froese, C.

C. Froese, “Numerical solution of the Hartree–Fock equations,” Can. J. Phys. 41, 1895–1910 (1963).
[Crossref]

Luther, G.

Reader, J.

Ryabtsev, A.

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Figures (1)

Fig. 1
Fig. 1

Comparison of the spectra of Y xi, Zr xii, Nb xiii, and Mo xiv showing isoelectronic regularities in the region of the strongest 3d104s–3d94s4p transitions (capital letters), 3d104p–3d94p2 transitions (lower-case letters), and 3d104s–3d107p transitions (Greek letters). Complete designations are given in Tables 1 and 7. Lines marked with dots pertain to higher ionization stages in Y; two of them have been classified as Y xiv.6

Tables (9)

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Table 1 Lines Classified as 3d104s–3d9 4s4p and 3d104p–3d94p2 Transitions in Y xi, Zr xxi, Nb xiii, and Mo xiva

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Table 2 Experimental Energy Levels of the 3d94s4p Configurations of Y xi, Zr xii, Nb xiii, and Mo xiva

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Table 3 Fitted Scaling Factors for the Hartree–Fock Integrals

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Table 4 Fitted Parameter Values (in cm−1) for the 3d94s4p and 3d94p2 Configurations of Y xi, Zr xii, Nb xiii, and Mo xiv

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Table 5 Hartree–Fock Integrals (in cm−1) for the configurations 3d94s4p, 3d94p2, and 3d94s4d of Y xi, Zr xii, Nb xiii, and Mo xiv

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Table 6 Experimental Levels of 3d94p2 a

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Table 7 3d104s–3d107p Transitions in Y xi, Zr xii, Nb xiii, and Mo xiv

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Table 8 Energy Levels (in cm−1) of the 3d107p Configurations of Y xi, Zr xii, Nb xiii, and Mo xiva

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Table 9 3d–4p Transitions in Ni-like and Zn-like Ions