Abstract

The 3d43d34f transitions in Ni vii excited in vacuum spark and sliding spark sources and photographed with a high resolution were analyzed. Approximately 250 spectral lines were classified in the 127–158-Å wavelength region, and 134 energies of 3d34f configuration were determined. The effects of interaction of the 3d34f configuration with the 3p53d5 and 3d35p configurations in Ni vii have been discussed. The parametric least-squares-fitting calculations by use of a Cowan computer code in the frame of Hartree–Fock method have confirmed the results of the present analysis.

© 2005 Optical Society of America

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References

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  1. G. J. van het Hof, A. J. J. Raassen, P. H. M. Uylings, L. I. Podobedova, and A. N. Ryabtsev, "Extension of the analysis of the 3d4-3d³4p transition array in Ni VII," Phys. Scr. 39, 458-467 (1989).
    [CrossRef]
  2. A. A. Ramonas and A. N. Ryabtsev, "The spectra of Mn VII-Cu XI ions of the K I isoelectronic sequence," Sov. Opt. Spectrosc. 48, 348-355 (1980).
  3. G. J. van het Hof, J. O. Ekberg, and A. I. Nilssen, "Extension of the analysis of Ni IX," Phys. Scr. 41, 252-256 (1990).
    [CrossRef]
  4. A. V. Loginov and A. N. Ryabtsev, "Spectrum of Ni VIII," Sov. Opt. Spectrosc. 65, 1362-1366 (1988).
  5. A. J. J. Raassen, "Analysis of the sixth spectrum of nickel (Ni VI)," Physica C 100, 404-424 (1980).
    [CrossRef]
  6. L. A. Svensson and J. O. Ekberg, "The titanium vacuum spark spectrum," Ark. Fys. 40, 145-162 (1969).
  7. A. N. Ryabtsev, "The wavelengths of transitions between the low configurations in Ni IX-Ni XII," Sov. Astron. J. 23, 732-734 (1979).
  8. J. Sugar, V. Kaufman, and W. L. Rowan, "Improved wavelengths for prominent lines of Ni X to Ni XXIV," J. Opt. Soc. Am. B 9, 344-346 (1992).
    [CrossRef]
  9. R. D. Cowan, The Theory of Atomic Structures and Spectra (U. California Press, Berkeley, Calif., 1981).
  10. V. I. Azarov, "Formal approach for the solution of complex spectra identification problem," Phys. Scr. 48, 656-662 (1993).
    [CrossRef]

1993 (1)

V. I. Azarov, "Formal approach for the solution of complex spectra identification problem," Phys. Scr. 48, 656-662 (1993).
[CrossRef]

1992 (1)

1990 (1)

G. J. van het Hof, J. O. Ekberg, and A. I. Nilssen, "Extension of the analysis of Ni IX," Phys. Scr. 41, 252-256 (1990).
[CrossRef]

1989 (1)

G. J. van het Hof, A. J. J. Raassen, P. H. M. Uylings, L. I. Podobedova, and A. N. Ryabtsev, "Extension of the analysis of the 3d4-3d³4p transition array in Ni VII," Phys. Scr. 39, 458-467 (1989).
[CrossRef]

1988 (1)

A. V. Loginov and A. N. Ryabtsev, "Spectrum of Ni VIII," Sov. Opt. Spectrosc. 65, 1362-1366 (1988).

1980 (2)

A. J. J. Raassen, "Analysis of the sixth spectrum of nickel (Ni VI)," Physica C 100, 404-424 (1980).
[CrossRef]

A. A. Ramonas and A. N. Ryabtsev, "The spectra of Mn VII-Cu XI ions of the K I isoelectronic sequence," Sov. Opt. Spectrosc. 48, 348-355 (1980).

1979 (1)

A. N. Ryabtsev, "The wavelengths of transitions between the low configurations in Ni IX-Ni XII," Sov. Astron. J. 23, 732-734 (1979).

1969 (1)

L. A. Svensson and J. O. Ekberg, "The titanium vacuum spark spectrum," Ark. Fys. 40, 145-162 (1969).

Azarov, V. I.

V. I. Azarov, "Formal approach for the solution of complex spectra identification problem," Phys. Scr. 48, 656-662 (1993).
[CrossRef]

Ekberg, J. O.

G. J. van het Hof, J. O. Ekberg, and A. I. Nilssen, "Extension of the analysis of Ni IX," Phys. Scr. 41, 252-256 (1990).
[CrossRef]

L. A. Svensson and J. O. Ekberg, "The titanium vacuum spark spectrum," Ark. Fys. 40, 145-162 (1969).

Kaufman, V.

Loginov , A. V.

A. V. Loginov and A. N. Ryabtsev, "Spectrum of Ni VIII," Sov. Opt. Spectrosc. 65, 1362-1366 (1988).

Nilssen, A. I.

G. J. van het Hof, J. O. Ekberg, and A. I. Nilssen, "Extension of the analysis of Ni IX," Phys. Scr. 41, 252-256 (1990).
[CrossRef]

Podobedova, L. I.

G. J. van het Hof, A. J. J. Raassen, P. H. M. Uylings, L. I. Podobedova, and A. N. Ryabtsev, "Extension of the analysis of the 3d4-3d³4p transition array in Ni VII," Phys. Scr. 39, 458-467 (1989).
[CrossRef]

Raassen, A. J. J.

G. J. van het Hof, A. J. J. Raassen, P. H. M. Uylings, L. I. Podobedova, and A. N. Ryabtsev, "Extension of the analysis of the 3d4-3d³4p transition array in Ni VII," Phys. Scr. 39, 458-467 (1989).
[CrossRef]

A. J. J. Raassen, "Analysis of the sixth spectrum of nickel (Ni VI)," Physica C 100, 404-424 (1980).
[CrossRef]

Ramonas , A. A.

A. A. Ramonas and A. N. Ryabtsev, "The spectra of Mn VII-Cu XI ions of the K I isoelectronic sequence," Sov. Opt. Spectrosc. 48, 348-355 (1980).

Rowan, W. L.

Ryabtsev, A. N.

G. J. van het Hof, A. J. J. Raassen, P. H. M. Uylings, L. I. Podobedova, and A. N. Ryabtsev, "Extension of the analysis of the 3d4-3d³4p transition array in Ni VII," Phys. Scr. 39, 458-467 (1989).
[CrossRef]

A. V. Loginov and A. N. Ryabtsev, "Spectrum of Ni VIII," Sov. Opt. Spectrosc. 65, 1362-1366 (1988).

A. A. Ramonas and A. N. Ryabtsev, "The spectra of Mn VII-Cu XI ions of the K I isoelectronic sequence," Sov. Opt. Spectrosc. 48, 348-355 (1980).

A. N. Ryabtsev, "The wavelengths of transitions between the low configurations in Ni IX-Ni XII," Sov. Astron. J. 23, 732-734 (1979).

Sugar, J.

Svensson , L. A.

L. A. Svensson and J. O. Ekberg, "The titanium vacuum spark spectrum," Ark. Fys. 40, 145-162 (1969).

Uylings, P. H. M.

G. J. van het Hof, A. J. J. Raassen, P. H. M. Uylings, L. I. Podobedova, and A. N. Ryabtsev, "Extension of the analysis of the 3d4-3d³4p transition array in Ni VII," Phys. Scr. 39, 458-467 (1989).
[CrossRef]

van het Hof, G. J.

G. J. van het Hof, J. O. Ekberg, and A. I. Nilssen, "Extension of the analysis of Ni IX," Phys. Scr. 41, 252-256 (1990).
[CrossRef]

G. J. van het Hof, A. J. J. Raassen, P. H. M. Uylings, L. I. Podobedova, and A. N. Ryabtsev, "Extension of the analysis of the 3d4-3d³4p transition array in Ni VII," Phys. Scr. 39, 458-467 (1989).
[CrossRef]

Ark. Fys. (1)

L. A. Svensson and J. O. Ekberg, "The titanium vacuum spark spectrum," Ark. Fys. 40, 145-162 (1969).

J. Opt. Soc. Am. B (1)

Phys. Scr. (3)

G. J. van het Hof, A. J. J. Raassen, P. H. M. Uylings, L. I. Podobedova, and A. N. Ryabtsev, "Extension of the analysis of the 3d4-3d³4p transition array in Ni VII," Phys. Scr. 39, 458-467 (1989).
[CrossRef]

G. J. van het Hof, J. O. Ekberg, and A. I. Nilssen, "Extension of the analysis of Ni IX," Phys. Scr. 41, 252-256 (1990).
[CrossRef]

V. I. Azarov, "Formal approach for the solution of complex spectra identification problem," Phys. Scr. 48, 656-662 (1993).
[CrossRef]

Physica C (1)

A. J. J. Raassen, "Analysis of the sixth spectrum of nickel (Ni VI)," Physica C 100, 404-424 (1980).
[CrossRef]

Sov. Astron. J. (1)

A. N. Ryabtsev, "The wavelengths of transitions between the low configurations in Ni IX-Ni XII," Sov. Astron. J. 23, 732-734 (1979).

Sov. Opt. Spectrosc. (2)

A. V. Loginov and A. N. Ryabtsev, "Spectrum of Ni VIII," Sov. Opt. Spectrosc. 65, 1362-1366 (1988).

A. A. Ramonas and A. N. Ryabtsev, "The spectra of Mn VII-Cu XI ions of the K I isoelectronic sequence," Sov. Opt. Spectrosc. 48, 348-355 (1980).

Other (1)

R. D. Cowan, The Theory of Atomic Structures and Spectra (U. California Press, Berkeley, Calif., 1981).

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Figures (2)

Fig. 1
Fig. 1

Reduced average energies (EHF/Z) of the lowest odd configurations in the Ni vi–Ni x isonuclear sequence. EHF, Hartree–Fock average energy; Z=Zc+1, spectroscopic number. Configuration designations: nl=3dk-1nl, pd=3p53dk+1, and sp=3dk-24s4p, where k=51 in the Ni vi–Ni x, respectively.

Fig. 2
Fig. 2

(a) Nickel spectrum of the sliding spark and (b) the calculated spectrum of 3d43d34f transitions in Ni vii in the 132–152-Å wavelength region. The strong lines above 145 Å probably belong to the unknown 3p63dn3p53dn+1 transitions in the ionization stages lower than Ni vii.

Tables (3)

Tables Icon

Table 1 Classified Lines of the 3d43d34f Transitions in Ni vii

Tables Icon

Table 2 Measured (Eexp) and the Fitted (Efit) Energies of 3d34f Levels in Ni viia

Tables Icon

Table 3 Least-Squares-Fitted and Hartree–Fock Energy Parameters and Their Ratios in the Ni vii

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