Abstract

The spectrum of lanthanum was photographed in the 80–1220-Å region. The 5s5p4f configuration in La ix was established for what is to the authors’ knowledge the first time in the In i isoelectronic sequence. Four levels belonging to the odd-parity system 5s2(5p+4f ) and twenty-seven levels belonging to the even-parity system 5s2(5d+6s+5g)+5s5p2+5s5p4f have been established. Two of the four odd-parity levels and twenty-five of the thirty-two even-parity levels are new. We carried out least-squares-fitting and relativistic Hartree–Fock calculations to show the strong configuration interaction effects in the even-configuration system. Forty-seven lines were classified in La ix, of which thirty-seven are new lines.

© 1998 Optical Society of America

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References

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  1. V. Kaufman and J. Sugar, “In I isoelectronic sequence: wavelengths and energy levels for Xe VI through La IX,” J. Opt. Soc. Am. B 4, 1924 (1987).
    [CrossRef]
  2. A. Tauheed, Y. N. Joshi, and E. H. Pinnington, “The 5s25p 2P–5s5p24P intercombination lines in isoelectronic sequence from Sb III to La IX,” J. Phys. B 25, 561 (1992).
    [CrossRef]
  3. R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Sixth spectrum of lanthanum (La VI): analysis of the 5s5p4, 5s5p5 and 5s25p3 (5d+6s) configurations,” J. Phys. B 30, 873 (1996).
    [CrossRef]
  4. R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Seventh spectrum of lanthanum (La VII),” Phys. Scr. 57, 565 (1998).
    [CrossRef]
  5. R. Gayasov and Y. N. Joshi, “Analysis of the seven times ionized lanthanum (La VIII) spectra,” Phys. Scr. (to be published).
  6. R. L. Kelly and L. J. Palumbo, “Atomic and ionic emission lines below 2000 Å—hydrogen through krypton,” J. Chem. Phys. Ref. Data 16, 1 (1987).
  7. L. A. Svensson and J. O. Ekberg, “The titanium vacuum spectrum from 50–425 Å,” Ark. Fys. 10, 145 (1969).
  8. R. D. Cowan, The Theory of Atomic Structure and Spectra (U. California Press, Berkeley, Calif., 1981), and Cowan computer programs.
  9. V. Kaufman and J. Sugar, “Ag I isoelectronic sequence: wavelengths and energy levels for I VII through La XI,” Phys. Scr. 24, 738 (1981).
    [CrossRef]

1998 (1)

R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Seventh spectrum of lanthanum (La VII),” Phys. Scr. 57, 565 (1998).
[CrossRef]

1996 (1)

R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Sixth spectrum of lanthanum (La VI): analysis of the 5s5p4, 5s5p5 and 5s25p3 (5d+6s) configurations,” J. Phys. B 30, 873 (1996).
[CrossRef]

1992 (1)

A. Tauheed, Y. N. Joshi, and E. H. Pinnington, “The 5s25p 2P–5s5p24P intercombination lines in isoelectronic sequence from Sb III to La IX,” J. Phys. B 25, 561 (1992).
[CrossRef]

1987 (2)

R. L. Kelly and L. J. Palumbo, “Atomic and ionic emission lines below 2000 Å—hydrogen through krypton,” J. Chem. Phys. Ref. Data 16, 1 (1987).

V. Kaufman and J. Sugar, “In I isoelectronic sequence: wavelengths and energy levels for Xe VI through La IX,” J. Opt. Soc. Am. B 4, 1924 (1987).
[CrossRef]

1981 (1)

V. Kaufman and J. Sugar, “Ag I isoelectronic sequence: wavelengths and energy levels for I VII through La XI,” Phys. Scr. 24, 738 (1981).
[CrossRef]

1969 (1)

L. A. Svensson and J. O. Ekberg, “The titanium vacuum spectrum from 50–425 Å,” Ark. Fys. 10, 145 (1969).

Ekberg, J. O.

L. A. Svensson and J. O. Ekberg, “The titanium vacuum spectrum from 50–425 Å,” Ark. Fys. 10, 145 (1969).

Gayasov, R. R.

R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Seventh spectrum of lanthanum (La VII),” Phys. Scr. 57, 565 (1998).
[CrossRef]

R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Sixth spectrum of lanthanum (La VI): analysis of the 5s5p4, 5s5p5 and 5s25p3 (5d+6s) configurations,” J. Phys. B 30, 873 (1996).
[CrossRef]

Joshi, Y. N.

R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Seventh spectrum of lanthanum (La VII),” Phys. Scr. 57, 565 (1998).
[CrossRef]

R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Sixth spectrum of lanthanum (La VI): analysis of the 5s5p4, 5s5p5 and 5s25p3 (5d+6s) configurations,” J. Phys. B 30, 873 (1996).
[CrossRef]

A. Tauheed, Y. N. Joshi, and E. H. Pinnington, “The 5s25p 2P–5s5p24P intercombination lines in isoelectronic sequence from Sb III to La IX,” J. Phys. B 25, 561 (1992).
[CrossRef]

Kaufman, V.

V. Kaufman and J. Sugar, “In I isoelectronic sequence: wavelengths and energy levels for Xe VI through La IX,” J. Opt. Soc. Am. B 4, 1924 (1987).
[CrossRef]

V. Kaufman and J. Sugar, “Ag I isoelectronic sequence: wavelengths and energy levels for I VII through La XI,” Phys. Scr. 24, 738 (1981).
[CrossRef]

Kelly, R. L.

R. L. Kelly and L. J. Palumbo, “Atomic and ionic emission lines below 2000 Å—hydrogen through krypton,” J. Chem. Phys. Ref. Data 16, 1 (1987).

Palumbo, L. J.

R. L. Kelly and L. J. Palumbo, “Atomic and ionic emission lines below 2000 Å—hydrogen through krypton,” J. Chem. Phys. Ref. Data 16, 1 (1987).

Pinnington, E. H.

A. Tauheed, Y. N. Joshi, and E. H. Pinnington, “The 5s25p 2P–5s5p24P intercombination lines in isoelectronic sequence from Sb III to La IX,” J. Phys. B 25, 561 (1992).
[CrossRef]

Sugar, J.

V. Kaufman and J. Sugar, “In I isoelectronic sequence: wavelengths and energy levels for Xe VI through La IX,” J. Opt. Soc. Am. B 4, 1924 (1987).
[CrossRef]

V. Kaufman and J. Sugar, “Ag I isoelectronic sequence: wavelengths and energy levels for I VII through La XI,” Phys. Scr. 24, 738 (1981).
[CrossRef]

Svensson, L. A.

L. A. Svensson and J. O. Ekberg, “The titanium vacuum spectrum from 50–425 Å,” Ark. Fys. 10, 145 (1969).

Tauheed, A.

R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Seventh spectrum of lanthanum (La VII),” Phys. Scr. 57, 565 (1998).
[CrossRef]

R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Sixth spectrum of lanthanum (La VI): analysis of the 5s5p4, 5s5p5 and 5s25p3 (5d+6s) configurations,” J. Phys. B 30, 873 (1996).
[CrossRef]

A. Tauheed, Y. N. Joshi, and E. H. Pinnington, “The 5s25p 2P–5s5p24P intercombination lines in isoelectronic sequence from Sb III to La IX,” J. Phys. B 25, 561 (1992).
[CrossRef]

Ark. Fys. (1)

L. A. Svensson and J. O. Ekberg, “The titanium vacuum spectrum from 50–425 Å,” Ark. Fys. 10, 145 (1969).

J. Chem. Phys. Ref. Data (1)

R. L. Kelly and L. J. Palumbo, “Atomic and ionic emission lines below 2000 Å—hydrogen through krypton,” J. Chem. Phys. Ref. Data 16, 1 (1987).

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

J. Phys. B (2)

A. Tauheed, Y. N. Joshi, and E. H. Pinnington, “The 5s25p 2P–5s5p24P intercombination lines in isoelectronic sequence from Sb III to La IX,” J. Phys. B 25, 561 (1992).
[CrossRef]

R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Sixth spectrum of lanthanum (La VI): analysis of the 5s5p4, 5s5p5 and 5s25p3 (5d+6s) configurations,” J. Phys. B 30, 873 (1996).
[CrossRef]

Phys. Scr. (2)

R. R. Gayasov, Y. N. Joshi, and A. Tauheed, “Seventh spectrum of lanthanum (La VII),” Phys. Scr. 57, 565 (1998).
[CrossRef]

V. Kaufman and J. Sugar, “Ag I isoelectronic sequence: wavelengths and energy levels for I VII through La XI,” Phys. Scr. 24, 738 (1981).
[CrossRef]

Other (2)

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

R. Gayasov and Y. N. Joshi, “Analysis of the seven times ionized lanthanum (La VIII) spectra,” Phys. Scr. (to be published).

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Tables (5)

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Table 1 5s5p2+5s25d Fitting in Two-Configuration Model Space

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Table 2 Energy Levels of La ix

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Table 3 Classified Lines of the La ix Spectrum

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Table 4 LSF Parameters and HFR Parameters for Odd- and Even-Configuration Systems of La ix

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Table 5 Fragmented Portion of the Level Scheme of Levels of the 5p25d+5s25g+5p4f5d+5s5p5f+5s25g and 5p25g Unknown Configuration

Equations (2)

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5s25g 2G7/2=593 859cm-1,
2G9/2=594 699cm-1,Δ2G=840cm-1.

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