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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 15, Iss. 10 — Oct. 1, 1998
  • pp: 2614–2619

Spectrum of La IX : an interesting example of configuration interaction

R. Gayasov and Y. N. Joshi  »View Author Affiliations


JOSA B, Vol. 15, Issue 10, pp. 2614-2619 (1998)
http://dx.doi.org/10.1364/JOSAB.15.002614


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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

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(300.6170) Spectroscopy : Spectra

Citation
R. Gayasov and Y. N. Joshi, "Spectrum of La IX : an interesting example of configuration interaction," J. Opt. Soc. Am. B 15, 2614-2619 (1998)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-15-10-2614


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References

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

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