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Finestructure, hyperfine structure and isotope shift of 4f \(\)6s7s in Er I

  • D. Ashkenasi
  • S. Kröger
  • H.-D. Kronfeldt

Abstract:

The isotope shift (IS) and hyperfine structure (hfs) of nine levels (31720 to 38921 cm-1) assigned to the configuration 4f 12 6s7s in neutral erbium have been determined experimentally using Doppler-reduced saturation absorption spectroscopy in a gas discharge. We performed a fine structure analysis in the SL-coupling scheme of the single configuration 4f 12 6s7s, confirming and extending the classification of even parity Er I levels. We discriminated the different hfs contributions of the 4f12 core and the (6s+7s) outer electrons of the shell in a non-relativistic JJ-coupling approach and in the relativistic effective tensor operator formalism in SL-coupling. The relativistic one-electron parameters of the hfs for 167Er were fitted to the experimental data by a least squares fit procedure: [0pt] a 01 4f =-147(3) MHz, [0pt] a 10 6s +a 10 7s =-1840(30) MHz, [0pt] b 02 4f =6560(80) MHz. The level dependencies of the isotope shift were evaluated based on crossed second order (CSO) effects. We obtained the following results for the CSO parameters for the isotope pairs 170-168Er: d 6s7s =-740(30) MHz, z 4f = 0(5) MHz, (g 3,6s (f, 6s)+g 3, 7s (f, 7s))= -24(15) MHz and for 170-166Er: d 6s7s =-1500(50) MHz, z 4f =0(10) MHz, (g 3,6s (f,6s)+g 3,7s (f+7s))=-50(29) MHz. The resulting parameters for the hfs are compared with those known for other configurations of the Er atom and ion.

PACS. 21.10.Ky Electromagnetic moments - 31.30.Gs Hyperfine interactions and isotope effects, Jahn-Teller effect - 32.10.Fn Fine and hyperfine structure 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2000

Authors and Affiliations

  • D. Ashkenasi
    • 1
  • S. Kröger
    • 2
  • H.-D. Kronfeldt
    • 3
  1. 1.Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Rudower Chaussee 6, 12489 Berlin, GermanyDE
  2. 2.Institut für Atomare und Analytische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, GermanyDE
  3. 3.Optisches Institut, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, GermanyDE

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