Hyperfine structure in the configuration 4f 115d6s 2 of Er I |
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Authors: | H. Brüggemeyer V. Pfeufer U. Nielsen J. -F. Wyart |
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Affiliation: | 1. Institut für Atom- und Molekülphysik, Abteilung Spektroskopie, Universit?t Hannover, Federal Republic of Germany 2. Institute of Physics, University of Aarhus, Aarhus, Denmark 3. Laboratoire Aimé Cotton, CNRS II, Orsay, France
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Abstract: | Hyperfine constants of low lying levels of the configuration 4f 115d6s 2 in Er I have been measured for the only stable odd isotope,167Er, using high resolution laseratomic-beam spectroscopy. Hyperfine parameters were evaluated from the experimental data using the effective tensor operator formalism. For this purpose eigenfunctions have been determined from an analysis of the fine structure energies of Er I as well as from ab initio multiconfiguration Dirac-Fock calculations. With the latter method also ab initio hyperfine constants for the levels investigated were evaluated. A comparison of calculated fine structure energies, Landég J -factors and hyperfine constants with the experimental data allowed a test of the reliability of the fine structure and multiconfiguration Dirac-Fock wavefunctions. Effective nuclear electric quadrupole moments for167Er have been determined from the experimental hyperfine constants using both calculated relativistic electronic radial integrals and hyperfine parameters for the 4f and 5d electrons in the configuration 4f 115d6s 2 in Er I. From a comparison with the nuclear quadrupole moment measured in the mesic atom Sternheimer shielding factors are calculated. Configuration-interaction contributions to the radial integrals 〈r ?3〉 nl 01 of the 4f and 5d electrons have been determined. |
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