Electric quadrupole interactions in rare-earth ions

A. J. Freeman*, R. E. Watson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Electric quadrupole interactions in rare-earth ions arising from electric field gradients due to valence electrons (q4f) and/or crystal fields external to the ion (qlat) are discussed. The contribution of the Sternheimer antishielding factors to both q4f and qlat are calculated for the Ce3+ ion using the method (based on the unrestricted Hartree-Fock formalism) reported earlier. The ionic antishielding factor (γ) is -73.5, and it is found that the total ionic contribution to the electric field gradient can be comparable in magnitude (and may be opposite in sign) with the valence electron contribution (augmented by the internal antishielding factor). The possible relation of these results to the temperature dependence of measured electric quadrupole interactions is noted.

Original languageEnglish (US)
Pages (from-to)706-709
Number of pages4
JournalPhysical Review
Issue number2
StatePublished - 1963

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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