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The Isomer Shift in 151Eu

  • E. A. Samuel
  • W. N. Delgass

Abstract

Molecular orbital calculations in the Löwdin formalism for five compounds, EuO, Eu2O3, Eu3O4, EuF2 and EuF3, give a value of 3.2 ± 0.7 × 10−4 for the isomer shift calibration constant of 151Eu. The M.O. calculations are also used to predict the variation of the isomer shift with coordination number and bond distance in the Eu3+ − O2−, Eu2+ − O2−, Eu3+ − F and Eu2+ − F systems, and to give the values −18.7 and −8.3 mm/sec for the isomer shift of a free Eu2+ ion and a free Eu3+ ion with respect to Eu2O3. The relativistic enhancement of the free-ion non-relativistic electron density at an Eu nucleus is discussed and the variation of free-ion isomer shifts with electron configuration presented.

Keywords

Isomer Shift Radial Dependence Calibration Constant Electron Density Difference Nuclear Volume 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1976

Authors and Affiliations

  • E. A. Samuel
    • 1
  • W. N. Delgass
    • 2
  1. 1.Center for Surface and Coatings ResearchLehigh UniversityBethlehemUSA
  2. 2.School of Chemical EngineeringPurdue UniversityWest LafayetteUSA

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