Abstract

We have used both Hartree-Fock functions and the pseudorelativistic HX functions of Cowan to examine the relationship between observed isotope shifts and s-electron densities at the nucleus for Cm, Am, Pu, and U. There are significant changes in relative electron densities when the relativistic correction is included which greatly improve the correlation between observed isotope shifts and electron density. The improvement is especially dramatic for those configurations which fit most poorly with HF values of |ψ(0)|². The slope $[S=\mathrm{\Delta }IS/\mathrm{\Delta }(4\pi {|\psi (0)|}_{\text{tot}}^2)]$ per unit effective mass difference is found to be nearly constant for the actinides considered. This allows prediction of isotope shifts for ²⁵²Cf-²⁵⁰Cf which have not been measured. Isotope shifts are also predicted for Cm, Am, Pu, and U configurations which have not yet been identified.

© 1977 Optical Society of America

Term analysis of the spectrum of neutral neptunium (Np i)*

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Multiconfiguration Hartree-Fock study of the interaction between sp⁶ and s²p⁴d in the CI i, Br i, and I i isoelectronic sequences with particular emphasis on the neutral halogens

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Isotope Shift in the Spectrum of Mercury Hydride*

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Energies of the Electronic Configurations of the Lanthanide and Actinide Neutral Atoms

Leo Brewer
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J. Rand McNally
J. Opt. Soc. Am. 39(4) 271-274 (1949)