Effect of J Mixing on the g Values of the Γ7 Ground State of Pu3+ Ion and Am4+ Ion in Cubic Symmetry Sites

Abstract

The $g$ values of the ${\Gamma }_7$ ground state and the energy separations between the ${\Gamma }_7$ ground state and the ${\Gamma }_8$ excited state of ${\mathrm{Pu}}^{3+}$ and ${\mathrm{Am}}^{4+}$ ions in a cubic crystal field have been calculated accounting fully for intermediate-coupling and $J$-mixing effects. The results are compared with the recent experimental values of these ions in alkaline-earth fluorides and thorium dioxides.