Energy levels and intensities of the absorption spectrum of the U 3+ ion in anhydrous formic acid

Abstract

The absorption spectrum of the U 3+ ion in anhydrous formic acid was recorded in the range 4100–23,000 cm −1. The electrostatic, spin-orbit and configuration interaction parameters obtained from a least-squares fit to eight observed levels are: E 1 = 2882.7 cm −1, E 2 = 13.8 cm −1, E 3 = 285.4 cm −1, ξ 5 f = 1654 cm −1, α = 19.8 cm −1, β = −380.3 cm −1 and γ = 1000.0 cm −1. Intensity calculations gave good agreement with the oscillator strengths of observed bands only if some of the experimental band areas were combined.