Abstract
The absorption spectrum of U3+ in LiY F4 has been well calculated using the model proposed by Reid for calculations of spectra. The relevant formulae for the matrix element calculations which wereomitted in this model are now described in detail, and the values of the direct andexchange coefficients associated with the f–d Coulomb interactions within thef2d configuration are derived and listed. The amount of reduction for the f–d Coulombinteraction parameters from the free-ion values is found to be , which is much larger than the value of 26% for the isoelectronicNd3+ lanthanide ion in the same host.
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