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Paramagnetic resonance absorption of all the naturally occurring rare earth trivalent ions in the LaCl3 structure have been investigated. The results are summarized in the form of a tabulation of the parameters g∥, g⊥, A, B, P, Δ in the spin-Hamiltonian. Theoretical calculations of crystal field states and eigenvalues as well as of g∥ and g⊥, based on optical measurements, are discussed.
Hutchison et al. (Wed,) studied this question.