An Analysis of the Infrared Absorption Spectrum of Am+3(5f6) in LaCl3

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Abstract
The polarized infrared absorption spectrum of single crystals of Am+3(5f6) in LaCl3 has been studied from 0.79 to 16.0 μ. In almost every instance the spectrum is sharp and completely polarized, and appears in definite groupings. Transitions from the ground level, 7F0, to excited levels of the ground term, 7F1, 7F2, 7F3, 7F4, 7F5, and 7F6 have been observed. For the particular point symmetry C3h that is consistent with experiment, magnetic‐dipole transitions are observed from the 7F0 level to the 7F1 level, and forced electric‐dipole transitions are observed to levels J = 2, 3, 4, 5, and 6. A theoretical analysis is presented for the crystal‐field split 7FJ levels. Using four parameters—A20〈r2〉=206 cm—1, A40〈r4〉=—94.1 cm—1, A60〈r6〉=—93.8 cm—1, and A66〈r6〉=1100 cm—1—excellent agreement is obtained between theory and experiment.

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