Abstract
An experimental investigation was made of the optical absorption spectra corresponding to transitions in the Pr3+ ion in crystalline LaF3 and Y2SiO5 matrices. The investigation was carried out in the temperature range 5 — 80 K. An anomalous redistribution of the intensity was observed in the absorption spectrum of a Pr3+ :LaF3 crystal. This redistribution did not agree with the hypothesis of the Boltzmann population of the states in discrete multilevel systems.
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