Energy Levels of Ho3+ in LaCl3

Abstract
A least‐squares fit of the previously assigned J levels of Ho3+ in LaCl3 combined with a crystal‐field calculation for the upper levels has made possible the assignment of many of the levels above 28 000 cm−1 observed by Dieke and Pandey. A final least‐squares fit of 23 J levels, with the inclusion of configuration interaction, gave an rms deviation of 68 cm−1 with the parameter values E 0=20 770, E 1=6682.6, E 2=30.69, E 3=620.1, ζ=2127.1, α=23.5, β=−811.2 cm−1. The crystal‐field parameters resulting from a fit of 81 components of the 5 I 4,5,6,7,8 and 5 F 2,3,4,5 levels are B 2 0=113.6, B 4 0=−33.9, B 6 0=−27.8, and B 6 6=276.7 cm−1. The rms deviation in this case was 2.0 cm−1. These crystal‐field parameters give a satisfactory prediction of the crystal‐field splitting of most of the excited J levels.

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