Abstract
The absorption spectrum of trivalent chromium in magnesium spinel has been studied at room and low temperature in the region 14,000 to 35,000 cm −1. Assignments are given for the observed transitions which are compared with their counterparts in the ruby spectrum. Analysis of the splitting of the 4 T 1 g ( F) ← 4 A 2 g transition under the trigonal component of the crystal field gives a value of −1060 cm −1 for K, the trigonal field parameter. The overall crystal field splitting Δ, is 18,520 cm −1.
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