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The paramagnetic resonance spectrum of divalent nickel in cubic MgO was investigated. The spectrum is isotropic with one line at g=2. 2270. 002. Eight optical absorption lines at 8600, 13 400, 14 800, 21 550, 24 500, 25 950, 28 300, and 34 500 cm^-1 were detected. These absorption lines are interpreted as transitions between the singlet ground state and all possible Stark levels of the F, P, D, and G levels. Agreement is obtained to within 300 cm^-1 by using crystalline field theory, with parameters Dq=860 cm^-1, E=13000 cm^-1, E₃=10900 cm^-1, E₆=19600 cm^-1, and (the0ex{0ex}spin-orbit0ex{0ex}coupling0ex{0ex}constant) =-245 (the spin-orbit coupling constant) = -245 cm^-1. The significance of the reduced values of the energy levels and the spin-orbit coupling constant is discussed.
W. Löw (Wed,) studied this question.
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