Transition Probabilities for the Excited State $d ε^{3} {}^{2}Γ_{3}$ of ${Cr}^{3 +}$

In recent experiments Geschwind has observed transitions between the Zeeman components of the excited metastable state

d ε^{3} {}^{2}Γ_{3}

of trivalent chromium present as a dilute impurity in

{Al}_{2}

O_{3}

. In first order the transitions are forbidden. In third order a number of processes give rise to a transition probability and predict

g_{⊥} = 0.1

, consistent with the experimental observations. The magnetic moment associated with the transition is shown to rotate opposite to the usual sense.

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Transition Probabilities for the Excited Statedε3Γ32ofCr3+