Observation of electronic Raman transitions from the transition metal ions Ti 3+ and V 4+ highly diluted in α-Al 2O 3

Abstract

α-Al 2O 3 : Ti 3+ (300 mass ppm concentration) at 10 K shows two electronic Raman transitions at 38 cm -1 and 109 cm -1. The E symmetry of the scattering matrix agrees with the selection rules for transitions between the ground state B 3 2 and the E 1 2 of the ground state manifold 2 t 2 g .α-Al 2o 3 : V 4+ shows two very weak electronic Raman transitions at about 30 cm -1 and 56 cm -1 respectively.