Energy splittings of the ${}^{2}T_{2}$ vibronic state ${Ti}^{3 +}$ in methylammonium alum

The two excited doublets of the

{}^{2}T_{2}

vibronic state are found to be at 9.4 ± 0.5 and 28.9 ± 0.5

{cm}^{- 1}

using accurate electron spin-lattice relaxation measurements. The experimental

g

values of the ground-state doublet are

g_{∥} = 1.400 \pm 0.005

and

g_{⊥} = 1.606 \pm 0.005

. The Jahn-Teller energy is 515

{cm}^{- 1}

and the

E_{g}

-mode energy is 371

{cm}^{- 1}

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Energy splittings of theT22vibronic stateTi3+in methylammonium alum