Quasi-Γ8Ground State of a Jahn-Teller Ion

Abstract
We show that the ground state of Ti3+ in CsAl alum is a quasi-Γ8 state with a very small trigonal splitting. A spin Hamiltonian for this quasi-Γ8 state is derived and used to describe the experimental EPR anisotropy. The near cancelation of the trigonal splitting is due to the presence of a dynamic Jahn-Teller effect.