Survey of ESR Results

The majority of ESR studies on the dl configuration have been done on the Ti(III) and V(IV) ions with a lesser number of studies done on systems 

For both octahedral and tetrahedral symmetries, there are excited states close to the ground state, causing short spin-lattice-relaxation times and broad absorption lines at most temperatures. Thus the dl ion in an octahedral or tetrahedral field has only been detected at low temperatures (generally liquid He or H2). When the crystal field is highly distorted from these symmetries, as in the case of the V02+ ion, the spin-lattice time becomes longer, making detection of ESR possible at higher temperatures. 

The g values for Ti3+ in A1203 cannot be fitted to Eq. (49). Ray (69) has shown that these g values can be explained by assuming 8 negative. In this case the ground-state wave functions are 

When the Zeeman-perturbation term is applied to these functions, we obtain for the g values 

Using these functions, we can obtain by methods discussed in Sec. Ill the following equations for the spin Hamiltonian parameters  

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In the survey of ESR results, the nomenclature for electron con-hguration used has been, for convenience, to take the unpaired electron to be nominally on the metal. In practice, this means that, e.g., [Ni(MNT)2] has its unpaired electron in the 4a -molecular orbital which... 

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