Electron Resonance Powder Spectra for Systems with S > 12

A qualitative interpretation, ignoring nuclear hyperfine effects, of the line shapes and positions of all the lines occurring in the ESR powder spectra for S = 32, 52 systems with rhombic environments is presented. The formulation of the problem assumes the zero-field tensor is dominant in determining the angular dependence of oriented crystal spectra. In favorable cases, g factors and zero-field splitting parameters can be determined, and results from powder spectra are compared with spin-Hamiltonian parameters obtained from a single crystal study of Cr3+: (NH4)2[In(H2O)Cl5].