CHOOSING REFERENCE SAMPLES FOR EPR CONCENTRATION MEASUREMENTS .3. SYSTEMS OF S=3 2/

The papers of this series provide tabulated values that characterize t he specific intensity of electron paramagnetic resonance (EPR) spectro metric signals (signal area per paramagnetic center) for a wide range of paramagnetic species of various classes. These data enable one to c hoose a reference material producing an EPR signal close in specific i ntensity to the signal of the species to be quantitated in the unknown or to determine a correction factor when the specific intensities of the two signals are substantially different. The tabulated values comp rise transition probabilities and the derivatives of the resonance fie lds with respect to frequency obtained by exact diagonalization of spi n Hamiltonian matrices; they can be used in field-swept X-band EPR qua ntitations of solids, This part covers the S=3/2 paramagnetic centers in cubic, axial, and orthorhombic crystal fields.