CHOOSING REFERENCE SAMPLES FOR EPR CONCENTRATION MEASUREMENTS .4. SYSTEMS OF S=5 2/

The papers of this series provide tabulated values that characterize t he specific intensity of electron paramagnetic resonance (EPR) signals (signal area per paramagnetic center) for a wide range of paramagneti c species of various classes. These data enable one to choose a refere nce material producing an EPR signal close in specific intensity to th e signal of the species to be quantitated in the unknown or to determi ne a correction factor when the specific intensities of the two signal s are substantially different. The tabulated values comprise transitio n probabilities and the derivatives of the resonance fields with respe ct to frequency obtained by exact diagonalization of spin Hamiltonian matrices; they can be used in field-swept X-band EPR quantitations of solids. This part covers the S=5/2 paramagnetic centers in cubic and s ome axial crystal fields.