Abstract
Abstract The temperature dependence of lineshapes of EPR signals of AsO4 4 center has been utilized as a probe of the slow dynamics of (NH4H2PO4)x-(RbH2PO4)1–x proton glass system over the whole composition range x. The EPR signals exhibit anomalous line-broadening as a function of x as well as temperature. A theoretical procedure was developed based on the formalism of modified Bloch equations, that enabled us to evaluate the broadening effect of motional dynamics, and, consequently, lattice strain. A comparison of the experimental and theoretical lineshapes revealed that strain broadening, and not exchange effects, makes a dominant contribution to the broadening of EPR signals in the proton glass.
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