RYDMR OF SHORT-LIVED SPIN-CORRELATED PAIRS

An acronym RYDMR (reaction-yield-detected magnetic resonance) proposed by E. Frankevich (1) is now used to denote methods for recording the EPR spectra of short-lived spin-correlated pairs of paramagnetic particles based on the influence of resonant microwave (mw) radiation on the yield of the reaction products of these pairs. Spin-correlated pairs arise from a precursor of a given spin multiplicity (e.g. from a singlet or triplet excited molecule) and acquire this multiplicity upon formation. In the RYDMR method a concept “reaction yield” is used in a general sense to denote any change in the system due to pair reaction. This can be the yield of final or intermediate reaction products, the intensity of excited product luminescence, the electrical conductivity of a sample, the nuclear polarization of reaction product, etc…