Electron spin locking, rotary echoes, and rotary echo trains have been detected for molecules in their excited triplet states by monitoring the microwave-induced modulation of the phosphorescence. The preliminary results of these studies suggest that nuclear and electron spins in ground and excited states, acoustic phenomena in molecular solids, energy transfer, spin-exchange, nuclear polarization, and a wide variety of additional processes can be optically detected, measuring as few as 10⁴ spins.
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Harris et al. (1973) studied this question.
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