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The specific susceptibilities of a series of manganese-activated zinc fluoride phosphors and their components have been measured. The unexcited manganese was found to be in the divalent 6S state. There is evidence for exchange demagnetization of adjacent paramagnetic activator ions. The change in paramagnetic susceptibility with excitation, predicted by Williams and Eyring F. E. Williams and H. Eyring, J. Chem. Phys. 15, 289 (1947) to explain the long non-temperature-dependent lifetimes of the emitting states of luminescent solids containing paramagnetic activators, has been measured for manganese-activated zinc fluoride. Radiation from a high voltage discharge lamp was used to excite the phosphor in a vacuum magnetic balance having a sensitivity of 10−6 dyne per mm scale deflection. The observed change in susceptibility corresponds to a decrease of the order of magnitude of one Bohr magneton per excited activator ion.
Johnson et al. (Sun,) studied this question.