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Far-infrared and electron paramagnetic resonance spectroscopy on c&NiSO46H20 have confirmed the zero-field splitting predicted by Fisher and Hornung. However, instead of a single sharp pair of levels at 474 cm we find a band which is 1 cm' wide and centred near this value. The farinfrared spectrum shows some unresolved structure but it has a sharp edge characteristic of exciton selection rules. Both the molecular field parameter and the far-infrared spectra indicate that the interaction between the Ni(H2O) is mainly ferromagnetic exchange.

Electron exchange for hydrated ions in the α-NiSO4 6H2O lattice