Abstract
Experiments on paramagnetic resonance absorption have been carried out on single-crystals of iron ammonium alum with different degrees of magnetic dilution. It is found that absorptions with | Δm | > 1 occur and that these have to be ascribed to the influence of crystalline electric fields. Agreement with theory is found on the behaviour of the absorption as a function of the angle between external also high frequency oscillating field. A sharp absorption peak at 1 3 of the central peak field strength is found and an interpretation is given. The discrepancy between the assumption of a cubic crystalline field, the known specific heats of the spin system and the paramagnetic resonance results is discussed.
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