Abstract
The paramagnetic absorption in manganous ammonium sulphate hexahydrate has been investigated at 195°K and 90°K in a wide interval of frequencies, permitting the separation of lattice absorption and spin absorption. At medium frequencies a small extra absorption was detected in high constant parallel fields, the nature of which is unknown. The relaxation time of lattice absorption varies with the constant field in agreement with Van Vleck's theory. The relaxation time of spin absorption is twice the value expected by Bioer and unexpectedly proves itself to be very little dependent on a parallel constant field.
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