The magnetic hysteresis of the mixed-valence manganese cluster, Mn 12 O 12 (OOCMe) 16 (H 2 O) 4 , (Mn 12 ),1 a molecular superparamagnet,2 can be optically detected in a dilute, frozen organic glass below the blocking temperature of 3.8 K by magnetic circular dichroism spectroscopy.
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Cheesman et al. (1997) studied this question.
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