Abstract
NMR techniques have been used to characterize the transitions with temperature of a very thin film of a copolymer FEP wich had covered the walls of a maser cavity. Several points on the frequency-temperature chart have been obtained from a study of the temperature variation of the second moment and of the relaxation times T1 and T1ϱ. They confirm that the transitions observed in the temperature dependence of the factors which control the maser stability are associated to very low frequency molecular motions.
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