DIELECTRIC-RELAXATION IN SUPERCOOLED 1-PROPANOL

By combining time- and frequency-domain techniques, the dielectric res ponse of l-propanol has been measured in a spectral range covering ele ven decades. In particular it has been demonstrated that the dielectri c loss due to the main relaxation in 1-propanol exhibits the Debye wid th up to timescales of 1000 s. In order to extend the range in which t he dynamics of propanol can be exploited to high temperatures, conduct ivity relaxation due to ionic impurities has been used. The occurrence of high-frequency relaxation processes has been studied in both isome rs of propanol. It is shown that the 1-propanol data yield a master cu rve in a previously suggested scaling representation. However, owing t o the presence of the high-frequency excitations, no agreement with th e universal scaling form is obtained.