Abstract
Time domain measurements of solutions at seven compositions and 25°C have been Fourier transformed to obtain complex permittivities in the range 50 MHz to 8 GHz. These can be represented by a sum of two Debye relaxation functions. The principal, slower, one has a relaxation time changing smoothly from 320 ps for 1-propanol to 8 ps for water (by extrapolation from 0.75 mole fraction of water). The second is quite small for 1-propanol, but increases with added water, and remarkably has a relaxation time of ca. 20 ps which is independent of concentration to within the accuracy of the data and fitting. The significance of the behavior is discussed in terms of diffusion like models for molecular reorientations and local conformational changes in hydrogen bonding, with the conclusion that the latter provides a more likely explanation, particularly of the faster relaxation.
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