Approach to glassy behavior of dielectric relaxation in 3-bromopentane from 298 to 107 K

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Abstract
Relaxation times determined by time domain reflection (TDR), bridge and transient measurements range from 12 ps at 298 K to 590 s at 107 K. Arrhenius temperature dependence with activation energy of 2.75 kcal and Debye relaxation function begin to change to the Fulcher–Vogel rate law and Cole–Davidson (skewed arc) form of relaxation well above the melting point. Methods used to establish that the Williams–Watts (stretched exponential) relaxation function gives a less satisfactory representation are described, as are methods for correcting systematic high frequency errors in TRD measurements, and implications for theory of the results are briefly discussed.