  We present measurements of the dielectric response of quasi one-dimensional
(TMTTF)2AsF6 in a wide temperature and frequency range. We provide a thorough
characterization of the relaxational dynamics observed close to the
ferroelectric-like transition at Tc = 100 K. Our measurements, extending up to
100 MHz, reveal a continuous slowing down of the mean relaxation time when
approaching Tc from high as well as from low temperatures. The simultaneous
critical rise of dielectric constant and relaxation time point to an
explanation of the transition in terms of a classic ferroelectric scenario.
