title: Dynamic scaling and slowing down in chemical reactions of the critical triethylamine-water system.
abstract: Between 100 kHz and 1 MHz, special ultrasonic attenuation measurements of the triethylamine-water mixture of critical composition have been performed for the determination of the Bhattacharjee-Ferrell scaling function. The experimental data are evaluated considering two noncritical Debye-type relaxation terms as revealed by broadband ultrasonic spectra. Shear viscosity and dynamic light scattering data from the literature are re-evaluated to yield the relaxation rate of order parameter fluctuations of the critical system as a function of temperature. The power law behavior found for the relaxtion rate fits to the scaling function in the ultrasonic spectra. The relaxation times of the noncritical Debye terms display a non-Arrhenius temperature dependence, pointing at effects of slowing in the chemical reactions associated with the relaxations.
authors.affiliation: Drittes Physikalisches Institut, Georg-August-Universitt, Friedrich-Hund-Platz 1, 37077 Goettingen, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Iwanowski
authors.forename: U
authors.initials: U
authors.lastname: Kaatze