Fig. 3.
Temperature dependence of the PBD signals of the four resolved transitions. (A) Temperature dependence of the amplitudes as obtained by an exponential simulation (symbols, experimental data; lines obtained by a fit). The dotted lines show the 1σ error ranges of the fit curves. The bars represent the nonthermal part of the PBD signal (volume change ΔV) that corresponds to the PBD amplitude at -14 °C (T0 = -14 ± 1 °C; SI Text). (B) Arrhenius plots of the rate constants (k = τ-1, left y axis; time constants, τ, on right y axis). The symbols indicate the experimentally determined values; the lines are fit curves used for determination of the respective activation energy shown in Table 2.