The onset of opalescence cannot be determined precisely. It is therefore not certain that a measurement is performed directly at the critical point. Light scattering responds much more sensitively, showing a dramatic increase in scattering rate. The measured values are consequently fitted freely to the scaling function in the sense of Eq. (3.44) or Eq. (3.42). The result is shown in Fig. 5.21.

Figure 5.21. Bhattacharjee–Ferrell scaling function with constant Ω_1/2 = 2.1, Eq. (3.44).

3. Examination of the characteristic relaxation rate Γ_BF^US

Critical behavior is examined by considering the individual relaxation times (Fig. 5.22). The fitted expression follows from Eq. (3.35):