Figure 1. Self intermediate scattering function (SISF) of water in Lyz-Tr(aq) and bulk water.

The SISF of the oxygen atoms of water F_S(q_max,t), with q_max = 2.25 Å⁻¹ at peak of the oxygen–oxygen structure factor, is shown for water in the lysozyme–trehalose mixture, “Lyz-Tr(aq)” (red squares) and for bulk water, “Bulk” (black circles) at (a) T = 300 K, (b) T = 280 K and (c) T = 260 K. Black lines are fits to Eq. 1, red lines are fits to Eq. 2. The tails of the correlation function F_S(q_max, t) found for water in the Lyz-Tr(aq) indicate the presence of an additional slower relaxation time with respect to Bulk. Insets: for temperatures T = 300 K, 280 K and 260 K, (top) the fits to Eq. 1 show the change of the F_S(q_max, t) with temperature for Bulk (black lines); (bottom) the fits to Eq. 2 show the change of F_S(q_max,t) with temperature for water in the Lyz-Tr(aq) (red lines).