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. 2015 Mar 10;5:8972. doi: 10.1038/srep08972

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An increased amount of larger amplitude motions was detected at 205 K (−68°C) for the Aqua (a) and at 200 K (−75°C) for the Poly (b) at the ns time-scale. Furthermore, the observable drop in intensity at the lowest value of Q suggests differences in the diffusivity of the liquid in both materials. For the 23 day-old samples, while no changes in the temperature of the activated motions could be detected for the Poly (d), a significant reduction of the amount of mobile protons for the Aqua (c) is noticed, implying that important changes occurred in the Aqua structure. At the ps time-scale, a similar degree of proton mobility was observed for both materials after 23 days (e, f).