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Figure 8
(a) Normalized evolution of immobile protons on the nanosecond timescale obtained from data collected using IRIS at ISIS. The error bars are within the size of the symbols. (b) Normalized vibrational spectra obtained at 10 K using the vibrational spectrometer TOSCA. VH samples are shown in black, SH samples in red and BSH samples in green. In (a) the intensity of the signal is directly proportional to the phonon density. In (b) the anomalous decrease of the elastic intensity, indicated by an arrow and occurring around 80 K, is indicative of the onset of some type of diffusive motion that is faster than the instrumental time resolution (40 ps). Blue dotted circles indicate vibrational modes attributed to S–H torsion (∼150 cm−1) and S–H bending (∼950 cm−1) in L-cysteine (Bordallo et al., 2010BB7; Pawlukojc et al., 2005BB70).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 56| Part 4| August 2023| Pages 1002-1014
https://doi.org/10.1107/S1600576723005599
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