A 4.5 GPa shock pulse producing a cycle of compression heating (<25ps) and expansion cooling (~1.5ns) is used to study fast mechanical dynamics of solid organic polymers and proteins. Coherent Raman spectroscopy of a dye in the sample shows that compression occurs by an instantaneous part followed by a second, ~300ps, structural relaxation process. After expansion, a mechanically distorted structure is produced which does not relax on the <15ns time scale. The results are interpreted with an energy landscape model.
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Kim et al. (1999) studied this question.
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