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Inelastic coherent neutron spectra from deuterated polybutadiene in the neighborhood of the glass transition allows one to discriminate long wavelength and other excitations. The analysis reveals the unexpected result that a dominating part of the so-called fast process in polybutadiene, commonly attributed to picosecond relaxations, rather originates from a strong softening of the sound waves.
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Buchenau et al. (1996) studied this question.
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