Is the Fast Process at the Glass Transition Mainly due to Long Wavelength Excitations?

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Abstract
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.