Very fast relaxation in polycarbonate glass

Details Very fast relaxation in polycarbonate glass Very fast relaxation in polycarbonate glass

2000-09-15

arxiv.org/abs/cond-mat/0009234v1

European Phys. J. B 17(4), 661-666, 2000

Physics

Condensed Matter

Disordered Systems and Neural Networks

15 pages, 6 figures, to be pub. in EPJB

Scientific paper

10.1007/s100510070105

Low-frequency Raman and inelastic neutron scattering of amorphous bis-phenol A polycarbonate is measured at low temperature, and compared. The vibrational density of states and light-vibration coupling coefficient are determined. The frequency dependences of these parameters are explained by propagating vibration modes up to an energy of about 1 meV, and fracton-like modes in more cohesive domains at higher energies. The vibrational dynamics is in agreement with a disorder in the glass, which is principally of bonding or of elasticity instead of density.

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