Low Frequency Raman Scattering in Amorphous Polymers
Raman frequencies below 200 wavenumbers studied at temperatures
down to liquid Nitrogen, reveal the presence of broad phonon mode
bands that allow for the estimation of the specific heat of the material at
very low temperatures.
A universal character in these phonon modes is thus observed
which is further mathematically treated by an appropriate model.
The phonon modes are shown to be related to the extent of structural
ordering within the amorphous material, regardless of whether it is a
polymer or an inorganic glass.