Low-frequency vibrational excitations in the amorphous and crystalline states of triphenyl phosphite:: A neutron and Raman scattering investigation -: art. no. 144202

The vibrational density of states in the triphenyl phosphite, measured by inelastic neutron scattering, were obtained during isothermal aging at T-a=210, 213, and 216 K. The low-frequency omega (n) behavior of the vibrational density of states was observed to be time dependent. This is suggestive of an abortive crystallization process because the omega exponent has not reached the characteristic value of the crystalline state (n=2) at the end of the transformation. The confrontation of inelastic neutron scattering and Raman data in the low-frequency range reveals interesting information about the structural organization in the liquid, the glass, the undercooled liquid, and the glacial state, through the observation of the boson peak.