Low frequency Raman scattering from aqueous sucrose solution

Low frequency Raman spectra of aqueous sucrose solution with percent sucros e concentration c = 85 have been recorded as a function of temperature in t he range 200-353 K. The line shape of the spectrum has been analysed using a model by Gochiyaev, Malinovski, Novikov and Sokolov (GMNS). Boson peak fr equency omega (m) is found to decrease with increasing temperature from sim ilar to 46 cm(-1) at 200 K to similar to 28 cm(-1) at 353 K. Spectral inten sity and relaxation time change discontinuously at T-1 = 313 K. No disconti nuity is observed near the bulk transition temperature T-g = 265 K measured by differential scanning calorimetry (DSC). Renormalised boson peak freque ncy omega (0) approaches zero at T-2 similar to 363 K which, according to t he GMNS model, is the temperature at which vibrational modes soften. There appears to be another inelastic peak around 12 cm(-1). Presence of two inel astic peaks has not been observed before. (C) 2001 Elsevier Science B.V. Al l rights reserved.