Low frequency Raman scattering from aqueous sucrose solution

• Published in: Journal of non-crystalline solids 2001-12, Vol.296 (1), p.115-122
• Main Authors: Paranjpe, A.S., Deb, S.K.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Infrared and raman spectra and scattering; Lattice dynamics; Liquids; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Physics; Vibrational states in disordered systems
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/S0022-3093(01)00899-7

Low frequency Raman spectra of aqueous sucrose solution with percent sucrose concentration c=85 have been recorded as a function of temperature in the 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 frequency ω m is found to decrease with increasing temperature from ∼46 cm −1 at 200 K to ∼28 cm −1 at 353 K. Spectral intensity and relaxation time change discontinuously at T 1=313 K. No discontinuity is observed near the bulk transition temperature T g=265 K measured by differential scanning calorimetry (DSC). Renormalised boson peak frequency ω 0 approaches zero at T 2 ∼363 K which, according to the GMNS model, is the temperature at which vibrational modes soften. There appears to be another inelastic peak around 12 cm −1 . Presence of two inelastic peaks has not been observed before.