Abstract
The glass transition of cryoprotective solutions on cooling is the key for successful cryopreservation of biological substances. We examine ethylene glycol solutions by using ultra-broadband spectroscopy. The dynamical properties from gigahertz to terahertz frequency range are investigated by using Raman scattering, Brillouin scattering and terahertz time domain spectroscopy (THz-TDS). In this frequency range the relaxation modes and vibrational modes coexist, hence it can be a powerful tool to provide important the information on dynamics of glass forming liquids. We investigate the slow and fast dynamics from the complex dielectric and Raman spectra of these solutions, and the non-coincidence effect between imaginary parts of dielectric and Raman susceptibility are discussed.
