Abstract
The terahertz spectroscopy is a powerful tool for the study of molecular motions at the terahertz region which links the dielectric relaxation and oscillatory, intermolecular motions. Terahertz spectroscopy provides an efficient method to obtain the frequency dependent optical parameters in a previously difficult region to investigate. To understand the terahertz dynamics of well known glass former, ethylene glycol, the terahertz time domain spectroscopy (THz-TDS) was applied to ethylene glycol aqueous solutions. The frequency dependent optical parameters, refractive indices, absorption coefficient and the complex permittivity in the terahertz region were measured with femtosecond terahertz pulse transmission spectroscopy. The use of various lengths of samples achieved good spectral resolution even in samples of low absorption.
