Probing dielectric relaxation properties of liquid CS2 with terahertz time-domain spectroscopy

Abstract

Terahertz time-domain spectroscopy is used to investigate the dielectric relaxation properties of liquid CS2. The frequency-dependent absorption coefficient and index of refraction were measured in the frequency range 0.2–2.0 THz. The ultrafast dielectric relaxation time of liquid CS2 was determined to be 630±30 fs by fitting the dielectric function to the Debye model which is attributed to average time for rocking and rotational response of the CS2 molecules possessing an anisotropic polarizability.