Terahertz spectroscopy, spanning the range from 0-20 THz, or equivalently, 0-660 cm-1, has been widely and very successfully used in the study of charge carrier dynamics in semiconductors[1]. There have been decidedly fewer successful studies reporting molecular spectroscopy in this interesting fingerprint region, where optical phonons and low-frequency vibrational modes are active. At room temperature, substantial thermal excitation of these low-frequency modes typically occurs, determining the structural dynamics in a variety of systems.<br/>Here, I describe our recently developed new types of ultrafast terahertz spectroscopies to obtain important insights in both phonon dynamics in solid-state materials [2] and coupling between high-frequency modes and low-frequency modes in water [3] and other systems.

Novel ultrafast terahertz spectroscopies

256th National Meeting (2018)

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