Time-domain terahertz (THz) spectroscopy

A comprehensive review of world-wide efforts in THz spectroscopy on semiconductor systems which includes reports of our own work, can be found in the recently published review paper:
Carrier dynamics in semiconductors studied with time-resolved terahertz spectroscopy
Ronald Ulbricht, Euan Hendry, Jie Shan, Tony F. Heinz, & Mischa Bonn
Reviews of Modern Physics 83 (2011) 543.  DOI: 10.1103/RevModPhys.83.543   

We further use THz spectroscopy to study the dynamics of molecules in aqueous solutions, combined with a combination of other spectroscopic techniques such as ultrafast infrared (fs-IR) and dielectric spectroscopies (FD-GHz). These techniques allow us to trace the motion of water molecules in real-time. We have for example used this approach to shed new light on the structure and dynamics of water around different types of ions, i.e. ion hydration.

Cooperativity in ion hydration
K.J. Tielrooij, N. Garcia, M. Bonn & H.J. Bakker
Science 328 (2010) 1006. DOI: 10.1126/science.1183512