With the ongoing proliferation of terahertz time-domain instrumentation from
semiconductor physics into applied spectroscopy over the past decade, measurements
at terahertz frequencies (1 THz ≡ 1012 Hz ≡ 33 cm−1) have
attracted a sustained growing interest, in particular the investigation of
hydrogen-bonding interactions in organic materials. More recently, the availability
of Raman spectrometers that are readily able to measure in the equivalent spectral
region very close to the elastic scattering background has also grown significantly.
This development has led to renewed efforts in performing spectroscopy at the
interface between dielectric relaxation phenomena and vibrational spectroscopy. In
this review, we briefly outline the underlying technology, the physical phenomena
governing the light-matter interaction at terahertz frequencies, recent examples of
spectroscopic studies, and the current state of the art in assigning spectral
features to vibrational modes based on computational techniques.
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