Absorption spectra of liquid water and aqueous buffers between 0.3 and $3.72THz$

We have developed a terahertz absorption spectrometer suitable for strongly absorbing liquids such as water, and have precisely measured the absorption spectrum of water between 0.3 and $3.72THz$ $(10–124cm−1)$⁠. We have also examined the absorption spectra of aqueous $50mM$ potassium phosphate buffers at $pH$ 3 and 8, and find that they do not differ significantly from pure distilled de-ionized water.