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

The study of strongly absorbing liquids such as water and aqueous buffers using terahertz absorption spectrometer was presented. water samples were prepared at 22°C using distilled de-ionized water, and distilled de-ionized water buffered at 3 and 8 with mM potassium phosphate. The absorption spectra of distilled de-ionized water and aqueous 50mM phosphate buffers were measured over the frequency range of 0.3-3.72 THz. The measurements below ∼ 1.5 THz were found to be converging with the FIR laser transmission spectroscopy and FIR grating measurements.