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A terahertz spectroscopic study of the dynamics of monomolecular water layers absorbed on the surface of clay minerals is reported. The THz frequency absorption coefficient of the water monolayer is observed to be substantially lower than the value established for bulk water. The experimental results are in qualitative agreement with recently published calculations of the correlation function of the...
Measurements of the absorption coefficients α of K+ —, Li+ — and Na+ — montmorillonites in the 0.2 to 1.4 THz frequency band are reported. The absorption of THz-radiation by K+ — montmorillonite is notably weaker than the absorption of THz-radiation by Li+ — and Na+ — montmorillonites. The observed difference of THz absorption coefficients is explained by the naturally lower water content of K+ —...
The real and imaginary parts of the complex index of refraction of montmorillonite between 0.2THz and 1.4THz at room temperature are reported. The optical properties of montmorillonite in this frequency range were experimentally determined using time-domain THz spectroscopy. The index of refraction of montmorillonite is n=2.19±0.02, and the extinction coefficient is k=0.10±0.01. Distinct frequency...
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