Precise absorption measurements in polar liquids within the frequency range 50 to 600 GHz

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Abstract
The authors describe an experimental set-up to enable precise measurements of the absorption coefficient alpha at values lower than (100 Np cm-1), in the frequency range 50-600 GHz, as a function of temperature and pressure. The accuracy of measurements is within 1 to 2% comparable with the highest accuracy achieved in the microwave region, and much better than the accuracy in the far infra-red (FIR). The present apparatus bridges the gap between FIR and microwave measurements, and using all three methods it is now possible to scan continuously the whole 0-THz frequency range, which allows important progress in molecular dynamic studies in liquids.

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