The absorption of radiation in the frequency range 10–80 cm−1 by 2 mol/l electrolyte solutions has been investigated. The absorption at low frequencies below 20 cm−1 is dominantly attributed to the dielectric relaxation of water dipole. At frequencies higher than 40 cm−1, resonance absorption by ion oscillation in a potential well formed by surrounding water molecules comes to contribute to the absorption.

The far infrared absorption spectra of aqueous solution of LiCl have been investigated in a frequency range 8–40 cm−1 at room temperature. In low frequency range (8–20 cm−1), the absorption is mainly controlled by Debye relaxation of the electric dipole rotation, and the absorption decreases with the increase of concentration.

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