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.

An ion beam propagating through a magnetized dusty plasma cylinder drives electrostatic dust ion cyclotron waves to instability via Cerenkov interaction. The growth rate of the instability increases with the relative density δ (=n0i/n0e) of negatively charged dust. The growth rate scales as the one-third power of the beam density. The frequency of the unstable wave also increases with the relative density δ of negatively charged dust. The results of the theory are applied to explain some of the experimental observations of Barkan et al. [Planet. Space Sci. 43, 905 (1995)].

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It is confirmed experimentally that the self-interaction of electron Bernstein waves occurs by means of nonlinear cyclotron (Landau) damping. This wave-particle interaction occurs in a relatively broad frequency range: 1.46 < co/co c < 1.54, 1.60 < (o/co c < 1.75. The virtual wave is observed most strongly at the half-harmonic electron cyclotron frequency near co/(o c = 1.5. Although this self-interaction always occurs for k\\v t /co c ;S0.1, the virtual wave cannot be detected for k\\ut/co c^0 A5.