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Measurements of the linewidths of interedge magnetoplasmons are reported for electrons on liquid helium in a temperature range from 200 to 600 mK and in a magnetic field Bϭ1 T. The linewidths show an abrupt increase at a certain temperature. This temperature changes if the electron density is altered and can be related to the crystallization temperature. At the frequencies used, the effect on conventional edge magnetoplasmons is only very weak. ͓S0163-1829͑98͒05828-7͔

The magnetocapacitance of a two-dimensional electron system (2DES) is investigated experimentally, both under and away from Quantum Hall (QH) conditions, at frequencies between 1 kHz and 100 MHz. The nature of the capacitive signal in a bounded 2DES is determined by a resistive cut-off frequency 1/τ ∝ σxx, the longitudinal magnetoconductivity. A new response mechanism is reported for angular frequencies ω > 1/τ , which is controlled by the transverse or Hall conductivity σxy and the boundaries of the sample, even at frequencies far below those of the Edge Magnetoplasma resonances and away from the QH-conditions.