Abstract
Electromagnetic field energy absorption by electrons on a liquid helium surface in the presence of a dc electric field clamping the electrons to the liquid-vapor interface was measured in the 1.5–2.6°K temperature range and 2.75–25.6 MHz frequency ranges. It is shown that for low surface electron concentrations the absorption is governed mainly by the interaction between the charges and the gaseous helium atoms. It is established that the energy being absorbed, converted to one electron, diminishes as the surface electron concentration increases (N = 108 el/cm2) while the temperature dependence of this quantity changes its nature. The surface electron concentration at which a liquid helium surface becomes unstable was measured.
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