Experimental study of energy relaxation of hot electrons on liquid helium-4

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Abstract
We report an experimental investigation of energy relaxation of surface electrons on superfluid helium-4. Electrons are heated by resonant microwave radiation which excites electrons from the ground subband to the first excited subband. The conductivity of electrons is measured under applied microwave radiation and a change of conductivity due to the population of higher excited subbands is recorded. Experimental data are reproduced by numerical calculations, based on a theoretical model developed previously. Fitting calculated data to experimental data allows us to obtain information about energy relaxation of surface electrons. Our results support theoretical predictions for energy relaxation due to two-ripplon emission.

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