Experimental study of coupled electron-ripplon vibrations of the 2D electron crystal at the surface of liquid helium

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Abstract
We study radio frequency absorption spectra of the 2D electron system at the surface of liquid helium, by working at fixed frequency and scanning the electron areal density. We observe the liquid to solid transition of the 2D electron system. In the solid phase, we observe two series of signals of the coupled electron-ripplon vibration spectrum. The interpretation of these signals leads to a determination of the Debye-Waller factor W1, and of the ripplon relaxation time