Investigation of thin helium films with surface-bound electrons

Abstract

We have measured the mobility of electrons above ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ and ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ films condensed on a solid hydrogen substrate. Oscillations in the mobility as a function of film thickness indicate substantial layerwise adsorption of the films up to nine atomic layers. Superfluid and normal films show similar behavior.