Experiments show sub-hertz oscillations of the helium depth in an electron microchannel, attributed to superfluid film flow, which shift the electron Rydberg transition by tens of gigahertz.
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Effect of helium surface fluctuations on the Rydberg transition of trapped electrons
Experiments show sub-hertz oscillations of the helium depth in an electron microchannel, attributed to superfluid film flow, which shift the electron Rydberg transition by tens of gigahertz.