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Electrons on the surface of liquid helium are a widely studied system thatmay also provide a promising method to implement a quantum computer. Oneexperimental challenge in these studies is to generate electrons on the heliumsurface in a reliable manner without heating the cryo-system. An electronsource relying on photoemission from a zinc film has been previously describedusing a high power continuous light source that heated the low temperaturesystem. This work has been reproduced more compactly by using a low powerpulsed lamp that avoids any heating. About 5e3 electrons are collected on 1cm^2 of helium surface for every pulse of light. A time-resolved experimentsuggests that electrons are either emitted over or tunnel through the 1eVbarrier formed by the thin superfluid helium film on the zinc surface. Noevidence of trapping or bubble formation is seen.

A low power photoemission source for electrons on liquid helium