Abstract
Stability of surface electrons on thin helium films adsorbed on solid neon is discussed both theoretically and experimentally. A new type of “bubble” electron which is formed at the interface of liquid helium film and solid neon is examined together with the surface electron. It is shown that the surface electron is definitely stable in pressing electric fields below a critical value which depends on the helium film thickness. An experiment demonstrating the recovery of surface electrons from the bubble states is given.
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