Abstract
The thickness of a liquid film (≈3.6 µm) forming on an ice electrode is determined by solving the Stefan problem. The electrode melts as a result of Joule heat evolution when the current passes through it. The temperature distributions in the film and ice substrate are found. The radius of curvature of emitting asperities formed as a result of film instability against the surface charge is found to be ≈40 nm. This value provides the intense field evaporation of individual ions and ionic clusters from the top of the asperities at a potential difference of ≈100 V.
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