Abstract
A formula is obtained for the temperature dependence of onset evaporation field F, namely 1/F=b+CT12/, where b and C are constant for a chosen onset flux. The formula is based on a parabolic surface-atom bonding well, and should be applicable in a limited temperature range to materials that field evaporate via a Gomer-type escape mechanism. A good fit with experiment is found for tungsten and molybdenum in the temperature range 60K to 150K. Deviations from linearity below 60K may be a clear indication of heavy-ion tunnelling.
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