Abstract
Using atom-probe spectroscopy we measured the activation energy for desorption and the position of He on W for fields between 3 and 5 V/\AA{}. A tight-binding cluster model with local fields from jellium calculations reproduces the data and gives the image plane as 0.8 \AA{} above the topmost lattice plane. The desorption energy increases by a factor of 20 and the equilibrium position reduces from 3.3 \AA{} in $F=0 \mathrm{to} \ensuremath{\sim}2$ \AA{} in $Fg3$ V/\AA{}. This is interpreted as a transition from physisorption to weak field-induced chemisorption.
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