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A new model of the surface barrier at a metal surface is presented. It is one dimensional, has two adjustable parameters z₀, the location of the image plane, and, which determines the length scale of the transition from vacuum to bulk), and its form is suggested by the results of self-consistent electronic-structure calculations for a five-layer film of W (001) described here. The optimum form for electrons with incident energies below 10 eV is determined by comparison with available low-energy-electron-diffraction data from W (001).
Jones et al. (Fri,) studied this question.