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Surface barrier in metals: A new model with application to W(001)

American Physical Society
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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).

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