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Publication Citation: Measurement of the Surface Density of States by Field Ionization

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Author(s): David R. Penn;
Title: Measurement of the Surface Density of States by Field Ionization
Published: October 01, 1975
Abstract: It is shown that recent measurements of field ion energy distributions from clean tungsten surfaces probe the density of metal states in the vicinity of the surface. We find j() = (2/kh)m| d3rm(r) z|2(-m), where j() is the ion current a , mand m are electronic metal eigenfunctions and eigenvalues in the presence of the external electric field used in field ionization and (z) is a function which is large near the noble gas atom. An explicit expression for (z) is given in the text. It is estimated that tungsten metal states with values of k|| at least as large as 0.5 {Aring}-1 make an appreciable contribution to j() where k|| is the electron momentum parallel to the surface. Return to Publications List
Citation: Surface Science
Volume: 52
Issue: 2
Pages: pp. 270 - 276
Research Areas: Surface Physics