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Room temperature surface diffusion mechanisms observed by scanning tunneling microscopy
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no DOI — not checkedThe XPS data are available as Web tables 1 and 2 and Web fig. 1 available at Science Online www.sciencemag.org/cgi/content/full/291/5506/1019/DC1.
no DOI — not checkedT. van der Boom-Moav personal communication.
no DOI — not checkedAs shown in the bottom row of Table 1 the gap in this 20-layer sample is smaller than expected (∼32 nm instead of an expected ∼40 nm). This difference might be due to changes in packing of the layers after several adsorptions or to a tilt of the structure.
no DOI — not checkedA. Hatzor P. S. Weiss in preparation.
no DOI — not checkedIn some samples after the lift-off process the gap was wider than expected from the multilayer borderline. This phenomenon might be the result of annealing of the newly formed metal wire into a more stable thinner form caused by the lift-off process. These samples were excluded from the calculation.
no DOI — not checkedWe thank E. Basgall T. Kuzma J. Lonjin and A. Mieckowski for technical assistance and R. Hengstebeck for XPS measurements. We also thank T. Mallouk and R. Davis for helpful discussions and D. Allara for the use of his ellipsometer. Supported by the Army Research Office the Defense Advanced Research Projects Agency the National Science Foundation and the Office of Naval Research.
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