Step contrast reversal in LEEM during Pb deposition on W(110)

Anomalous step contrast in low energy electron microscopy (LEEM) images observed during Pb deposition on a W(110) surface is discussed. The steps are dark on the clean surface, and become bright by Pb deposition at about 200 °C. The contrast reversal is related to the presence of a two-dimensional (...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2009-08, Vol.21 (31), p.314024-314024 (5)
Main Authors: Yasue, T, Amakawa, R, Shimizu, H, Nakaguchi, A, Koshikawa, T, Bauer, E
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Ion and electron beam-assisted deposition
ion plating
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Physics
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Summary:Anomalous step contrast in low energy electron microscopy (LEEM) images observed during Pb deposition on a W(110) surface is discussed. The steps are dark on the clean surface, and become bright by Pb deposition at about 200 °C. The contrast reversal is related to the presence of a two-dimensional (2D) Pb gas on the surface and its atomic density distribution. Upon further deposition the steps become dark again and show an anomalous intensity profile. This change is attributed to the 2D crystallization process.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/21/31/314024