Journal
SURFACE SCIENCE
Volume 600, Issue 9, Pages L105-L109Publisher
ELSEVIER
DOI: 10.1016/j.susc.2006.02.027
Keywords
low-eneray electron diffraction (LEED); low-energy electron microscopy (LEEM); ruthenium; hydrogen; surface relaxation and reconstruction; hexagonal close packed surface
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While a perfect hcp (0 0 0 1) surface has threefold symmetry, the diffraction patterns commonly obtained are sixfold symmetric. This apparent change in symmetry occurs because on a stepped surface, the atomic layers on adjacent terraces are rotated by 180'. Here we use a low-eneray electron microscope to acquire the threefold diffraction pattern from a single hcp Ru terrace and measure the intensity vs. energy curves for several diffracted beams. By means of multiple scattering calculations fitted to the experimental data with a Pendry R-factor of 0.077. we find that the surface is contracted by 3.5(+/- 0.9)% at 456 K. (c) 2006 Elsevier B.V. All rights reserved.
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