Determining the structure of Ru(0001) from low-energy electron diffraction of a single terrace

de la Figuera, J.; Puerta, J. M.; Cerda, J. I.; Gabaly, F. El; McCarty, K. F.

doi:10.1016/j.susc.2006.02.027

arXiv 2006-01-20 DOI 10.1016/j.susc.2006.02.027 0 views

Determining the structure of Ru(0001) from low-energy electron diffraction of a single terrace

de la Figuera, J. · Puerta, J. M. · Cerda, J. I. · Gabaly, F. El · McCarty, K. F.

Materials Science

Original · EN

While a perfect hcp (0001) surface has three-fold symmetry, the diffraction patterns commonly obtained are six-fold symmetric. This apparent change in symmetry occurs because on a stepped surface, the atomic layers on adjacent terraces are rotated by 180 degrees. Here we use a Low-Energy Electron Microscope to acquire the three-fold 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.

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