by J. de la Figuera, J. M. Puerta, J. I. Cerda, F. El Gabaly and K. F. McCarty
Abstract:
While a perfect hcp (0001) 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-energy 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 456K.
Reference:
J. de la Figuera, J. M. Puerta, J. I. Cerda, F. El Gabaly and K. F. McCarty, “Determining the structure of Ru(0001) from low-energy electron diffraction of a single terrace”, Surface Science, vol. 600, no. 9, pp. L105–L109.
Bibtex Entry:
@article{de_la_figuera_determining_2006,
title = {Determining the structure of {Ru}(0001) from low-energy electron diffraction of a single terrace},
volume = {600},
issn = {0039-6028},
url = {http://www.sciencedirect.com/science/article/pii/S003960280600210X},
doi = {10.1016/j.susc.2006.02.027},
abstract = {While a perfect hcp (0001) 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-energy 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 456K.},
number = {9},
urldate = {2017-07-21},
journal = {Surface Science},
author = {de la Figuera, J. and Puerta, J. M. and Cerda, J. I. and El Gabaly, F. and McCarty, K. F.},
month = may,
year = {2006},
keywords = {Hexagonal close packed surface, Hydrogen, Low-energy electron diffraction (LEED), Low-energy electron microscopy (LEEM), Ruthenium, Surface relaxation and reconstruction},
pages = {L105--L109},
file = {ScienceDirect Snapshot:E:\cmam_papers\files\508\S003960280600210X.html:text/html;ScienceDirect Snapshot:E:\Usuarios\Administrator\Zotero\storage\FU6EW554\S003960280600210X.html:text/html},
}