A Revised Leed Determination of the Relaxations Present at the (3 11) Surface of Copper
نویسنده
چکیده
Low-energy electron diffraction (LEED) has been used to determine the structural relaxations present at the (3 1 1) surface of copper. Two sets of intensity vs energy curves were measured for normal incidence for 14 beams over a total energy range of 1932 eV. These data were compared with intensities calculated with the layer doubling method for a range of structural models, the comparisons being made with both the Zanazzi-Jona and Pendry R-factor schemes. Average values for the first and second interlayer spacings, and percentage changes from the bulk value, are found to be d, = 0.96 + 0.02 A (11.9%) and dz = 1.11 + 0.02A (+ 1.8%) respectively. These percentage changes are much closer to the theoretical relaxations (12.2% and + 4.4% respectively) calculated by Jiang et al. [Phys. Rev. B35, 7952 (1987)] than those indicated earlier by LEED for the Cu(3 1 1) surface using a 1978 data base.
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تاریخ انتشار 2002