
Abstract
Lead layers on copper (100) at coverages from 0.5 to 0.6 were investigated by quantitative LEED and AES measurements and dynamical LEED calculations. Comparisons of intensity measurements with dynamical calculations for the (Wurzel2 x Wurzel2)R45° structure show that the Pb atoms are adsorbed in hollow sites. The Cu---Pb distance is close to the sum of both metallic radii. The dense lead monolayer at a coverage of 0.6 exhibits a c(5 Wurzel2 x Wurzel2)R45° superstructure with cmm symmetry of the diffraction pattern. Calculations for five models were performed under variation of several geometric parameters. Most analogies were found for regular arrangements of distorted (Wurzel2 x Wurzel2)R45° domains, separated by antiphase boundaries. This result is in consistency with observations of poorly ordered (Wurzel2 x Wurzel2)R45° antiphase domains at intermediate coverages.
Item Type: | Journal article |
---|---|
Faculties: | Geosciences > Department of Earth and Environmental Sciences > Crystallography and Materials Science |
Subjects: | 500 Science > 550 Earth sciences and geology |
URN: | urn:nbn:de:bvb:19-epub-5776-4 |
Language: | English |
Item ID: | 5776 |
Date Deposited: | 22. Aug 2008, 07:17 |
Last Modified: | 04. Nov 2020, 12:48 |