The equations of motion are worked out for the atoms of a semi-infinite crystal covered with a commensurate adsorbate by using the clean crystal as a basis. This procedure produces a complete set of displacement fields consistent with the relevant space-group symmetry. These equations are solved with help of the matching procedure to give the surface even phonon and resonance dispersion curves in the (010) direction of Ni(1OO) covered with a C(2×2) oxygen overlayer. The consequences of the adsorbate induced folding of the Brillouin zone upon the bulk and surface phonons are analysed. Using symmetry adapted coordinates secures a straightforward identification of the loss features observed by EELS.
|Number of pages||12|
|Journal||Journal of Electron Spectroscopy and Related Phenomena|
|Publication status||Published - 1987|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Atomic and Molecular Physics, and Optics
- Surfaces and Interfaces