Adatom-Adatom Pair Interactions and Adlayer Superstructure Formation
The force laws governing the interaction of two atoms adsorbed on a solid surface are fundamental information vital to an atomistic understanding of many surface phenomena, such as the atom transport phenomena in crystal growth and surface catalyzed chemical reactions, in adlayer superstructure formation and two dimensional phase transformation, and in adsorption and desorption phenomena etc. Several possible effects have been considered theoretically. Adatoms possess surface induced dipole moments. A dipole-dipole interaction gives rise to a repulsive interaction which decays with distance rapidly.1,2 van der Waals interaction exists between all adatom pairs, and is attractive.3 Elastic distortion of the substrate lattice by the adsorption of two adatoms will induce an interaction between the two adatoms.4 An interaction induced by the substrate phonon field has been considered.5 The most actively pursued effect has been the so-called “electronic indirect adatomadatom interaction.” This interaction arises from a mutual perturbation of the substrate electronic charge distribution by the adatoms. 6–11 This interaction exhibits an oscillatory tail.
KeywordsPair Interaction Pair Energy Body Effect Desorption Phenomenon Oscillatory Tail
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