Laser field and distance between two atoms effects on chemisorption process for system K2-W (100)‎

Abstract EN

In this study, a mathematical model is presented to study the chemisorption of two interacting atoms on solid surface in the presence of a laser field .The mathematical model is based on the occupation numbers formula that depends on the laser field, which we derived according to Anderson model for single atom adsorbed on solid surfaces.

Occupation numbers formula and chemisorption energy formula are derived for two interacting atoms (as a diatomic molecule ) as they approach the surface taking into account the correlation effects on each atom and between atoms.

This model is characterized by obvious dependence of all relations on the system variables and the laser field characteristics which give, a precise description of the molecule – surface interaction dynamics as a function of the normal distance from the surface and the distance between atoms .Our mathematical model is applied to the K2 / W(100) system.

It is found that the type of interaction between the atoms and surface , whether it is repulsive or attractive, is determined by the laser strength where the repulsion between the two atoms increases with the laser strength increasing .

Therefore it makes sure that the laser field can be considered as a tool to control the ionization and dissociation processes that happen on the solid surface.