Balakin D. Investigation of adsorption interaction of oxygen and carbon monoxide with the surface (110) of molybdenum single crystal.

The thesis deals with experimental investigation of the adsorption interaction of oxygen (including the formation of the oxide nanolayer) and CO with the surface (110) of the single crystal of molybdenum. The research is performed in the ultra high vacuum "black chamber", which allows us to conduct a vacuum procedure at 10-11 Torr and eliminate the distorting effects of the secondary processes on the walls of the chamber. In order to study the kinetics of adsorption of O2 and CO, the molecular beam method was used at the effusive gas source temperature 78 - 1000 K and at different substrate temperatures (78 - 2300 K). This provided the unique opportunity to determine the true composition of the desorbed products and kinetics of the adsorption processes. The role of both intrinsic and extrinsic precursors has been revealed and probable mechanisms of the adsorbed layers O-Mo (110) and CO-Mo(110) formation have been proposed. The sticking probabilities of CO and O2 on the molybdenum surface have been determined. The features of the formation of oxide nanolayers and corrosion destruction of Mo(110) surface during oxidation were revealed. The probability of capturing an atom of molybdenum in the oxide state at the oxidation process has been calculated. The influence of lateral interactions between the adsorbed molecules on the kinetics of adsorption-desorption processes has been found out. In the case of oxides the lateral interaction is attractive, which leads to an increase in the thermal stability of the oxide layer on the surface. For carbon monoxide, a repulsive interaction between molecules of CO has been revealed. This interaction results in the emergence of fine structure spectrum of TPD in a low-temperature ?-phase.