SIMS-AES investigations of the oxygen adsorption on the (110) surface of Fe71Ni29

Oxygen adsorption was investigated on the (110) surface of Fe₇₁Ni₂₉ at room temperature by means of the methods AES and SIMS. Three stages of interaction of oxygen with the surface could be determined. A dissociative chemisorption occurs in the dose range up to 5 L, surface oxides are nucleated between 5 L and about 40 L, and in the case of longer oxygen exposures a thicker oxide layer grows. At first, iron and nickel contribute to the surface reaction in like manner.