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The diffusion of potassium on the polycrystalline iron surface modified by adsorbed oxygen and nitrogen has been studied by means of AES. The migration of potassium atoms has been observed independently on the constitution of the iron surface in the temperature range between 300 and 450°C. The final concentration of potassium on the iron surface increases with temperature from 300 to 400°C, irrespective...
The kinetics of the oxidation of the Fe(111) surface (clean and covered with potassium) have been studied using the AES method. The results have been discussed taking into account the mosaic structure of the single crystal sample. The real sticking coefficient of oxygen on the clean iron surface has been determined as a function of oxygen coverage s=s 0 (1 - θ). The adsorption of the oxygen...
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