Abstract
The chemisorption and desorption of Fe at the (10 10) surface of Ru has been investigated by LEED, Auger spectroscopy, Δφ and thermal desorption measurements over a substrate temperature range of 300–900 K. The growth mode of the iron deposit was found to be strongly dependent on the temperature. At 300 K up to seven iron monolayers could be grown, these adopting the configuration of the fcc (111) plane of bulk γ-iron. The layers were metastable and heating of such films or deposition at elevated temperatures resulted in nucleation and growth of crystallites. Only a single Fe desorption peak ( E d ≈ 250 kJ mol−1) was observed over the whole coverage regime; this is assigned to the evaporation of iron atoms in contact with the ruthenium substrate, either pre-existing in the first monolayer or supplied from the Fe crystallites.
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