Abstract
The adsorption and dissociation of oxygen on the Fe(100) surface has been studied using a combination of methods. High resolution electron energy loss spectroscopy, Auger electron spectroscopy, low energy electron diffraction and temperature programmed reaction spectroscopy have been used to monitor the O 2/Fe(100) adsorption system for various oxygen coverages and annealing conditions. These studies indicate that adsorption of O 2 on the Fe(100) surface at 103 K occurs through a mobile precursor followed by disordered dissociative adsorption. Initially, four-fold hollow sites are occupied by O atoms, followed by bridging sites at higher coverages. A vibrational band near 650 cm −1 is observed at still higher coverages, which may be related to O-O bonding in a highly-perturbed non-dissociated adsorbed oxygen species. The disordered overlayer can be ordered by heating to 923 K. Diffusion-segregation processes are observed on annealing.
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