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We have used scanning photoemission microscopy (SPEM) and low energy electron microscopy (LEEM) to investigate the equilibration of the submonolayer surface phases and silicide islands formed in the reactive system Co-Si(111). Real-time LEEM images of the surface during annealing show an irreversible conversion of the close-packed, ordered (7x7) 'ring-cluster' phase, into a lower density, disordered...
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