Evidence for the Ir(100) Surface Reconstruction by Field-ion Microscopy

The reconstruction of the Ir(100) surface as well as the transition of the regular bulklike structure into the reconstructed phase by thermal activation at $T>\mathrm{}800\mathrm{}$ K has been observed in a field-ion microscope. The field-ion microscope image of the thermally stable reconstructed surface supports the rippled quasihexagonal structure model for Ir(100) (1×5) already developed from LEED structure analyses.