ATOMIC RESOLUTION TEM IMAGES OF THE AU(001) RECONSTRUCTED SURFACE

Au(001) reconstructed surface is directly observed in the profile-imaging mode of the surface observation with use of an ultra-high vacuum high resolution 1 Mv electron microscope. Au particles are deposited in-situ in the microscope and clean (001) surfaces are observed along the left bracket 110 right bracket direction. In the image, six atomic rows in the top Au layer form a corrugation so as to fit five atomic rows in the underlying (001) atomic plane of the fcc lattice. The corrugation is due to the reconstruction along the 5 times superperiod direction of the Au(001)5 multiplied by 28 structure. The height of the corrugation is about 0. 03-0. 11 nm in agreement with recent scanning tunneling microscope study of the Au(001) surfaces.