An STM Study of Atomically-Flat Gold Surfaces Irradiated with Energetic Helium and Argon Ions (original) (raw)

Ion Beam Modification of Materials, 1996

Abstract

{111} and {100} oriented crystallites of Au have been irradiated to different fluences, at room temperature, with 3 keV He + and Ar + ions and changes in surface atomic morphology observed subsequently in an air operated Scanning Tunnelling Microscope. The different ion species produce very different topographic features which also behave differently with respect to long time room temperature annealing. He + bombardment produces raised bumps on the surface which, it is believed, are associated with subsurface gas filled bubbles. These features are thermally stable at room temperature. Ar + bombardment produces a continuously roughening topography with increasing ion fluence which is composed of etch pits and adatom islands. It is concluded that these are produced by sputtering and radiation produced interstitial atom migration from the bulk respectively. Surface and interlayer defect and atom migration may be inferred from the observed infilling of pits from islands during thermal annealing.

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