Ion beam erosion of graphite surfaces studied by STM: Ripples, self-affine roughening and near-surface damage accumulation
| Autor: | U. Geyer, Wolfgang Bolse, Klaus-Peter Lieb, S. Habenicht, Fabrizio Roccaforte, Carsten Ronning |
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| Rok vydání: | 2000 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Ion beam business.industry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Fluence Ion law.invention Wavelength Optics Highly oriented pyrolytic graphite Sputtering law 0103 physical sciences Collision cascade Scanning tunneling microscope 010306 general physics 0210 nano-technology business Instrumentation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. :958-962 |
| ISSN: | 0168-583X |
| DOI: | 10.1016/s0168-583x(99)00686-2 |
| Popis: | The surface topography of (0 0 0 1) highly oriented pyrolytic graphite eroded by Xenon ions at an incidence tilted relative to the surface normal was measured as function of the tilt angle θ and the ion energy E and fluence Φ by means of scanning tunneling microscopy (STM). Up to about 1018 ions/cm2, the formation of periodic ripple structures was observed. The switching of the wave pattern from parallel to perpendicular orientation relative to the ion beam projection, as predicted for increasing tilt angle θ, was confirmed. Moreover, the wavelength was found to scale with the range and longitudinal straggling width of the collision cascade. This fact allows a direct determination of the mean lateral size of the collision cascade. The dependence of the measured wavelength on the three parameters θ, E and Φ is reproduced by the theory of sputter erosion by Bradley and Harper. The high-fluence regime can be described by the Kardar–Parisi–Zhang theory (KPZ). |
| Databáze: | OpenAIRE |
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