Dresden 2011 – scientific programme

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DS: Fachverband Dünne Schichten

DS 47: Ion Interactions with Nano Scale Materials II (Focused Session -- Organisers: Diesing, Facsko)

DS 47.1: Topical Talk

Thursday, March 17, 2011, 14:45–15:15, GER 37

Trails of kilovolt ions created by subsurface channeling — •Thomas Michely¹, Alex Redinger¹, Sebastian Standop¹, Yudi Rosandi², and Herbert Urbassek² — ¹II. Physikalisches Institut, Universität zu Köln, Germany — ²Fachbereich Physik und Forschungszentrum OPTIMAS, Universität Kaiserslautern, Germany

Using scanning tunneling microscopy, we observe the damage trails produced by keV noble-gas ions incident at glancing angles onto Pt(111). Surface vacancies and adatoms aligned along the ion trajectory constitute ion trails. Atomistic simulations reveal that these straight trails are produced by nuclear (elastic) collisions with surface layer atoms during subsurface channeling of the projectiles. In a small energy window around 5 keV, Xe⁺ ions create vacancy grooves that mark the ion trajectory with atomic precision. The asymmetry of the adatom production on the two sides of the projectile path is traced back to the asymmetry of the subsurface channel. For ripple pattern formation through grazing incidence ion bombardment trail formation is of decisive importance for the regularity and alignment of the resulting erosion morphology.