Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)

O 14.29: Poster

Montag, 27. März 2006, 18:00–21:00, P2

Adatom - and vacancy cluster creation on Cu(001) — •Georgiana Stoian, Raoul van Gastel, Herbert Wormeester, and Bene Poelsema — University of Twente, Enschede, The Netherlands

The collision of a noble gas ion with a surface results in a multitude of processes, including the emission of substrate atoms in the vacuum and the creation of adatoms, surface - and bulk vacancies. On the time scale of the ion impact these processes are virtually independent of temperature. Between ion impacts in the same microscopic area, depending on substrate temperature, diffusion processes can dramatically alter the morphology due to the coarsening and annihilation of adatom - and vacancy clusters. The temperature dependence between 200 and 300 K of the resulting morphology of Cu(001) is studied with STM for very low fluences, i.e. the regime in which only about 1% of the surface atoms has been hit by an incoming ion. The use of Ar ions with energy of 800 eV limits the depth-range of the ion impact to the very surface region.