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8 results on '"Stoian, Georgiana"'

1. Radiotherapy quality assurance for mesorectum treatment planning within the multi-center phase II STAR-TReC trial: Dutch results

Author

van den Ende, Roy P. J., Peters, Femke P., Harderwijk, Ernst, Rütten, Heidi, Bouwmans, Liza, Berbee, Maaike, Canters, Richard A. M., Stoian, Georgiana, Compagner, Kim, Rozema, Tom, de Smet, Mariska, Intven, Martijn P. W., Tijssen, Rob H. N., Theuws, Jacqueline, van Haaren, Paul, van Triest, Baukelien, Eekhout, Dave, Marijnen, Corrie A. M., van der Heide, Uulke A., and Kerkhof, Ellen M.

Published
2020
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4. Adatom - and vacancy cluster creation on Cu(001)

Author

Stoian, Georgiana, van Gastel, Raoul, Wormeester, Herbert, Poelsema, Bene, and Physics of Interfaces and Nanomaterials

Subjects
Condensed Matter::Materials Science, Physics::Atomic and Molecular Clusters, METIS-235995
Abstract

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.

Published
2006

8. Novel local free energy minimum on the Cu(001) surface.

Author

Ovsyanko M, Stoian G, Wormeester H, and Poelsema B

Abstract

High-resolution LEED (low-energy electron diffraction) data of Cu(001) reveal an uniaxial in-plane lattice reconstruction by 1%. One-dimensional nanogrooves induced by ion bombardment involve the creation of steps that enable this reconstruction. This is the first verification of van der Merwe's prediction of step facilitated reconstruction. We confirm the predicted dependence on step orientation: <100> steps allow stress-relief and <110> steps do not, consistent with the known elastic anisotropy. Similar behavior is predicted for other nonreconstructed (001) surfaces of 3d and 4d metals.

Published
2004
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