Volker Krasemann - Academia.edu (original) (raw)
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Papers by Volker Krasemann
MRS Proceedings, 1995
ABSTRACTThe growth of thin Pd, Ni, Fe and Ti films on Al(110) surfaces has been studied using hig... more ABSTRACTThe growth of thin Pd, Ni, Fe and Ti films on Al(110) surfaces has been studied using high-energy ion scattering (HEIS), x-ray photoemission spectroscopy and photoelectron diffraction techniques. Of these four metals, only Ti grows as an epitaxial overlayer, while the other metals mix with the substrate to form surface alloys. In the HEIS experiments the backscattered ion yield from Al surface atoms is measured as a function of metal coverage on the Al surface. A decrease in the Al scattering is observed for Ti deposition while the other metals result in increased Al scattering, attributed to alloy formation. An explanation for the exceptional growth behavior of Ti on Al is provided using a model of surface strain associated with aluminide formation.
Surface Science, 1997
ABSTRACT
Surface Science, 1996
The growth of thin Fe overlayers on A1(110) and AI(001) surfaces has been investigated using high... more The growth of thin Fe overlayers on A1(110) and AI(001) surfaces has been investigated using high-energy ion backscattering (HEIS) and X-ray photoelectron spectroscopy (XPS), for Fe coverages from 0 to 15 ML deposited at room temperature. For the AI(001) surface, measurements of the backscattered ion yields from A1 and Fe atoms show that the Fe atoms do not form a simple overlayer on the AI substrate, but displace A1 atoms from their equilibrium positions to form a mixture of FeAI. The inter-mixing continues up to about 5 ML Fe coverage before Fe metal begins to cover the mixed surface. For the AI(ll0) surface, intermixing of Fe and A1 atoms was observed up to about 9 ML Fe deposition, where Fe metal begins to cover the surface. In neither case was Fe diffusion into the bulk A1 substrate observed. XPS results show no chemical shift larger than the resolution of our measurements for the Fe 2p core level in Fe aluminides. The variation of the Fe XPS photopeak intensity as a function of Fe coverage also supports the two-and three-stage growth models on AI(001) and AI(110) surfaces, respectively.
MRS Proceedings, 1995
ABSTRACTThe growth of thin Pd, Ni, Fe and Ti films on Al(110) surfaces has been studied using hig... more ABSTRACTThe growth of thin Pd, Ni, Fe and Ti films on Al(110) surfaces has been studied using high-energy ion scattering (HEIS), x-ray photoemission spectroscopy and photoelectron diffraction techniques. Of these four metals, only Ti grows as an epitaxial overlayer, while the other metals mix with the substrate to form surface alloys. In the HEIS experiments the backscattered ion yield from Al surface atoms is measured as a function of metal coverage on the Al surface. A decrease in the Al scattering is observed for Ti deposition while the other metals result in increased Al scattering, attributed to alloy formation. An explanation for the exceptional growth behavior of Ti on Al is provided using a model of surface strain associated with aluminide formation.
Surface Science, 1997
ABSTRACT
Surface Science, 1996
The growth of thin Fe overlayers on A1(110) and AI(001) surfaces has been investigated using high... more The growth of thin Fe overlayers on A1(110) and AI(001) surfaces has been investigated using high-energy ion backscattering (HEIS) and X-ray photoelectron spectroscopy (XPS), for Fe coverages from 0 to 15 ML deposited at room temperature. For the AI(001) surface, measurements of the backscattered ion yields from A1 and Fe atoms show that the Fe atoms do not form a simple overlayer on the AI substrate, but displace A1 atoms from their equilibrium positions to form a mixture of FeAI. The inter-mixing continues up to about 5 ML Fe coverage before Fe metal begins to cover the mixed surface. For the AI(ll0) surface, intermixing of Fe and A1 atoms was observed up to about 9 ML Fe deposition, where Fe metal begins to cover the surface. In neither case was Fe diffusion into the bulk A1 substrate observed. XPS results show no chemical shift larger than the resolution of our measurements for the Fe 2p core level in Fe aluminides. The variation of the Fe XPS photopeak intensity as a function of Fe coverage also supports the two-and three-stage growth models on AI(001) and AI(110) surfaces, respectively.