Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.39: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
New ordered structures of ω-(4’-methyl-biphenyl-4-yl)alkanethiols Bp4 evaporated under UHV conditions on Au(111) surfaces — •Mirko Müller1,2 and Gerhard Pirug1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology
Depending on the evaporation conditions we observed under UHV two new structures for ω-(4’-methyl-biphenyl-4-yl)alkanethiols (Bp4) molecules adsorbed on Au(111) surfaces using a Micro-Channel-Plate (MCP)-LEED system. The resulting patterns could be identified assuming a
(
| 1 | 2 |
| 12 | 1 |
)((√3 x √133)∠ 85.7∘) and a (
| 14 | 7 |
| 0 | 7 |
) ((7√3 x 7)∠ 90∘) unit cell. Possible surface structures will be discussed on the basis of a detailed interpretation of these LEED patterns. Apart from the corresponding sharp spots of the (√3 x √133)∠ 85.7∘ structure the first pattern contains streaks lining up at positions which would be expected for additional spots from a (
| 2 | 4 |
| 12 | 1 |
) ((2√3 x √133)∠ 85.7∘) structure. These streaks result from characteristic domain shapes und boundaries. Missing spots in the (7√3 x 7)∠ 90∘ pattern can be explained by a pgg symmetry group with two perpendicular glide mirror planes. Consequences on the packing within such selfassembled layer of Bp4 molecules will be discussed.