Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 11: Epitaxy and growth I

O 11.7: Talk

Monday, March 27, 2006, 16:30–16:45, WIL A317

Two new phases of CO monolayers on Ag(100) — •Hans-Christoph Ploigt, François Patthey, Marina Pivetta, and Wolf-Dieter Schneider — Ecole Polytechnique Fédérale de Lausanne, Institut de Physique des Nanostructures, CH-1015 Lausanne, Switzerland

We used low-temperature scanning tunneling microscopy to characterise the growth mode of CO monolayers on a cold Ag(100) substrate. CO was dosed at substrate temperatures between 150 K and 250 K. The CO was adsorbed on the substrate and formed two new phases in the submonolayer regime which coexist in the studied temperature range. One is a slightly disordered hexagonal phase without translational symmetry. The average intermolecular distance is 440±20 pm. The other one has a rectangular lattice unit cell with the dimensions a = 1.62±0.12 pm and b = 0.83±0.06 pm. For a substrate temperature above 250 K, CO desorption was observed.