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O: Oberflächenphysik

O 9: Adsorption an Oberfl
ächen (I)

O 9.1: Vortrag

Montag, 11. März 2002, 15:15–15:30, H36

Oxygen Adsorption and the Formation of the Cu(110)(2x1)O-Stripe Phase — •L.D. Sun¹, M. Hohage¹, P. Zeppenfeld¹, RE. Balderas-Navarro², and K. Hingerl³ — ¹Institute of Experimental Physics, Johannes-Kepler-University Linz, A-4040 Linz, Austria — ²Facultad de Ciencias and IICO, Universidad Autonoma de San Luis Potosi, San Luis Potosi, SLP 78000 Mexico — ³Institute of Solid State Physics, Johannes-Kepler-University Linz, A-4040 Linz, Austria

Reflectance Difference Spectroscopy (RDS), LEED and STM have been used to study the temperature evolution of the Cu(110)(2x1)O-stripe phase. Adsorption of submonolayer amounts of oxygen on Cu(110) dramatically reduces the intensity of the surface state transition related RDS peak at 2.1 eV. This decrease is caused by a quenching of the surface state due to randomly distributed short Cu-O strings and surface vacancies. Annealing to 480 K leads to a partial recovery of the signal as a result of the aggregation of the short Cu-O strings into Cu-O stripes and the coalescence of the many small vacancies into large vacancy islands which causes the reappearence of the surface state on large portions of the surface. Annealing to 600 K creates a well ordered Cu(110)-(2x1)O stripe phase with long range order. The ordering process has been simultaneously monitored by LEED and the surface morphology has been imagined with STM.