Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 17: Poster Session I (Nanostructures at Surfaces; Metal Substrates: Epitaxy and Growth; Methods: Scanning Probe Techniques; Phase Transitions)

O 17.32: Poster

Montag, 26. März 2007, 17:30–20:30, Poster C

Interaction of propene with the clean and oxygen-covered Au(110)*(1x2) surface — •Inga Spreine and Klaus Christmann — Institut für Chemie und Biochemie, FU Berlin, Germany

The adsorption and reaction of propene (C₃H₆) on the (1x2) reconstructed Au(110) surface has been studied in the temperature range from 30 K to 500 K by means of low energy electron diffraction (LEED), UV photoemission (UPS), temperature-programmed thermal desorption (TPD) and work function change (Δ Φ) measurements. On the clean Au surface increasing exposures (0,06⋯ 9,0 L) lead to molecular adsorption in monolayers and multilayers; six different adsorption states can be attributed to chemisorbed and weakly held (physisorbed and condensed) propene, respectively. Upon heating, associative desorption sets in at 85 K and ends at 260 K. In the accessible temperature and coverage range, no ordered LEED phases can be observed indicating the absence of phases with long-range order. According to a recipe by Gottfried et al. [1] we used electron irradiation of physisorbed O₂ layers to accumulate reactive oxygen atoms at the surface and studied both the adsorption and reaction of propene with the O-covered Au(110). Our results are discussed and compared with similar investigations reported recently for the Au(100) and Au(111) surfaces [2,3].

[1] M.Gottfried et al., Surf.Sci. 511 (2002) 65; [2] K.A.Davis and D.W.Goodman, J.Phys.Chem. B 104 (2000) 8557; [3] X.Deng et al., J.Phys.Chem. B 110 (2006) 15982.