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O: Oberflächenphysik

O 43: Adsorption an Oberflächen IV

O 43.4: Vortrag

Freitag, 12. März 2004, 12:00–12:15, H36

Nitriding a Gold(110)(1x2) Surface — •P. Schulz¹, M. Gottfried², and K. Christmann¹ — ¹Inst. f. Chemie, FU Berlin, Takustr. 3, 14195 Berlin — ²Dept. of Chem. Eng., Univ. of Washington at Seatle USA

Molecular N₂ does not adsorb dissociatively on Au surfaces. Nevertheless, a study of possible N-Au bonding situations appears to be interesting (in view of e.g. de- NO_X catalysis and semiconducter contacting). So far, the only known research to produce N atoms on Au sufaces at 300 K used N⁺ ion bombardment techniques; the N species formed was characterized by XPS (N 1s core level shifts) [L. Siller et al., Surf. Sci. 513 (2002) 78]. In our combined LEED, UPS, TDS and Δ Φ study we physisorbed N₂ on a Au(110) surface at ∼ 30 K and exposed it to 500 eV electrons. We succeeded in activating the molecules to dissociate into N atoms which are strongly held on Au(110), desorbing around 450 K (physisorbed N₂ desorbs below 50 K). We will communicate data on the energetics and kinetics of the various N_ad species on the Au(110) surface.