Regensburg 2004 – wissenschaftliches Programm
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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- NOX 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 Nad species on the Au(110) surface.