| Abstract
| - Using a combination of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations,we study the adsorption structure of NO on Pd(111) at pressures of up to 720 Torr. From atomically resolvedSTM images, we identify, at high pressures, only the (2 × 2)-3NO structure, which is identical with thehighest NO-coverage structure found at low pressure and low temperature. DFT calculations confirm that the(2 × 2)-3NO structure is indeed the most stable adsorption structure at high pressures. Contrary to recentsuggestions in the literature, we therefore conclude that we find no evidence for a (3 × 3)-7NO structure onPd(111) at high NO pressure.
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