title: The adsorption structure of NO on Pd(111) at high pressures studied by STM and DFT.
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 resolved STM images, we identify, at high pressures, only the (2 x 2)-3NO structure, which is identical with the highest NO-coverage structure found at low pressure and low temperature. DFT calculations confirm that the (2 x 2)-3NO structure is indeed the most stable adsorption structure at high pressures. Contrary to recent suggestions in the literature, we therefore conclude that we find no evidence for a (3 x 3)-7NO structure on Pd(111) at high NO pressure.
authors.forename: Ronnie T
authors.initials: RT
authors.lastname: Vang
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Wang
authors.forename: Jan
authors.initials: J
authors.lastname: Knudsen
authors.forename: Joachim
authors.initials: J
authors.lastname: Schnadt
authors.forename: Erik
authors.initials: E
authors.lastname: Laegsgaard
authors.forename: Ivan
authors.initials: I
authors.lastname: Stensgaard
authors.forename: Flemming
authors.initials: F
authors.lastname: Besenbacher