title: Highly proton-ordered water structures on oxygen precovered Ru{0001}.
abstract: We present helium scattering measurements of a water ad-layer grown on a O(2 × 1)/Ru(0001) surface. The adsorbed water layer results in a well ordered helium diffraction pattern with systematic extinctions of diffraction spots due to glide line symmetries. The data reflects a well-defined surface structure that maintains proton order even at surprisingly high temperatures of 140 K. The diffraction data we measure is consistent with a structure recently derived from STM measurements performed at 6 K. Comparison with recent DFT calculation is in partial agreement, suggesting that these calculations might be underestimating the contribution of relative water molecule orientations to the binding energy.
authors.affiliation: Shulich Faculty of Chemistry, Technion, Haifa 32000, Israel.
authors.forename: N
authors.initials: N
authors.lastname: Avidor
authors.forename: H
authors.initials: H
authors.lastname: Hedgeland
authors.forename: G
authors.initials: G
authors.lastname: Held
authors.forename: A P
authors.initials: AP
authors.lastname: Jardine
authors.forename: W
authors.initials: W
authors.lastname: Allison
authors.forename: J
authors.initials: J
authors.lastname: Ellis
authors.forename: T
authors.initials: T
authors.lastname: Kravchuk
authors.forename: G
authors.initials: G
authors.lastname: Alexandrowicz