1. Clusters, molecular layers, and 3D crystals of water on Ni(111).

    Journal of Chemical Physics 141(18):18C520 (2014) PMID 25399185

    We examined the growth and stability of ice layers on Ni(111) up to ∼7 molecular layers (ML) thick using scanning tunneling microscopy. At low coverage, films were comprised of ∼1 nm wide two-dimensional (2D) clusters. Only above ∼0.5 ML did patches of continuous 2D layers emerge, coexisting wit...
  2. Clusters, molecular layers, and 3D crystals of water on Ni(111).

    Journal of Chemical Physics 141(18):18C520 (2014) PMID 25399185

    We examined the growth and stability of ice layers on Ni(111) up to ∼7 molecular layers (ML) thick using scanning tunneling microscopy. At low coverage, films were comprised of ∼1 nm wide two-dimensional (2D) clusters. Only above ∼0.5 ML did patches of continuous 2D layers emerge, coexisting wit...
  3. Clusters, molecular layers, and 3D crystals of water on Ni(111).

    Journal of Chemical Physics 141(18):18C520 (2014) PMID 25399185

    We examined the growth and stability of ice layers on Ni(111) up to ∼7 molecular layers (ML) thick using scanning tunneling microscopy. At low coverage, films were comprised of ∼1 nm wide two-dimensional (2D) clusters. Only above ∼0.5 ML did patches of continuous 2D layers emerge, coexisting wit...
  4. K+-hydration in a low-energy two-dimensional wetting layer on the basal surface of muscovite.

    Journal of Chemical Physics 139(7):074705 (2013) PMID 23968105

    Density Functional Theory points to a key role of K(+) solvation in the low-energy two-dimensional arrangement of water molecules on the basal surface of muscovite. At a coverage of 9 water molecules per 2 surface potassium ions, there is room to accommodate the ions into wetting layers wherein ...
  5. K+-hydration in a low-energy two-dimensional wetting layer on the basal surface of muscovite.

    Journal of Chemical Physics 139(7):074705 (2013) PMID 23968105

    Density Functional Theory points to a key role of K(+) solvation in the low-energy two-dimensional arrangement of water molecules on the basal surface of muscovite. At a coverage of 9 water molecules per 2 surface potassium ions, there is room to accommodate the ions into wetting layers wherein ...
  6. CO-induced smoluchowski ripening of Pt cluster arrays on the graphene/Ir(111) moiré.

    ACS Nano 7(3):2020 (2013) PMID 23379255

    Regular Pt cluster arrays grown on the moiré template formed by graphene on Ir(111) were tested for their stability with respect to CO gas exposure. Cluster stability and adsorption-induced processes were analyzed as a function of cluster size, with in situ scanning tunneling microscopy and X-ra...
  7. CO-induced smoluchowski ripening of Pt cluster arrays on the graphene/Ir(111) moiré.

    ACS Nano 7(3):2020 (2013) PMID 23379255

    Regular Pt cluster arrays grown on the moiré template formed by graphene on Ir(111) were tested for their stability with respect to CO gas exposure. Cluster stability and adsorption-induced processes were analyzed as a function of cluster size, with in situ scanning tunneling microscopy and X-ra...
  8. Evidence for interlayer coupling and moiré periodic potentials in twisted bilayer graphene.

    Physical Review Letters 109(18):186807 (2012) PMID 23215315

    We report a study of the valence band dispersion of twisted bilayer graphene using angle-resolved photoemission spectroscopy and ab initio calculations. We observe two noninteracting cones near the Dirac crossing energy and the emergence of van Hove singularities where the cones overlap for larg...
  9. Evidence for interlayer coupling and moiré periodic potentials in twisted bilayer graphene.

    Physical Review Letters 109(18):186807 (2012) PMID 23215315

    We report a study of the valence band dispersion of twisted bilayer graphene using angle-resolved photoemission spectroscopy and ab initio calculations. We observe two noninteracting cones near the Dirac crossing energy and the emergence of van Hove singularities where the cones overlap for larg...
  10. A unique vibrational signature of rotated water monolayers on Pt(111): predicted and observed.

    Journal of Chemical Physics 134(20):204702 (2011) PMID 21639462

    Six H-bonds in the periodic di-interstitial structure that accounts for scanning tunneling microscope images of "√37" and "√39" wetting layers on Pt(111) are some 0.2 Å shorter than H-bonds are in ice Ih. According to a broadly obeyed correlation, this density functional theory result implies a...
  11. A unique vibrational signature of rotated water monolayers on Pt(111): predicted and observed.

    Journal of Chemical Physics 134(20):204702 (2011) PMID 21639462

    Six H-bonds in the periodic di-interstitial structure that accounts for scanning tunneling microscope images of "√37" and "√39" wetting layers on Pt(111) are some 0.2 Å shorter than H-bonds are in ice Ih. According to a broadly obeyed correlation, this density functional theory result implies a...
  12. Interpretation of high-resolution images of the best-bound wetting layers on Pt(111).

    Journal of Chemical Physics 133(15):154703 (2010) PMID 20969415

    Two interpretations have been proposed of dark triangles observed in scanning tunneling microscopy (STM) images of the best bound, √37×√37-R25.3°, and √39×√39-R16.1° periodic water monolayers on Pt(111). In one, a "Y"-shaped tetramer of water molecules is removed, leaving a vacancy island behind...
  13. Interpretation of high-resolution images of the best-bound wetting layers on Pt(111).

    Journal of Chemical Physics 133(15):154703 (2010) PMID 20969415

    Two interpretations have been proposed of dark triangles observed in scanning tunneling microscopy (STM) images of the best bound, √37×√37-R25.3°, and √39×√39-R16.1° periodic water monolayers on Pt(111). In one, a "Y"-shaped tetramer of water molecules is removed, leaving a vacancy island behind...
  14. Pentagons and heptagons in the first water layer on Pt(111).

    Physical Review Letters 105(2):026102 (2010) PMID 20867718

    Scanning tunneling topography of long-unexplained "square root of 37" and "square root of 39" periodic wetting arrangements of water molecules on Pt(111) reveals triangular depressions embedded in a hexagonal H2O-molecule lattice. Remarkably, the hexagons are rotated 30° relative to the "classic...
  15. Pentagons and heptagons in the first water layer on Pt(111).

    Physical Review Letters 105(2):026102 (2010) PMID 20867718

    Scanning tunneling topography of long-unexplained "square root of 37" and "square root of 39" periodic wetting arrangements of water molecules on Pt(111) reveals triangular depressions embedded in a hexagonal H2O-molecule lattice. Remarkably, the hexagons are rotated 30° relative to the "classic...
  16. Surface water: Pentagonal ice in chains.

    Nature Materials 8(5):372 (2009) PMID 19387451

  17. Surface water: Pentagonal ice in chains.

    Nature Materials 8(5):372 (2009) PMID 19387451

  18. Water--From Interfaces to the Bulk. Concluding remarks.

    Faraday Discussions 141:467 (2009) PMID 19227370

  19. Water--From Interfaces to the Bulk. Concluding remarks.

    Faraday Discussions 141:467 (2009) PMID 19227370

  20. Kinetics and thermodynamics of carbon segregation and graphene growth on Ru(0 0 0 1)

    Carbon 47(7):1806 (2009)

    We measure the concentration of carbon adatoms on the Ru(0 0 0 1) surface that are in equilibrium with C atoms in the crystal’s bulk by monitoring the electron reflectivity of the surface while imaging. During cooling from high temperature, C atoms segregate to the Ru surf...