A. Morgante

University of Trieste

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Co-Authors

Luca Floreano

Istituto Officina dei Materiali

120

D. Cvetko

University of Ljubljana

114

Albano Cossaro

Istituto Officina dei Materiali

Alberto Verdini

Istituto Officina dei Materiali

Gregor Kladnik

University of Ljubljana

R. Gotter

Istituto Officina dei Materiali

F. Tommasini

University of Trieste

A. Goldoni

Elettra-Sincrotrone Trieste S.C.p.A.

Martina Dell’Angela

Istituto Officina dei Materiali

Gregor Bavdek

Istituto Officina dei Materiali

Cooperative Institutions

AREA Science Park

118

University of Trieste

Elettra-Sincrotrone Trieste S.C.p.A.

Istituto Nazionale per la Fisica della Materia

Istituto Officina dei Materiali

Centre National de la Recherche Scientifique

National Interuniversity Consortium for the Physical Sciences of Matter

National Research Council

Columbia University

Sapienza University of Rome

Author Statistics

Papers

Citation

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Atomic-Scale Structure and Catalytic Reactivity of the RuO ₂ (110) Surface

Science (2000)

Herbert Over Y. D. Kim Ari P. Seitsonen Stefan Wendt Edvin Lundgren

The structure of RuO(2)(110) and the mechanism for catalytic carbon monoxide oxidation on this surface were studied by low-energy electron diffraction, scanning tunneling microscopy, and density-functional calculations. The RuO(2)(110) surface exposes bridging oxygen atoms and ruthenium atoms not capped by oxygen. The latter act as coordinatively unsaturated sites-a hypothesis introduced long ago to account for the catalytic activity of oxide surfaces-onto which carbon monoxide can chemisorb and from where it can react with neighboring lattice-oxygen to carbon dioxide. Under steady-state conditions, the consumed lattice-oxygen is continuously restored by oxygen uptake from the gas phase. The results provide atomic-scale verification of a general mechanism originally proposed by Mars and van Krevelen in 1954 and are likely to be of general relevance for the mechanism of catalytic reactions at oxide surfaces.

Atomic units

10.1126/science.287.5457.1474

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Citations (878)

Low-energy vibrations at the InSb(110) surface

Physical review. B, Condensed matter (1995)

Marco Buongiorno Nardelli D. Cvetko Valentina De Renzi Luca Floreano A. Morgante

We present a study of low-energy vibrations at the InSb(110) surface along the \ensuremath{\Gamma}Y\ifmmode\bar\else\textasciimacron\fi{} direction. Surface phonons have been measured by He inelastic scattering and a theoretical analysis has been performed by means of first-principles calculations. We have been able to distinguish the surface acoustic mode above the Rayleigh wave and to identify a surface resonance and an optical surface mode at higher energy. Theoretical calculations are shown to be in agreement with the detected phonon dispersion curves except for the surface resonance which is found 1 meV higher than calculated.

Surface phonon

Bar (unit)

Mode (computer interface)

10.1103/physrevb.52.16720

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Citations (18)

VARIATIONS IN THE LIFETIME OF 3d HOLE STATES IN ULTRATHIN Fe FILMS GROWN ON Cu(100) DEDUCED FROM THE LMM AUGER SPECTRA OF Fe

Surface Review and Letters (2002)

Sergio D’Addato P. Luches R. Gotter Luca Floreano D. Cvetko

The Fe LMM Auger and Auger vacancy satellite spectra of ultrathin Fe films grown on Cu(100) have been measured using photon excitation energies above and below the L 2 ionisation edge, and in coincidence with the Fe 2p 3/2 and Fe 2p 1/2 photoelectrons. A comparison of the relative intensities of the satellites and main Auger transitions indicates that the M 4,5 holes of L 3 M 4,5 double hole states are localised for longer than the L 3 lifetime for the 0.3 and 10 ML coverages but have a lifetime comparable to that of L 3 holes for the 1 ML coverage. The results for the 1 ML coverage are supported by the results of the coincidence experiments. The reasons for the variation in the lifetime of M 4,5 holes are discussed in terms of changes in the number of Fe–Fe neighbours and the density of states at the Fermi energy in these systems.

Photoelectric effect

Auger effect

10.1142/s0218625x02002877

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Citations (15)

Ultrafast Charge Transfer Pathways Through A Prototype Amino-Carboxylic Molecular Junction

Nano Letters (2016)

Gregor Kladnik Michele Puppin Marcello Coreno Monica de Simone Luca Floreano

Charge transport properties of a vertically stacked organic heterojunction based on the amino-carboxylic (A-C) hydrogen bond coupling scheme are investigated by means of X-ray resonant photoemission and the core-hole clock method. We demonstrate that hydrogen bonding in molecular bilayers of benzoic acid/cysteamine (BA/CA) with an A-C coupling scheme opens a site selective pathway for ultrafast charge transport through the junction. Whereas charge transport from single BA layer directly coupled to the Au(111) is very fast and it is mediated by the phenyl group, the interposition of an anchoring layer of CA selectively hinders the delocalization of electrons from the BA phenyl group but opens a fast charge delocalization route through the BA orbitals close to the A-C bond. This evidences that hydrogen bonding established upon A-C recognition can be exploited to spatially/orbitally manipulate the charge transport properties of heteromolecular junctions.

10.1021/acs.nanolett.5b05231

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Citations (16)

Coadsorption of Cs with O and CO on Ru(0001): relation between structural and electronic properties

Progress in Surface Science (2000)

Ying‐Jie Zhu A. Morgante Ari P. Seitsonen Stefan Wendt Y.D Kim

10.1016/s0079-6816(00)00018-6

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Citations (2)

Trimethyltin-Mediated Covalent Gold–Carbon Bond Formation

Journal of the American Chemical Society (2014)

Arunabh Batra Gregor Kladnik Narjes Gorjizadeh Jeffrey Meisner Michael L. Steigerwald

We study the formation of covalent gold–carbon bonds in benzyltrimethylstannane (C10H16Sn) deposited on Au in ultra-high-vacuum conditions. Through X-ray photoemission spectroscopy and X-ray absorption measurements, we find that the molecule fragments at the Sn–benzyl bond when exposed to Au surfaces at temperatures as low as −110 °C. The resulting benzyl species is stabilized by the presence of Au(111) but only forms covalent Au–C bonds on more reactive Au surfaces like Au(110). We also present spectroscopic proof for the existence of an electronic "gateway" state localized on the Au–C bond that is responsible for its unique electronic properties. Finally, we use DFT-based nudged elastic band calculations to elucidate the crucial role played by the under-coordinated Au surface in the formation of Au–C bonds.

Carbon fibers

10.1021/ja5061406

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Citations (26)

Order-disorder character of the(3×3)to(3×<…

Physical review. B, Condensed matter (2001)

L. Petaccia Luca Floreano A. Goldoni D. Cvetko A. Morgante

Growing attention has been drawn in the past years to the \alpha-phase (1/3 monolayer) of Sn on Ge(111), which undergoes a transition from the low temperature (3x3) phase to the room temperature (\sqrt3 x \sqrt3)R30° one. On the basis of scanning tunnelling microscopy experiments, this transition was claimed to be the manifestation of a surface charge density wave (SCDW), i.e. a periodic redistribution of charge, possibly accompanied by a periodic lattice distortion, which determines a change of the surface symmetry. Recent He diffraction studies of the (3x3) long range order have shown the transition to be of the order-disorder type with a critical temperature Tc=220 K and belonging to the 3-state Potts' universality class. These findings clearly exclude an SCDW driven mechanism at 220 K, but they cannot exclude the occurence of a displacive transition at higher temperature. Here we present photoelectron diffraction data taken at 300 K and photoemission data taken up to 500 K (which is the maximum temperature where the (\sqrt3 x \sqrt3)R30° is stable) . From our analysis it is shown that the atomic structure of the Sn overlayer does not change throughout the transition up to 500 K. As a consequence the displacive hypothesis must be discarded in favour of a genuine order-disorder model.

10.1103/physrevb.64.193410

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Citations (28)

l-Tyrosine on Ag(111): Universality of the Amino Acid 2D Zwitterionic Bonding Scheme?

ACS Nano (2010)

Joachim Reichert Agustin Schiffrin Willi Auwärter Alexander Weber‐Bargioni Matthias Marschall

We present a combined study of the adsorption and ordering of the l-tyrosine amino acid on the close-packed Ag(111) noble-metal surface in ultrahigh vacuum by means of low-temperature scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. On this substrate the biomolecules self-assemble at temperatures exceeding 320 K into linear structures primarily following specific crystallographic directions and evolve with larger molecular coverage into two-dimensional nanoribbons which are commensurate with the underlying atomic lattice. Our high resolution topographical STM data reveal noncovalent molecular dimerization within the highly ordered one-dimensional nanostructures, which recalls the geometrical pattern already seen in the l-methionine/Ag(111) system and supports a universal bonding scheme for amino acids on smooth and unreactive metal surfaces. The molecules desorb for temperatures above 350 K, indicating a relatively weak interaction between the molecules and the substrate. XPS measurements reveal a zwitterionic adsorption, whereas NEXAFS experiments show a tilted adsorption configuration of the phenol moiety. This enables the interdigitation between aromatic side chains of adjacent molecules via parallel-displaced π−π interactions which, together with the hydrogen-bonding capability of the hydroxyl functionality, presumably mediates the emergence of the self-assembled supramolecular nanoribbons.

XANES

Non-covalent interactions

Molecular self-assembly

10.1021/nn901669p

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Citations (51)

On-surface trapping of alkali atoms by crown ethers in ultra high vacuum

Nanoscale Advances (2019)

Matuš Stredansky Elia Turco Zhijing Feng Roberto Costantini Giovanni Comelli

Crown ethers, assembled into a regular 2D array

Ultra-high vacuum

10.1039/c9na00144a