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Toffoli D, Grazioli C, Monti M, Stener M, Totani R, Richter R, Schio L, Fronzoni G, Cossaro A. Revealing the electronic properties of the B-B bond: the bis-catecholato diboron molecule. Phys Chem Chem Phys 2021; 23:23517-23525. [PMID: 34642728 DOI: 10.1039/d1cp03428f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The electronic properties of a diboron molecule, namely bis(catecholato)diboron (2-(1,3,2-benzodioxaborol-2-yl)-1,3,2-benzodioxaborole) (B2Cat2), have been studied by comparing the results of photoemission (XPS) and near edge X-ray absorption spectroscopy (NEXAFS) experiments with the outcome of DFT calculations. The B 1s, C 1s and O 1s K-edges have been investigated for both the isolated gas phase molecule and the adsorbed one on the Au(111) surface. The main features of the polarized NEXAFS spectra at each of the three edges considered are not significantly affected by the presence of the substrate, with respect to the isolated molecule, indicating that the molecule-gold interaction is weak. Moreover, the comparison between the observed dichroism in the NEXAFS spectra of the adsorbed B2Cat2 and that in the NEXAFS spectra of the isolated molecule has confirmed the orbital symmetry assigned in the gas phase absorption spectra. The transitions to π(B-B) bonding and π*(B-B) anti-bonding final states represent the most relevant probe of the chemistry of the B2Cat2 molecule. We show that their theoretical description requires that the treatment of the relaxation changes among different excited state configurations, which we successfully implemented by using ΔSCF-DFT (ΔSCF) calculations.
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Affiliation(s)
- D Toffoli
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, 34127 Trieste, Italy.
| | - C Grazioli
- IOM-CNR, Istituto Officina dei Materiali-CNR, S.S.14, Km 163.5, 34149 Trieste, Italy
| | - M Monti
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, 34127 Trieste, Italy.
| | - M Stener
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, 34127 Trieste, Italy.
| | - R Totani
- ISM-CNR, Istituto di Struttura della Materia, LD2 Unit, 34149 Trieste, Italy
| | - R Richter
- Elettra-Sincrotrone Trieste, 34149 Basovizza, Trieste, Italy
| | - L Schio
- IOM-CNR, Istituto Officina dei Materiali-CNR, S.S.14, Km 163.5, 34149 Trieste, Italy
| | - G Fronzoni
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, 34127 Trieste, Italy.
| | - A Cossaro
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, 34127 Trieste, Italy. .,IOM-CNR, Istituto Officina dei Materiali-CNR, S.S.14, Km 163.5, 34149 Trieste, Italy
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2
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Carlotto S, Floreano L, Cossaro A, Dominguez M, Rancan M, Sambi M, Casarin M. The electronic properties of three popular high spin complexes [TM(acac) 3, TM = Cr, Mn, and Fe] revisited: an experimental and theoretical study. Phys Chem Chem Phys 2018; 19:24840-24854. [PMID: 28868556 DOI: 10.1039/c7cp04461e] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The occupied and unoccupied electronic structures of three high spin TM(acac)3 (TM = Cr, Mn, and Fe) complexes (I, II, and III, respectively) were studied by revisiting their literature vapour-phase He(i) and, when available, He(ii) photoemission (PE) spectra and by means of original near-edge X-ray absorption fine structure (NEXAFS) spectroscopic data recorded at the O K-edge (OK-edge) and TM L2,3-edges (TML2,3-edges). The assignments of the vapour-phase He(i)/He(ii) PE spectra were guided by the results of spin-unrestricted non-relativistic Slater transition state calculations, while the OK-edge and TML2,3-edge spectroscopic pieces of evidence were analysed by exploiting the results of spin-unrestricted scalar-relativistic time-dependent density functional theory (DFT) and DFT/ROCIS calculations, respectively. Although the actual symmetry (D3, in the absence of any Jahn-Teller distortion) of the title molecules allowed an extensive mixing between TM t2g-like and eg-like atomic orbitals, the use of the Nalewajski-Mrozek TM-O bond multiplicity index combined with a thorough analysis of the ground state (GS) outcomes allowed the assessment of the TM-O bond weakening associated with the progressive TM 3d-based eg-like orbital filling. The experimental information provided by OK-edge spectra was rather poor; nevertheless, the combined use of symmetry, orbitals and spectra allowed us (i) to rationalise minor differences characterizing spectral features along the series, (ii) to quantify the contribution provided by the ligand-to-metal-charge-transfer (LMCT) excitations to the different spectral features, and (iii) to recognize the t2g-/eg-like nature of the TM 3d-based orbitals involved in LMCT transitions. As far as the TML2,3-edge spectra and the DFT/ROCIS results were concerned, the lowest lying I,IIL3 spectral features included states having either the GS spin multiplicity (S(I) = 3/2, S(II) = 2) or, at higher excitation energies (EEs), states with ΔS = ±1. In contrast to that, only states with ΔS = 0, -1 significantly contributed to the IIIL3 spectral pattern. Along the whole series, the L3 higher EE side was systematically characterized by states involving TM2p → π4 MLCT excitations; as such, coupled-single excitations with ΔS = 0 were involved in I and II, while single MLCT TM2p → π4 transitions with ΔS = -1 were involved in III.
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Affiliation(s)
- S Carlotto
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Francesco Marzolo 1, I-35131 Padova, Italy.
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Quiroga Argañaraz B, Cristina LJ, Rodríguez LM, Cossaro A, Verdini A, Floreano L, Fuhr JD, Gayone JE, Ascolani H. Ubiquitous deprotonation of terephthalic acid in the self-assembled phases on Cu(100). Phys Chem Chem Phys 2018; 20:4329-4339. [PMID: 29367986 DOI: 10.1039/c7cp06612k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We performed an exhaustive study of terephthalic acid (TPA) self-assembly on a Cu(100) surface, where first-layer molecules display three sequential phase transitions in the 200–400 K temperature range, corresponding to different stages of molecular deprotonation.
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Affiliation(s)
| | | | | | - A. Cossaro
- CNR-IOM
- Laboratorio TASC
- I-34149 Trieste
- Italy
| | - A. Verdini
- CNR-IOM
- Laboratorio TASC
- I-34149 Trieste
- Italy
| | | | - J. D. Fuhr
- Centro Atómico Bariloche
- CNEA
- Bariloche
- Argentina
| | | | - H. Ascolani
- Centro Atómico Bariloche
- CNEA
- Bariloche
- Argentina
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4
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Costantini R, Pincelli T, Cossaro A, Verdini A, Goldoni A, Cichoň S, Caputo M, Pedio M, Panaccione G, Silly M, Sirotti F, Morgante A, Dell'Angela M. Time resolved resonant photoemission study of energy level alignment at donor/acceptor interfaces. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.04.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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5
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Palacio I, Pinardi AL, Martínez JI, Preobrajenski A, Cossaro A, Jancarik A, Stará I, Starý I, Méndez J, Martín-Gago JA, López MF. Spectroscopic characterization of the on-surface induced (cyclo)dehydrogenation of a N-heteroaromatic compound on noble metal surfaces. Phys Chem Chem Phys 2017; 19:22454-22461. [DOI: 10.1039/c7cp03955g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Connecting polycyclic aromatic hydrocarbons by on-surface chemistry.
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Petrov AY, Torrelles X, Verna A, Xu H, Cossaro A, Pedio M, Garcia-Barriocanal J, Castro GR, Davidson BA. Surface octahedral distortions and atomic design of perovskite interfaces. Adv Mater 2013; 25:4043-4048. [PMID: 23813784 DOI: 10.1002/adma.201301841] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Indexed: 06/02/2023]
Abstract
Atomic engineering of perovskite films and interfaces is significantly improved by in situ optimization of reflection high-energy electron diffraction (RHEED) features resulting from surface BO₆ octahedral rotations seen during molecular-beam epitaxy growth. This approach yields Sr-doped manganite films across the phase diagram with magnetotransport properties that are, for the first time, identical to bulk single crystals. Careful structural analysis of manganite/titanate interfaces shows that cation intermixing and unit cell dilations are eliminated, while BO₆ rotations and Jahn-Teller-type elongations are nearly completely suppressed at the interface.
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Affiliation(s)
- A Yu Petrov
- CNR-IOM TASC National Laboratory, Area Science Park-Basovizza, 34149 Trieste, Italy
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7
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Sedona F, Di Marino M, Forrer D, Vittadini A, Casarin M, Cossaro A, Floreano L, Verdini A, Sambi M. Tuning the catalytic activity of Ag(110)-supported Fe phthalocyanine in the oxygen reduction reaction. Nat Mater 2012; 11:970-977. [PMID: 23085570 DOI: 10.1038/nmat3453] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 09/11/2012] [Indexed: 05/27/2023]
Abstract
A careful choice of the surface coverage of iron phthalocyanine (FePc) on Ag (110) around the single monolayer allows us to drive with high precision both the long-range supramolecular arrangement and the local adsorption geometry of FePc molecules on the given surface. We show that this opens up the possibility of sharply switching the catalytic activity of FePc in the oxygen reduction reaction and contextual surface oxidation in a reproducible way. A comprehensive and detailed picture built on diverse experimental evidence from scanning tunnelling microscopy, X-ray photoelectron spectroscopy and X-ray absorption spectroscopy, coupled with density functional theory calculations, sheds new light on the nature of the catalytically active molecule-surface coordination and on the boundary conditions for its occurrence. The results are of relevance for the improvement of the catalytic efficiency of metallo-macrocycles as viable substitutes for platinum in the cathodic compartment of low-temperature fuel cells.
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Affiliation(s)
- F Sedona
- Dipartimento di Scienze Chimiche, Università di Padova, Via Marzolo 1, 35131 Padova, Italy
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8
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Lipton-Duffin J, Miwa JA, Urquhart SG, Contini G, Cossaro A, Casalis L, Barth JV, Floreano L, Morgante A, Rosei F. Binding geometry of hydrogen-bonded chain motif in self-assembled gratings and layers on Ag(111). Langmuir 2012; 28:14291-14300. [PMID: 22970746 DOI: 10.1021/la303010p] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Upon adsorption on the (111) facet of Ag, 4-[trans-2-(pyrid-4-yl-vinyl)] benzoic acid (PVBA) self-assembles into a highly ordered, chiral twin chain structure at submonolayer coverages with domains that can extend for micrometers in one dimension. Using polarization-dependent measurements of C and N K-shell excitations in near-edge X-ray absorption fine structure (NEXAFS) spectra, we determine the binding geometry of single PVBA molecules within this unique ensemble for both low and high coverage regimes. At submonolayer coverage, the molecule is twisted to facilitate the formation of hydrogen bonds. The gas-phase planarity is gradually recovered as the coverage is increased, with complete planarity coinciding with loss of order in the overlayer. Thermal treatment of the PVBA film results in deprotonation of the carboxyl tail of the molecule, but despite the suppression of the stabilizing hydrogen-bonds, the overlayer remains ordered.
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Affiliation(s)
- J Lipton-Duffin
- Centre Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Université du Québec, 1650 Boulevard Lionel-Boulet, Varennes, QC, J3X 1S2, Canada
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9
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Borghetti P, Ghosh P, Castellarin-Cudia C, Goldoni A, Floreano L, Cossaro A, Verdini A, Gebauer R, Drera G, Sangaletti L. Functional K-doping of eumelanin thin films: Density functional theory and soft x-ray spectroscopy experiments in the frame of the macrocyclic protomolecule model [corrected]. J Chem Phys 2012; 136:204703. [PMID: 22667577 DOI: 10.1063/1.4719211] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We demonstrate the possibility to achieve the doping of eumelanin thin films through K(+) incorporation during the electrodeposition of the film. K-doping changes the optical properties of the eumelanin thin films, reducing the energy gap from 1.0 to 0.6 eV, with possible implications for the photophysical properties. We have identified the doping-related occupied and unoccupied electronic states and their spectral weight using resonant photoemission spectroscopy (ResPES) and x-ray absorption at the C and N K-edges (near edge x-ray absorption fine spectroscopy, NEXAFS). All data are consistently interpreted by ab initio calculations of the electronic structure within the frame of the macrocycle model developed for the eumelanin protomolecule. Our analysis puts in evidence the intercalation of K with one specific oligomer (a tetramer composed of one indolequinone and 3 hydroquinone monomers) in correspondence of the nitrogen macrocycle. The predicted variation of the tetramer spacing is also in agreement with the recent x-ray diffraction experiments. The charge donation from K to N and C atoms gives rise to new electronic states at the top of the valence band and in NEXAFS resonances of the unoccupied orbitals. The saturation of the tetramer macrocycles leaves an excess of K that bind to N and C atoms in alternative configurations, as witnessed by the occurrence of additional spectral features in the carbon-related ResPES measurements.
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Affiliation(s)
- P Borghetti
- I-LAMP and Dipartimento di Matematica e Fisica, Università Cattolica, via dei Musei 41, 25121 Brescia, Italy.
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10
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Borghetti P, Ghosh P, Castellarin-Cudia C, Goldoni A, Floreano L, Cossaro A, Verdini A, Gebauer R, Drera G, Sangaletti L. Publisher's Note: “Functional K-doping of eumelanin thin films: Density functional theory and soft x-ray spectroscopy experiments in the frame of the macrocyclic protomolecule model” [J. Chem. Phys. 136, 204703 (2012)]. J Chem Phys 2012. [DOI: 10.1063/1.4740244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Dell'Angela M, Kladnik G, Cossaro A, Verdini A, Kamenetska M, Tamblyn I, Quek SY, Neaton JB, Cvetko D, Morgante A, Venkataraman L. Relating energy level alignment and amine-linked single molecule junction conductance. Nano Lett 2010; 10:2470-2474. [PMID: 20578690 DOI: 10.1021/nl100817h] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Using photoemission spectroscopy, we determine the relationship between electronic energy level alignment at a metal-molecule interface and single-molecule junction transport data. We measure the position of the highest occupied molecular orbital (HOMO) relative to the Au metal Fermi level for three 1,4-benzenediamine derivatives on Au(111) and Au(110) with ultraviolet and resonant X-ray photoemission spectroscopy. We compare these results to scanning tunnelling microscope-based break-junction measurements of single molecule conductance and to first-principles calculations. We find that the energy difference between the HOMO and Fermi level for the three molecules adsorbed on Au(111) correlate well with changes in conductance and agree well with quasiparticle energies computed from first-principles calculations incorporating self-energy corrections. On the Au(110) that presents Au atoms with lower-coordination, critical in break-junction conductance measurements, we see that the HOMO level shifts further from the Fermi level. These results provide the first direct comparison of spectroscopic energy level alignment measurements with single molecule junction transport data.
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Evangelista F, Ruocco A, Gotter R, Cossaro A, Floreano L, Morgante A, Crispoldi F, Betti MG, Mariani C. Electronic states of CuPc chains on the Au(110) surface. J Chem Phys 2009; 131:174710. [DOI: 10.1063/1.3257606] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Cossaro A, Mazzarello R, Rousseau R, Casalis L, Verdini A, Kohlmeyer A, Floreano L, Scandolo S, Morgante A, Klein ML, Scoles G. X-ray Diffraction and Computation Yield the Structure of Alkanethiols on Gold(111). Science 2008; 321:943-6. [DOI: 10.1126/science.1158532] [Citation(s) in RCA: 269] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- A. Cossaro
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
| | - R. Mazzarello
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
| | - R. Rousseau
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
| | - L. Casalis
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
| | - A. Verdini
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
| | - A. Kohlmeyer
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
| | - L. Floreano
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
| | - S. Scandolo
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
| | - A. Morgante
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
| | - M. L. Klein
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
| | - G. Scoles
- Istituto Nazionale per la Fisica della Materia–Consiglio Nazionale delle Ricerche (INFM-CNR) Laboratorio TASC, I-34012 Trieste, Italy
- International School for Advanced Studies, I-34014 Trieste, Italy
- Sincrotrone Trieste S.C.p.A., I-34012 Trieste, Italy
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, USA
- Abdus Salam International Centre for Theoretical Physics and INFM/Democritos National Simulation Center, I-34014 Trieste, Italy
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14
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Krüger P, Bourgeois S, Domenichini B, Magnan H, Chandesris D, Le Fèvre P, Flank AM, Jupille J, Floreano L, Cossaro A, Verdini A, Morgante A. Defect states at the TiO2(110) surface probed by resonant photoelectron diffraction. Phys Rev Lett 2008; 100:055501. [PMID: 18352385 DOI: 10.1103/physrevlett.100.055501] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2006] [Revised: 11/02/2007] [Indexed: 05/26/2023]
Abstract
The charge distribution of the defect states at the reduced TiO(2)(110) surface is studied via a new method, the resonant photoelectron diffraction. The diffraction pattern from the defect state, excited at the Ti-2p-3d resonance, is analyzed in the forward scattering approach and on the basis of multiple scattering calculations. The defect charge is found to be shared by several surface and subsurface Ti sites with the dominant contribution on a specific subsurface site in agreement with density functional theory calculations.
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Affiliation(s)
- P Krüger
- Institut Carnot de Bourgogne, UMR 5209 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon Cedex, France
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15
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Mazzarello R, Cossaro A, Verdini A, Rousseau R, Casalis L, Danisman MF, Floreano L, Scandolo S, Morgante A, Scoles G. Structure of a CH3S monolayer on Au(111) solved by the interplay between molecular dynamics calculations and diffraction measurements. Phys Rev Lett 2007; 98:016102. [PMID: 17358489 DOI: 10.1103/physrevlett.98.016102] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2006] [Indexed: 05/02/2023]
Abstract
We have investigated the controversy surrounding the (sqrt[3] x sqrt[3]) R30 degrees structure of self-assembled monolayers of methylthiolate on Au(111) by first principles molecular dynamics simulations, energy and angle resolved photoelectron diffraction, and grazing incidence x-ray diffraction. Our simulations find a dynamic equilibrium between bridge site adsorption and a novel structure where 2 CH3S radicals are bound to an Au adatom that has been lifted from the gold substrate. As a result, the interface is characterized by a large atomic roughness with both adatoms and vacancies. This result is confirmed by extensive photoelectron and grazing incidence x-ray diffraction measurements.
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Affiliation(s)
- R Mazzarello
- International School for Advanced Studies, Trieste, Italy
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Cossaro A, Cvetko D, Bavdek G, Floreano L, Gotter R, Morgante A, Evangelista F, Ruocco A. Copper−Phthalocyanine Induced Reconstruction of Au(110). J Phys Chem B 2004. [DOI: 10.1021/jp049108h] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. Cossaro
- Laboratorio TASC dell'Istituto Nazionale per la Fisica della Materia, Basovizza SS-14, Km 163.5, I-34012 Trieste, Italy, Department of Physics, University of Ljubljana, Ljubljana, Slovenia, Jožef Stefan Institute, Ljubljana, Slovenia, Department of Physics, University of Trieste, Trieste, Italy, INFM unit of Roma Tre and Physics Department, University of Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
| | - D. Cvetko
- Laboratorio TASC dell'Istituto Nazionale per la Fisica della Materia, Basovizza SS-14, Km 163.5, I-34012 Trieste, Italy, Department of Physics, University of Ljubljana, Ljubljana, Slovenia, Jožef Stefan Institute, Ljubljana, Slovenia, Department of Physics, University of Trieste, Trieste, Italy, INFM unit of Roma Tre and Physics Department, University of Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
| | - G. Bavdek
- Laboratorio TASC dell'Istituto Nazionale per la Fisica della Materia, Basovizza SS-14, Km 163.5, I-34012 Trieste, Italy, Department of Physics, University of Ljubljana, Ljubljana, Slovenia, Jožef Stefan Institute, Ljubljana, Slovenia, Department of Physics, University of Trieste, Trieste, Italy, INFM unit of Roma Tre and Physics Department, University of Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
| | - L. Floreano
- Laboratorio TASC dell'Istituto Nazionale per la Fisica della Materia, Basovizza SS-14, Km 163.5, I-34012 Trieste, Italy, Department of Physics, University of Ljubljana, Ljubljana, Slovenia, Jožef Stefan Institute, Ljubljana, Slovenia, Department of Physics, University of Trieste, Trieste, Italy, INFM unit of Roma Tre and Physics Department, University of Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
| | - R. Gotter
- Laboratorio TASC dell'Istituto Nazionale per la Fisica della Materia, Basovizza SS-14, Km 163.5, I-34012 Trieste, Italy, Department of Physics, University of Ljubljana, Ljubljana, Slovenia, Jožef Stefan Institute, Ljubljana, Slovenia, Department of Physics, University of Trieste, Trieste, Italy, INFM unit of Roma Tre and Physics Department, University of Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
| | - A. Morgante
- Laboratorio TASC dell'Istituto Nazionale per la Fisica della Materia, Basovizza SS-14, Km 163.5, I-34012 Trieste, Italy, Department of Physics, University of Ljubljana, Ljubljana, Slovenia, Jožef Stefan Institute, Ljubljana, Slovenia, Department of Physics, University of Trieste, Trieste, Italy, INFM unit of Roma Tre and Physics Department, University of Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
| | - F. Evangelista
- Laboratorio TASC dell'Istituto Nazionale per la Fisica della Materia, Basovizza SS-14, Km 163.5, I-34012 Trieste, Italy, Department of Physics, University of Ljubljana, Ljubljana, Slovenia, Jožef Stefan Institute, Ljubljana, Slovenia, Department of Physics, University of Trieste, Trieste, Italy, INFM unit of Roma Tre and Physics Department, University of Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
| | - A. Ruocco
- Laboratorio TASC dell'Istituto Nazionale per la Fisica della Materia, Basovizza SS-14, Km 163.5, I-34012 Trieste, Italy, Department of Physics, University of Ljubljana, Ljubljana, Slovenia, Jožef Stefan Institute, Ljubljana, Slovenia, Department of Physics, University of Trieste, Trieste, Italy, INFM unit of Roma Tre and Physics Department, University of Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
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Bondino F, Vesselli E, Baraldi A, Comelli G, Verdini A, Cossaro A, Floreano L, Morgante A. Molecular orientation of CN adsorbed on Pd(110). J Chem Phys 2003. [DOI: 10.1063/1.1574794] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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