A5000370353- Advanced Chemical Physics Studies
- Electron and X-Ray Spectroscopy Techniques
- Surface and Thin Film Phenomena
- Catalytic Processes in Materials Science
- X-ray Spectroscopy and Fluorescence Analysis
- Semiconductor materials and devices
- Graphene research and applications
- Advanced X-ray Imaging Techniques
- Nuclear Physics and Applications
- Cultural Heritage Materials Analysis
- Photonic Crystal and Fiber Optics
- Carbon Nanotubes in Composites
- Catalysis and Oxidation Reactions
- nanoparticles nucleation surface interactions
- Diamond and Carbon-based Materials Research
- Liquid Crystal Research Advancements
- Image Processing and 3D Reconstruction
- Advanced Fiber Laser Technologies
- Quasicrystal Structures and Properties
- Copper-based nanomaterials and applications
- Molecular Junctions and Nanostructures
- Laser Material Processing Techniques
- X-ray Diffraction in Crystallography
- Glass properties and applications
- Chemical and Physical Properties of Materials
University of Calabria
2011-2024
Istituto Nanoscienze
2018-2024
Istituto di Nanotecnologia
2016-2024
National Research Council
2022-2023
National Interuniversity Consortium for the Physical Sciences of Matter
2006-2022
Institute of Crystallography
2008-2011
Istituto Nazionale per la Fisica della Materia
1993-2006
University of Vienna
2003
European Science Foundation
1997-2002
European Synchrotron Radiation Facility
1995-2000
The dispersion and the damping of sheet plasmon in a graphene monolayer grown on Pt(111) have been studied by using angle-resolved electron energy loss spectroscopy. We found that relation mode confined is linear, as consequence screening metal substrate. Present results demonstrate presence an underlying substrate could striking consequences propagation even case system which exhibits weak graphene-substrate interaction. Moreover, we Landau essentially occurs via interband excitations...
The cold neutron imaging and diffraction instrument IMAT at the second target station of pulsed source ISIS is currently being commissioned prepared for user operation. will enable white-beam radiography tomography. One benefits operating on a to determine energy via time flight measurement, thus enabling energy-selective energy-dispersive imaging, maximizing image contrasts between given materials mapping structure microstructure properties. We survey hardware software components data...
Studying the interaction of CH3SH, methanethiol, with Cu(111) as a model system, we demonstrate ability chemical-shift normal incidence x-ray standing wave field measurements to identify local adsorption geometries coadsorbed reaction products at different temperatures, technical problem broad chemical significance. In present case four distinct S-containing adsorbate species (intact two thiolate (CH3S-) intermediates and atomic S) are determined.
Kidney collecting-duct cells swell in response to changes medulla osmolality caused by the transition from antidiuresis diuresis. Regulatory volume decrease (RVD) mechanisms must be activated face this hypotonic stress. In Aquaporin-2 (AQP2)-expressing renal CD8 cells, hypotonicity decreased cell surface expression of AQP2 and increased amount localized intracellularly, whereas total phosphorylated at ser-256 decreased. Analysis cAMP dynamics using fluorescence resonance energy transfer...
Abstract A collection of more than 1800 carbonized papyri, discovered in the Roman ‘Villa dei Papiri’ at Herculaneum is unique classical library survived from antiquity. These papyri were charred during 79 A.D. Vesuvius eruption, a circumstance which providentially preserved them until now. This magnificent contains an impressive amount treatises by Greek philosophers and, especially, Philodemus Gadara, Epicurean thinker 1st century BC. We read many portions text hidden inside using enhanced...
Abstract X-ray phase-contrast coupled to high-spatial resolution imaging systems provides a high sensitivity for distinguishing soft tissue structures in small samples, thus being suited virtual histology. Propagation-based tomography can deliver considerable gain signal-to-noise ratio (SNR) at pixel sizes when it is combined suitable phase retrieval filter. We optimized acquisition parameters, namely the propagation distance and size, with aim of providing adequate spatial histology breast...
Water interaction with quasi-freestanding graphene deposited on Pt(111) has been investigated by using vibrational spectroscopy. Loss measurements show that water molecules dosed at room temperature can dissociate giving rise to C-H bonds. The formation of the bonds strongly attenuates optical phonons sheet. On other hand, 100 K found adsorb only in molecular state. Present findings should be taken into account engineering graphene-based devices which work atmospheric pressure and temperature.
Atoms ionization by the simultaneous absorption of multiple photons has found applications in fiber optics, where it leads to unique nonlinear phenomena. To date, studies regime have been limited gas-filled hollow-core fibers. Here, we investigate multiphoton standard optical fibers, intense laser pulses ionize atoms constituting structure itself, instead that filling gas. We characterize material modifications produced breakdown. Their formation affects beam dynamics over hours long...
The nature and the dispersion of electronic collective excitations in ultrathin Ag layers deposited onto Cu(111) surface were investigated by angle-resolved high-resolution electron-energy-loss spectroscopy. For two we found a nearly flat behavior surface-plasmon energy (absence dispersion) as function parallel momentum transfer. higher coverages plasmon is confined grains. confinement was removed upon annealing. On contrary, on sputtered film quadratic term dominates.
The electronic response of quasi-freestanding graphene on Pt(111) has been measured by high-resolution electron energy loss spectroscopy. Loss spectra reveal the existence three distinct excitations: a dispersing feature due to ordinary sheet plasmon and two dispersionless modes at 0.2 0.5–0.6 eV. latter features are assigned coupled plasmon–phonon excitation an interface plasmon, respectively. complex interactions plasmons with other particles have significant fundamental practical...
In situ synchrotron radiation measurements of porous silicon (PS) strain have been performed during ultrahigh vacuum (UHV) thermal annealing. For a p+ sample, the initial lattice expansion shifts toward contraction above 270 °C in relation with hydrogen desorption. p− variation is similar to that one, but effects five times larger: after desorption, large (>1.5%) and inhomogeneous. both cases, most these strains are elastic as an HF etch re-establishes narrow diffraction peak....
We have measured the collective electronic excitations of Al(111) surface by means angle-resolved high-resolution electron-energy-loss spectroscopy. Loss spectra reveal both monopole and multipole plasmons. The dispersion plasmon is negative, as predicted calculations dynamic response electron at a free-electron-like sample. aluminum plasmon, which was not detected in previous investigations, clearly observed present spectra.
High-resolution electron energy loss spectroscopy was used to investigate the low-energy collective excitations of $\mathrm{Cu}(111)$ surface. Measurements showed a mode with an $1.1\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. The measured dispersion plasmon negative. We suggest that this arises from oscillation electrons confined surface within quasi-two-dimensional Shockley states. Moreover, we show acousticlike theoretically proposed for (111) noble metals is not observed in copper. behavior...
The electronic structure of cluster assembled nanostructured TiO(2) thin films has been investigated by resonant photoemission experiments with photon energies across the Ti L(2,3) edge. samples were produced supersonic beam deposition a pulsed microplasma source. valence band shows resonance enhancements in binding energy region between 4 and 8 eV, populated O 2p hybridized 3d states, about 1 eV below Fermi level associated defects related states. data show that as-deposited atoms are...
Abstract Surface plasmon dispersion in nanoscale thin Ag films deposited onto the Ni(111) surface was investigated by angle‐resolved electron energy loss spectroscopy. We found that curve contains only quadratic term. The vanishing of linear term ascribed to presence film 5sp‐related quantum well states. Screening effects enhanced confinement states push position centroid induced charge less inside interface compared other systems, rendering null coefficient curve. (© 2008 WILEY‐VCH Verlag...
Collective electronic excitations occurring in Na layers grown on Cu(111) and H2O∕Na∕Cu(111) have been investigated at room temperature by high resolution electron energy loss spectroscopy. Loss spectra taken for a coverage between 0.55 0.70 ML of are characterized feature 3.0eV assigned to Mie resonance. Further increasing the leads appearance surface plasmon 3.9eV. Water molecules dissociate as shown OH–Na vibration. Upon water adsorption, relevant effects both vibrational modes were...