Elettra-Sincrotrone Trieste S.C.p.A. website uses technical, analytics and third party cookies, in order to collect anonymous statistical informations.
Website navigation do not affect users' privacy during their browsing experience on our website, as they do not entail processing their personal identification data.
Session cookies are not permanently stored and indeed are cancelled when the browser has quit.
The technical cookies also improve or customise the browsing experience and are necessary to the website provided by Elettra - Sincrotrone Trieste S.C.p.A. to function properly.
More info
OK
Research
|
The group activity is focused in determining the geometrical and electronic structure of a large variety of solid surfaces, ranging from clean and adsorbate covered transition metals, ultra-thin Oxide Films, and Surface Alloys to Epitaxial Graphene and 2D-materials and Size-Selected Nanoclusters. The experimental team routinely participates in experiments performed at the Elettra beamlines, in particular at the SuperESCA. The experiments are often complemented by density functional theory calculations performed by external groups, in particular at University College London-UK, King's College London-UK, and University of Basque Country.
We are interested in understading physical and chemical properties of materials at the nanoscale. We would like to determine how adsorbates interact on the surface, how they modify the substrate, how the formation of bonds influences the electronic structure of the systems, and what are the elementary steps in simple surface processes (atomic and molecular diffusion, subsurface penetration, surface segregation, chemical reactions). To this purpose, we use an ultra-high-vacuum chamber equipped with instrumentations for Low Energy Electron Diffraction, X-ray Photoelectron Spectroscopy, X-ray Photoelectron Diffraction and Temperature Programmed Desorption experiments. We have developed ENAC (Exat Number of Atoms in each Cluster), the source that can produce size-selected clusters, that in combination with the synchrotron light available at the SuperESCA beamline allows to investigate the properties of matter composed by just few atoms.
|
|
Low Energy Electron Diffraction
|
X-ray Photoelectron Diffraction
 |
X-ray Photoelectron Diffraction is a crystallographic technique that successfully combines chemical, structural and surface sensitivity. A radiation field excites an atomic core-level, and the outgoing electron goes through a scattering process with the surrounding atoms. The quantum-mechanical interference of the directly emitted component of the photo-ejected electron wave-field with the other components, coherently scattered from neighbor atoms, produces a diffraction pattern that is characteristic for each emitter.
|
|
Temperature Programmed Desorption
 |
Temperature Programmed Desorption is one of the most straightforward surface science experimental tools which provides information on the binding energy of the bound surface species. While increasing the sample temperature with a linear ramp in time it is possible to monitor one or more desorbing species with a mass spectrometer. The desorption temperature, the shape of the desorption peak, and how all these change with initial surface coverage and heating rate can be analyzed to provide information about the adsorbate/substrate interaction.
|
|
X-ray Photoelectron Spectroscopy
 |
X-Ray Photoelectron Spectroscopy is based on the photoelectric effect, which was first discovered by Albert Einstein in 1905. The photoemission process from a solid sample takes place when a highly energetic photon interacts with matter, causing an electron to be removed from an atomic orbital or from a band and to reach the vacuum level. The excitation energy must be large enough for the electrons to overcome the work function of the solid.
|
|
Last Updated on Saturday, 19 October 2024 19:23
