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Research

 

The group scientific activity is principally devoted to the study of electronic and magnetic properties of a large variety of solid materials ranging from  superconductors to organic and inorganic molecular adsorbates, ultra-thin oxide films and surface alloys.
We are interested in the chemical and electronic properties, in the surface reactivity, surface structure and dynamical processes.
To this purpose, we use the wide range of techniques, all available at the same ultra-high-vacuum endstation A: X-ray Photoelectron Spectroscopy (including Angle-Resolved Photoelectron Spectroscopy and XPD), X-Ray Emission,  X-Ray Magnetic Circular Dichroism (in remanence), Low Energy Electron Diffraction, Molecular and Electron Beam Epitaxy.
Morover recently we Time-resolved X-Ray Absorption in the sub-nsec regime has been developed.
Research applications are targeted to surface and materials sciences, physics and chemistry, but the same x-ray spectroscopy techniques can be used and has been used also to address topics of geochemistry, mineralogy, medical science, environmental science, bio-chemistry, astrophysics...

Browse our Publications

Read our Highlights


Some of the funded projects/proposals

FIRB-Futuro in Ricerca

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Beyond graphene (Full list of publications)
Publications funded by FIRB performed at the BACH beamline by the IOM-CNR BACH research unit
NOTE: Reseach on graphene at BACH is also supported by MIUR through the program `Progetto Premiale 2012' - Project ABNANOTECH

Project funded by MIUR
F. Bondino (local coordinator), S. NappiniE. Magnano IOM-CNR
L. Savio (local coordinator)- IMEM-CNR
S. Agnoli (local coordinator)-Università di Padova
C. Di Valentin (national coordinator)- Università di Milano Bicocca

Read more...

 

IOM Start up

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Determining the Density of electronic states of DNA - D3
 
 
Elena Magnano (coordinator), Silvia Nappini, Federica Bondino  Sede TS-TASC – Beamline BACH.
Paolo Umari, Stefano Baroni, Alessandra Magistrato  Sede TS-DEMOCRITOS
Marco Lazzarino, Gianluca Grenci Sede TS-TASC
Read more...


Progetti in kind (PIK)

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EX-PRO-REL: EXcitation PROcesses and RELaxation in

condensed matter and nanostructures: methodological,

instrumental, and scientific challenges

Coordinator: Federico Boscherini (Università di Bologna)
Partecipants: E. Magnano, F. Bondino
Read more...

PRIN 2012

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More information soon

Coordinator: M. Casarin (Università di Padova)
Local Coordinator: S. Pagliara (Università Cattolica di Brescia)
Partecipants: E. Magnano
Read more...


 

A multi-technique approach for the study of solid samples and surfaces

X-ray emission spectroscopy

X-ray emission spectroscopy (XES) provides a means of probing the partial occupied density of electronic states of a material. XES is element-specific and site-specific, making it a powerful tool for determining detailed electronic properties of materials. Emission spectroscopy can take the form of either resonant inelastic X-ray emission spectroscopy (RIXS) or non-resonant X-ray emission spectroscopy (NXES). Both spectroscopies involve the photonic promotion of a core level electron, and the measurement of the fluorescence that occurs as the electron relaxes into a lower-energy state.

X-ray Photoelectron Spectroscopy

X-ray Photoelectron Spectroscopy (XPS) is a quantitative spectroscopic technique that measures the elemental composition, chemical state and electronic state of the elements within a material. XPS spectra are obtained by irradiating a material with a beam of X-rays while simultaneously measuring the kinetic energy and number of electrons that escape from the top layers of the material being analyzed. XPS  can be used to analyze the surface chemistry of a material in its "as received" state, or after some treatment, for example: fracturing, cutting or scraping in UHV to expose the bulk chemistry, ion beam etching to clean off some of the surface contamination, exposure to heat to study the changes due to heating, exposure to reactive gases. Temperature-programmed fast XPS measurements can be performed.


X-Ray Absorption Spectroscopy

Soft-X-ray absorption spectroscopy (XAS) is technique for determining the local electronic structure of matter. XAS data are obtained by tuning the photon energy to a range where core electrons can be excited. Polarization-dependent XAS measuremnts can be performed.

Time-resolved Pump-Probe X-Ray Absorption Spectroscopy

Time-resolved x-ray absorption spectroscopy is the study of dynamic processes in materials or chemical compounds by means of x-ray abspectroscopic techniques. With the help of pulsed lasers, it is possible to study processes that occur on time scales in the sub-nanosec range.


Angle-resolved photoemission spectroscopy

Angle-resolved photoemission spectroscopy (ARPES) is an experimental technique to observe the distribution of the density of single-particle electronic excitations in the reciprocal space of solids.

ARPES gives information on the direction, speed and scattering process of valence electrons in the sample being studied (usually a solid). This means that information can be gained on both the energy and momentum of an electron, resulting in detailed information on band dispersion and Fermi surface. Both VUV ARPES and SOFT X-RAY ARPES can be performed.

X-ray magnetic circular dichroism

X-ray magnetic circular dichroism (XMCD) is a difference spectrum of two x-ray absorption spectra (XAS) taken in a magnetic field, one taken with left circularly polarized light, and one with right circularly polarized light. By closely analyzing the difference in the XMCD spectrum, information can be obtained on the magnetic properties of the atom, such as its spin and orbital magnetic moment. 



Photoelectron Diffraction

When a radiation field excites an atomic core-level,  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 other components scattered coherently (in space and time) from neighbor atoms produces a Photoelectron Diffraction (PhD, PED or XPD) pattern that is characteristic for each emitter site.

LEED

Since the formation of the first electron diffraction patterns in 1927 by Davisson and Germer, who explained the physical phenomenon in terms of wave nature of electrons, Low Energy Electron Diffraction has been widely used for surface crystallography studies. LEED is not only a powerful tool for the qualitative identification of surface symmetries and two-dimensional periodicities, but it is the most used technique for quantitative structure determination of ordered surfaces.




Thesis students at BACH

Thesis partly* on entirely** based on work/experiments at the BACH beamline

PhD 2002
  • Marco Zangrando** - Czech Technical University (Prague, CZ)
    Soft x-ray optics and soft x-ray spectrometer for a circularly polarised radiation source at Elettra
    2004
  •  
    • Sandrine Brice-Profeta* - Universite´ Pierre et Marie Curie (UPMC), (Paris, F)
      E´tude de l'ordre chimique et magne´tique d'oxydes spinelles de taille nanome´trique par dichroisme magne´tique circulaire des rayons X

       

  • 2005
  •  
    • Karsten Kuepper* - Universitaet Osnabrueck (Osnabrueck, D)
      Electronic and magnetic properties of transition metal compounds: An x-ray spectroscopic study

       

  • 2009
  •  
    • Emanuela Carleschi** - Università degli Studi di Trieste (Trieste, I)
      Studio di sistemi a forte correlazione elettronica mediante tecniche di spettroscopia elettronica

       

  • 2010
  •  
    • Claire Mathieu* - Universitè Pierre et Marie Curie (UPMC), (Paris, F)
      Approche inte´gre´e « Spectroscopies e´lectroniques et Calculs Ab-initio d'e´tats de coeur excite´s » des modes d'adsorption de l'ammoniac et de diamines sur la surface Si(001)-2x1.

       

Laurea (M.Sc.)
    2003
  •  
    • Mauro Platè** - Università degli Studi di Pavia (I)
      Studio delle proprietà magnetiche ed elettroniche in film di La1-xNaxMnO3 (x=0, 0.08, 0.15) con assorbimento dicroico e emissione risonante di raggi x
      Study of the magnetic and electronic properties in La1-xNaxMnO3 (x=0, 0.08, 0.15) films by means of x-ray dichroic absorption and resonant emission
  • 2004
  •  
    • Emanuela Carleschi** - Università Cattolica del Sacro Cuore Brescia (I)
      Studio della struttura elettronica del sistema URu2Si2 mediante spettroscopia di fotoemissione risolta in angolo ad alta risoluzione
      Study of the electronic structure of URu2Si2 system by means of high resolution angle resolved photoemission spectroscopy
  • 2005
  •  
    • Alessandro Nicolaou** - Università degli Studi di Milano (I)
      Studio strutturale del monosiliciuro di manganese cresciuto su Si(111)
      Strucutral study of the managnese monosilicide grown on Si(111)

Laurea triennale (B.Sc.)

    2005
  •  
    • Daniele Novello** - Università degli Studi di Trieste (I)
      Proprietà magnetiche di nanostrutture ordinate
      Magnetic properties of ordered nano-structures
  • 2006
  •  
    • Sarah Bassi** - Università degli Studi di Trieste (I)
      Contributo allo studio della struttura elettronica del MnSi
      Contribution to the study of the MnSi electronic structure
    • Stefano Savi** - Università degli Studi di Trieste (I) Studio della deposizione e della struttura elettronica dell'interfaccia Mn-Ge Study of deposition and electronic structure of Mn-Ge interface
    • Alberto Crepaldi** - Universià degli Studi di Trieste (I)
      Misura della superficie di Fermi di ossidi misti di cobalto mediante tecnica di fotoemissione elettronica risolta in angolo
      Determination of the Fermi surface of mixed cobalt oxides by means of angle resolved photoemission

  • 2007
  •  
    • Alessandro Tuniz** - Università degli Studi di Trieste (I)
      Misure di fotoemissione elettronica risonante su cristalli di cobaltite [Bi2Ba2O4]RS [CoO2]2
      Resonant photoemission measurements on cobaltite crystals [Bi2Ba2O4]RS [CoO2]2
Ultima modifica il Lunedì, 22 Ottobre 2018 09:58