M. Pedio
AREA Science Park
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by M. Pedio.
SYNCHROTRON RADIATION INSTRUMENTATION: Eighth International Conference on Synchrotron Radiation Instrumentation | 2004
Stefano Nannarone; F. Borgatti; A. DeLuisa; B. P. Doyle; G.C. Gazzadi; Angelo Giglia; P. Finetti; Nicola Mahne; Luca Pasquali; M. Pedio; G. Selvaggi; Giampiero Naletto; Maria Guglielmina Pelizzo; G. Tondello
The BEAR (Bending Magnet for Emission Absorption and Reflectivity) beamline is installed at the right exit of the 8.1 bending magnet at ELETTRA. The beamline — in operation since January 2003 — delivers linear and circularly polarized radiation in the 5 – 1600 eV energy range. The experimental station is composed of a UHV chamber for reflectivity, absorption, fluorescence and angle resolved photoemission measurements and a UHV chamber for in‐situ sample preparation.
Surface Science | 1999
M. Pedio; K. Hevesi; N. Zema; M. Capozi; P. Perfetti; R. Gouttebaron; Jean-Jacques Pireaux; R. Caudano; Petra Rudolf
C60 was deposited on Ni(110), Pt(111) and Ag(111) and annealed at different temperatures. The structural properties of the overlayer were investigated by low-energy electron diffraction, the changes induced by adsorption on its electronic properties were studied by valence band and core-level photoemission spectroscopy and inverse photoemission spectroscopy. On all surfaces C60 is chemisorbed and a clear signature for charge transfer is found for C60 on Ni(110) and Ag(111). Decomposition of C60 takes place on Ni(110) and Pt(111) above 690 K and 560 K respectively. The decomposition is a kinetically limited reaction on both surfaces and on Pt(111) we find a very strongly chemisorbed precursor state for decomposition.
Journal of Physical Chemistry Letters | 2012
Federico Grillo; Veronica Mugnaini; Malena Oliveros; Steve M. Francis; Deung-Jang Choi; M. V. Rastei; L. Limot; Cinzia Cepek; M. Pedio; Stefan T. Bromley; Neville V. Richardson; J. P. Bucher; Jaume Veciana
A key stage in engineering molecular functional organizations is represented by controlling the supramolecular assembly of single molecular building blocks, tectons, into ordered networks. Here, we show how an open-shell, propeller-like molecule has been deposited under UHV conditions on Au(111) and its supramolecular organization characterized by scanning tunneling microscopy (STM). Racemic islands were observed at room temperature, and their chirality was imaged at the molecular level at low temperature. Modeling further suggests that the observed chirally alternating ordering dominated by intermolecular interactions is energetically favored. Electron paramagnetic resonance and ultraviolet photoemission spectroscopy evidences suggest that the supramolecular networks may preserve the open-shell character of the tecton. These results represent a fundamental step forward toward the engineering of purely organic spintronic devices.
Journal of Electron Spectroscopy and Related Phenomena | 1995
M. Pedio; M.L. Grilli; C. Ottaviani; M. Capozi; C. Quaresima; P. Perfetti; P.A. Thiry; R. Caudano; Petra Rudolf
The unoccupied states of C60 have been studied for single monolayer and multilayer coverages on Au(110) with Inverse Photoemission Spectroscopy (IPES). In agreement with previous results on C60 on gold, we find that only the first monolayer, which is chemisorbed, shows a different spectrum compared to bulk C60. However, a strong dependence of the π-derived spectral weight on the C60 adsorption site is evident comparing submonolayers and monolayers deposited at different temperatures. The C60 monolayers investigated here present metallic character.
Surface Science | 2000
A. Pesci; L. Ferrari; C. Comicioli; M. Pedio; Cinzia Cepek; P. Schiavuta; M. Pivetta; M. Sancrotti
We characterized the room temperature (RT) growth of C 60 on the Si(111) (7 ×7) surface and the SiC formation upon annealing using high resolution photoelectron spectroscopy techniques. Si 2p core level spectra for RT C 60 deposition unambiguously show the strong attenuation of the rest-atoms components and the growth of at least one new component at I ML coverage. This new component grows with annealing temperature and at T > 1020 K an abrupt change occurs, corresponding to the formation of SiC, as confirmed by the C Is core level emission.
Optical Science and Technology, the SPIE 49th Annual Meeting | 2004
Luca Poletto; Stefano Bonora; M. Pascolini; F. Borgatti; B. P. Doyle; Angelo Giglia; Nicola Mahne; M. Pedio; Stefano Nannarone
Recent measurements of the absolute diffraction efficiency of plane gratings in the conical diffraction mounting (in which the light approaches the grating in the plane parallel to the direction of the grooves) are presented. Three gratings have been tested at the beamline BEAR (Elettra Synchrotron, Trieste) in the 10-130 nm region, showing a peak efficiency as high as 70%. The aim of these measurements is the use of two gratings in the conical diffraction mounting for the realization of a high-throughput time-compensated monochromator for the spectral selection of high-order harmonic radiation produced by the interaction between an ultrashort laser pulse (less than 100 fs) and a gas jet. The monochromatic and ultrashort pulse at the monochromator exit can be used for the injection of a Free Electron Laser. The theory of the time-compensation with gratings will be briefly resumed, the design of the monochromator will be presented, and the results of the measurements at BEAR will be discussed.
Journal of Physical Chemistry Letters | 2015
Veronica Mugnaini; Arrigo Calzolari; Ruslan Ovsyannikov; A. Vollmer; Mathieu Gonidec; Isaac Alcón; Jaume Veciana; M. Pedio
We report on a spectroscopic multitechnique approach to study the metal/radical spinterface formed by a perchlorinated trityl radical derivative and either gold or silver. The spectroscopic fingerprint of their paramagnetic properties could be determined by comparison with their diamagnetic precursor and by DFT calculations. Thanks to the presented approach, we could gain unprecedented insight into the radical-metal interaction and how this latter perturbs the spin polarization and consequently the magnetoelectronic properties of the radical adlayer. Knowledge of the factors influencing the spinterface is an essential tool toward the tailoring of the properties of spin-based electronic devices.
Surface Science | 1997
A. Mascaraque; C. Ottaviani; M. Capozi; M. Pedio; E. G. Michel
The earliest stages of the oxygen interaction with clean and K-covered Si(100) surfaces (8K<0.5 ML) have been investigated using high-resolution core-level photoemission. The sequence of oxidation has been analyzed monitoring the different components of the Si 2p core level. In the case of the clean surface, the contribution coming from the upper dimer atoms is unaffected at the earliest stages of the oxidation. On the contrary, in the presence of K atoms, oxygen reacts rapidly with this type of silicon atoms, and the component is fully depleted after oxygen adsorption. The presence of K atoms induces also the formation of a new oxide component in the Si 2p core level. Its small binding energy shift supports that a fraction of oxygen atoms are bonded at sites modified by the presence of K, forming a K-Si-O complex.
Applied Surface Science | 2001
P. Moras; N. Mahne; L. Ferrari; A. Pesci; M. Capozi; L. Aversa; S.N. Jha; R. Verucchi; S. Iannotta; M. Pedio
Fullerene (C60) was deposited on Si(1 0 0) 2 � 1 double domain reconstructed substrate. The interface has been treated with annealing procedure in order to fragment the C60 precursor and to induce covalent Si-C bond formation and to obtain carbidization. In this way SiC(1 0 0) films of thousands of Ahave been grown. Depending on the growth procedure different surface structures, 1 � 1o r 2� 1, have been obtained. The different stages of growth has been checked by in situ low energy electron diffraction (LEED), and Auger spectroscopy. Ex situ we verified surface order by means of LEED technique, observing either a 1 � 1o r a2 � 1 double domain reconstruction. We characterized electronic properties collecting valence band and core level spectra employing synchrotron radiation source. Valence band spectra showed evident electronic surface states similar to those revealed on SiC(1 0 0) surfaces grown by different techniques. # 2001 Published by Elsevier Science B.V.
New Journal of Physics | 2009
Roberto Macovez; M. R. C. Hunt; Junjun Shan; A. Goldoni; T. Pichler; M. Pedio; Paolo Moras; Carla Castellarin-Cudia; Joachim Schiessling; Luc Venema; Petra Rudolf
We present an electron spectroscopy study of phase-pure AC(60) thin films (A = Rb, Cs) in their monomer (face-centred cubic (fcc)) and polymer phases. A surface electronic reconstruction is observed in polymeric RbC60, analogous to that reported for the fcc phase. As for pristine C-60, the occupied electronic states of AC(60) fullerides are not dramatically affected by polymerization. The energy separation between the leading feature in photoemission and inverse photoemission is similar in both stable AC(60) phases. These observations suggest that electron correlation effects are similar in the two phases, and that their different electronic behaviour is mainly related to the reduction of degeneracy of the polymer frontier states. Photoemission and electron-energy loss spectroscopy data show that the thin-film form of the RbC60 polymer is metallic at room temperature, and that it undergoes a metal-insulator transition at around 100 K. This transition temperature is much higher than that reported for the corresponding bulk phase and signals a poorer screening of Coulomb interactions at the film surface.