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Surface Physics Research at the Centro Atómico Bariloche (since 1987 to 2001) People Dr. Hugo Ascolani Dr. Oscar Grizzi Dr. Esteban A. Sánchez Dr. Guillermo.

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Presentation on theme: "Surface Physics Research at the Centro Atómico Bariloche (since 1987 to 2001) People Dr. Hugo Ascolani Dr. Oscar Grizzi Dr. Esteban A. Sánchez Dr. Guillermo."— Presentation transcript:

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2 Surface Physics Research at the Centro Atómico Bariloche (since 1987 to 2001) People Dr. Hugo Ascolani Dr. Oscar Grizzi Dr. Esteban A. Sánchez Dr. Guillermo Zampieri Dra. María L. Martiarena Dr. Víctor H. Ponce Dr. Julio E. Gayone (postdoc) Lic. Silvina Bengió (PhD student) Lic. L. De Ferrariis (PhD student) Gonzalo Otero (student) Publications: 60 in international journals (since 1996) Invited talks: 10 (since 1996) PhD thesis: 8 (since 1987) Budget: $250,000 (since 1996)

3 Intrinsic properties of materials Characterization of surfaces by ion scattering Characterization of surfaces by photoemission Electronic properties of perovskites Characterization of hard amorphous carbon films. Interaction of electrons and ions with surfaces. Excitation of phonons in medium-energy electron spectroscopies. Inelastic processes in ion- surface collisions Modifications of surfaces by ion bombardment Surface Characterization by TOF-ISS G. Otero, J.E. Gayone, E.A. Sánchez, O. Grizzi Collaboration with Surface Physics Group of Santa Fe (INTEC) - Argentina Surface Reconstruction Adsorption Kinetics Adsorption sites Thin film growth Charge exchange

4 Intrinsic properties of materials Characterization of surfaces by ion scattering Characterization of surfaces by photoemission Electronic properties of perovskites Characterization of hard amorphous carbon films. Interaction of electrons and ions with surfaces. Excitation of phonons in medium-energy electron spectroscopies. Inelastic processes in ion- surface collisions Modifications of surfaces by ion bombardment Atom and molecule adsorption on semiconductor surfaces Silvina Bengió and Hugo Ascolani Collaboration: M.C. Asensio, spanish-french beam-line at LURE, Orsay, France. Photoemission and syncrhotron radiation Estructural properties: Photoelectron diffraction Chemical and electronic properties: XPS and ARUPS Adsorption site of the OH radicals in the H 2 O/Si(100) system. Electronic Structure of Ga/Si(111). Order-disorder phase transition of the Sn/Ge(111) system. Photoelectron diffraction Adsorption of H 2 O on Si(100)

5 Intrinsic properties of materials Characterization of surfaces by ion scattering Characterization of surfaces by photoemission Electronic properties of perovskites Characterization of hard amorphous carbon films. Interaction of electrons and ions with surfaces. Excitation of phonons in medium-energy electron spectroscopies. Inelastic processes in ion- surface collisions Modifications of surfaces by ion bombardment Electronic Structure of Transition-Metal Perovskites. G. Zampieri, J.E. Gayone. Collaboration: Dr M. Abbate, Laboratorio Nacional de Luz Sincrotron, Campinas, (Brazil) CAB-Bariloche, Argentina Studied Systems: Sr 2 FeMoO 6, LaNiO 3-x (0

6 Intrinsic properties of materials Characterization of surfaces by ion scattering Characterization of surfaces by photoemission Electronic properties of perovskites Characterization of hard amorphous carbon films. Interaction of electrons and ions with surfaces. Excitation of phonons in medium-energy electron spectroscopies. Inelastic processes in ion- surface collisions Modifications of surfaces by ion bombardment Excitation of Phonons in Medium-Energy Electron Spectroscopies. H. Ascolani, G. Zampieri, J.E. Gayone. Collaboration: Dr. Ph. Hofmann, Institute for Storage Ring Facilities, University of Aarhus, Aarhus, Denmark Experimental and theoretical study of the excitation/absorption of phonons in: LEED-MEED Valence-band photoemission. Valence Band Photoemission from Al(100) LEED MEED LEED-MEED Transition The angular pattern changes as the wave vector conservation rules are gradually relaxed by the excitation/absorption of phonons.

7 Intrinsic properties of materials Characterization of surfaces by ion scattering Characterization of surfaces by photoemission Electronic properties of perovskites Characterization of hard amorphous carbon films. Interaction of electrons and ions with surfaces. Excitation of phonons in medium-energy electron spectroscopies. Inelastic processes in ion-surface collisions Modifications of surfaces by ion bombardment Electron emission in grazing ion-surface collisions E.A. Sánchez, O. Grizzi and G. Otero Collaboration with LCAM-Orsay, France Effect of surface induced- and track- potentials Inelastic processes: Convoy electrons Auger electron emission Projectile autoionization Plasmon excitation and decay. Effect of the surface topography

8 Intrinsic properties of materials Characterization of surfaces by ion scattering Characterization of surfaces by photoemission Electronic properties of perovskites Characterization of hard amorphous carbon films. Interaction of electrons and ions with surfaces. Excitation of phonons in medium-energy electron spectroscopies. Inelastic processes in ion-surface collisions Modifications of surfaces by ion bombardment Theoretical studies of electron emission in grazing ion- surface collisions M.L. Martiarena and V.H.Ponce. Surface ionization by ion impact Binary - electron production Convoy electron emission Continuum wave of an hydrogen atom in front of metallic surfaces (y,z) 2 k,m=0

9 Intrinsic properties of materials Characterization of surfaces by ion scattering Characterization of surfaces by photoemission Electronic properties of perovskites Characterization of hard amorphous carbon films. Interaction of electrons and ions with surfaces. Excitation of phonons in medium-energy electron spectroscopies. Inelastic processes in ion- surface collisions Modifications of surfaces by ion bombardment Modification of surfaces by ion bombardment E.A. Sánchez and G. Otero Collaboration with CAB-Bariloche, Argentina Roughening of flat semiconductor surfaces by Blistering and Sputtering Swelling Flattening of rough metal surfaces by Sputtering Phase transformation in alloys 6.5 dpa (3 x ions/cm 2 ), 30 keV Ar Cu-Zn-Al(100) Mechanically polished After grazing bombardment


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