English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/102751
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Quantum ricochets: surface capture, release and energy loss of fast ions hitting a polar surface at grazing incidence

AutorLucas, A. A.; Šunjić, Marijan; Benedek, G.; Echenique, Pedro M.
Fecha de publicación2014
EditorInstitute of Physics Publishing
CitaciónNew Journal of Physics 16: 063015 (2014)
ResumenA diffraction mechanism is proposed for the capture, multiple bouncing and final escape of a fast ion (keV) impinging on the surface of a polarizable material at grazing incidence. Capture and escape are effected by elastic quantum diffraction consisting of the exchange of a parallel surface wave vector G = 2π/a between the ion parallel momentum and the surface periodic potential of period a. Diffraction-assisted capture becomes possible for glancing angles Φ smaller than a critical value given by Φ c2 ≈ 2λ/a-|V im|/E, where E is the kinetic energy of the ion, λ = h/Mv its de Broglie wavelength and V im its average electronic image potential at the distance from the surface where diffraction takes place. For Φ < Φ c, the ion can fall into a selected capture state in the quasi-continuous spectrum of its image potential and execute one or several ricochets before being released by the time reversed diffraction process. The capture, ricochet and escape are accompanied by a large, periodic energy loss of several tens of eV in the forward motion caused by the coherent emission of a giant number of quanta ω of Fuchs-Kliewer surface phonons characteristic of the polar material. An analytical calculation of the energy loss spectrum, based on the proposed diffraction process and using a model ion-phonon coupling developed earlier (Lucas et al 2013 J. Phys.: Condens. Matter 25 355009), is presented, which fully explains the experimental spectrum of Villette et al (2000 Phys. Rev. Lett. 85 3137) for Ne+ ions ricocheting on a LiF(001) surface. © 2014 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
DescripciónContent from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
Versión del editorhttp://dx.doi.org/10.1088/1367-2630/16/6/063015
Identificadoresdoi: 10.1088/1367-2630/16/6/063015
issn: 1367-2630
Aparece en las colecciones: (CFM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Quantum ricochets.pdf1,53 MBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.