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dc.contributor.authorGrande, Pedro Luispt_BR
dc.contributor.authorVos, Maartenpt_BR
dc.date.accessioned2014-10-15T02:12:36Zpt_BR
dc.date.issued2013pt_BR
dc.identifier.issn1050-2947pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/104557pt_BR
dc.description.abstractThe energy loss of fast ions at close collision is mainly due to electron-ion collisions. The electrons are approximately stationary and they collidewith a fast-moving ion. Herewe study the same collision experimentally, in a reference system where the ions (or atoms) are stationary and interacting with keV electrons. Scattering cross sections under these conditions deviate from Rutherford, and we link these deviations, at higher energies, to the Z3 contributions to the electronic stopping and the related Barkas effect and, at lower energies, also to quantum interference. The present measurements are well described by partial-wave calculations of the elastic cross section of electrons scattering from atoms. Encouraged by this agreement we use these calculations to estimate the Barkas factor for all elements and many energies. A universal curve for the Barkas factor due to close collisions is obtained for neutral projectiles and similar curves with smaller magnitude are found for ions.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofPhysical review. A, Atomic, molecular, and optical physics. New York. Vol. 88, no. 5 (Nov. 2013), 052901, 9 p.pt_BR
dc.rightsOpen Accessen
dc.subjectPerda de energia de particulaspt_BR
dc.subjectQuímica quânticapt_BR
dc.subjectInterferencia quanticapt_BR
dc.titleExploring the Barkas effect with keV-electron scatteringpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000909023pt_BR
dc.type.originEstrangeiropt_BR


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