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The Kondo effect may be observable in some atom-surface scatteringexperiments, in particular, those involving alkaline-earth atoms. By combiningKeldysh techniques with the NCA approximation to solve the time-dependentNewns-Anderson Hamiltonian in the infinite-U limit, Shao, Nordlander andLangreth found an anomalously strong surface-temperature dependence of theoutgoing charge state fractions. Here we employ the dynamical 1/N expansionwith finite Coulomb interaction U to provide a more realistic description ofthe scattering process. We test the accuracy of the 1/N expansion in thespinless N = 1 case against the exact independent-particle solution. We thencompare results obtained in the infinite-U limit with the NCA approximation andrecover qualitative features found previously. Finally, we analyze therealistic situation of Ca atoms with U = 5.8 eV scattered off Cu(001) surfaces.Although the presence of the doubly-ionized Ca species can change the absolutescattered positive Ca yields, the temperature dependence is qualitatively thesame as that found in the infinite-U limit. One of the main difficulties thatexperimentalists face in attempting to detect this effect is that the atomicvelocity must be kept small enough to reduce possible kinematic smearing of themetal's Fermi surface.Comment: 15 pages, 10 Postscript figures; references and typos correcte

physical review. b, condensed matter

Room-temperature Kondo effect in atom-surface scattering: Dynamical<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mi>N</mml:mi></mml:math>approach

Room-temperature Kondo effect in atom-surface scattering: Dynamical1/Napproach