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The scattering of helium atoms from growing metal. surfaces is dominated by the interaction between incident atoms and isolated surface steps. Understanding the process has been constrained by the lack of both a realistic interaction potential and a satisfactory method for treating the scattering from a defect, which, because of the height difference of the adjoining terraces, extends to infinity. We have calculated step scattering cross sections for Cu(001) surface. The calculations make use of realistic potentials that reproduce the scattering from low index planes and are created from non-spherical, pairwise repulsive and attractive terms. The step scattering is isolated from that of adjoining terraces using the linearity of summation of scattering amplitudes in the single scattering regime. The results for equivalent step and terrace-site potentials give a total cross section significantly less than the experimental value. The total cross section increases with helium beam energy, contrary to the expectations that it is dominated by scattering from the attractive part of the potential. The present work confirms the prediction of our previous study that not the Van der Waals interaction but the hard wall of the scattering potential dominates the step scattering. Key words: Energy dependence; Scattering; Helium atoms; Atomic steps DOI: 10.3329/jbas.v34i1.5489 Journal of Bangladesh Academy of Sciences , Vol.34, No.1, 23-31, 2010

Energy Dependence of Total Cross Section for Scattering of Helium Atoms from Isolated Atomic Steps