Theory of elastic scattering of atoms by a hard corrugated surface with an attractive potential

An exact quantum-mechanical theory for the elastic scattering of atoms by a hard corrugated surface incorporating a stationary attractive potential is presented. The numerical procedure used gives a convergent solution, and our calculations were accurate to ±{}10^-3 in the diffraction intensities. Application is made to the He-Cu(117) system, and new conclusions are drawn on the overall pattern of resonance structure in atoms scattering from a stepped surface.