Surface scattering Ab initio Atoms Band structure Band structure effects Calculations Condensed matter physics Crystallographic directions DFT potential Density functional theory Diffraction Dissipative effects Distorted waves Eikonal approximations Electron emission Electron emission spectra Electronic excitation Emission spectroscopy Energy dissipation Energy loss distributions Energy-loss spectrum Experimental conditions Fast atom diffractions Grazing incidence Grazing scattering Helium Helium atom Inelastic contributions Interaction potentials Laser pulses