Distorted waves Emission spectroscopy 10 Grazing incidence 10 Photo-electron emission 10 Ultrashort pulses 10 Eikonal 8 Metal surfaces 8 Numerical solution 8 Band structure 6 Ionization 6 Photoelectron spectroscopy 6 Photoelectrons 6 Photons 6 Projectiles 6 Atomic ionization 4 Atoms 4 Band-structure-based models 4 Born approximation 4 Condensed matter physics 4 Diffraction 4 Dinger equation 4 Eikonal approximations 4 Electron emission 4 Emitted electron 4 First Born approximation 4 Helium 4 Nonlinear equations 4 Protons 4 Schrodinger equation 4 Structure-based 4