Continuum distorted waves Distortion (waves) 10 Ionization 10 Atoms 6 Born approximation 6 Eikonal 6 Impact ionization 6 Ionization cross section 6 Krypton 6 Neon 6 Xenon 6 Angular expansions 4 Coarse-grained structure 4 First Born approximation 4 First Born approximations 4 Harmonic analysis 4 Helium 4 High energy physics 4 Intracycle interferences 4 Ions 4 Numerical evaluations 4 Photoelectron spectroscopy 4 Photoelectrons 4 Photons 4 Polarization 4 Proton impacts 4 Protons 4 Radial functions 4 Spherical harmonics 4 Strong-field approximations 4