Ionization 20 Atomic ionization 16 Laser pulses 12 Atoms 10 Short laser pulse 8 Atomic ionizations 6 Atomic physics 6 Electron emission 6 Hydrogen 6 Momentum distributions 6 Above-threshold ionization 4 Angular distribution 4 Angular momentum 4 Angular momentum distribution 4 Approximation theory 4 Atom lasers 4 Carrier-envelope phase 4 Differential equations 4 Dinger equation 4 Distorted waves 4 Hydrogen atoms 4 Image segmentation 4 Initial state 4 Integrodifferential equations 4 Ionization amplitude 4 Laser beams 4 Lasers 4 Momentum 4 Numerical solution 4 Photoelectron spectroscopy 4