Fully differential cross sections 10 Helium 10 Ionization 8 Projectile target interaction 8 Sturmian functions 8 Projectiles 6 Double ionization 4 First Born approximation 4 Impact ionization 4 Perturbative treatment 4 Three-body problem 4 Ab initio calculations 2 Asymptotic behaviors 2 Atomic physics 2 Atoms 2 Calculations 2 Collision problem 2 Continuum problem 2 Convergent close coupling methods 2 Convergent close-coupling calculations 2 Coplanar scattering geometry 2 Differential cross section 2 Electron emission 2 Electron emission energy 2 Electron impact 2 Energy configurations 2 High energy physics 2 High impact energy 2 Low momentum transfers 2 Molecules 2