Hyperspherical Sturmian 8 Wave functions 8 Dinger equation 4 Hyperspherical coordinates 4 Scattering problems 4 Spherical coordinates 4 Three body 4 Three-body wave functions 4 Transition amplitudes 4 Analytical expressions 2 Analytical results 2 Asymptotic analysis 2 Asymptotic behaviour 2 Asymptotic limits 2 Basis functions 2 Basis sets 2 Bound state 2 Calculations 2 Collision problem 2 Collision process 2 Computational requirements 2 Convergence rates 2 Discrete functions 2 Discretization scheme 2 Double ionization 2 Electric dipole oscillators 2 Electric fields 2 Electron-electron interactions 2 Electrons 2