Atoms Hyperspherical coordinates Wave functions Hyperspherical Sturmian functions Confined atoms Dinger equation Electric fields Fullerenes Sturmian Transition amplitudes Analytic expressions Analytical expressions Asymptotic analysis Asymptotic limits Atom lasers Atomic Physics Basis sets Bound state Boundary conditions Calculations Closed form solutions Collision process Configuration interaction method Convergence rates Critical nuclear charge Discrete functions Discretization scheme Double ionization Double photoionization