500 1000 1500 2000 - 0.04 - 0.02 0.00 0.02 0.04 0.06 0.08 0.10 500 1000 1500 2000 - 0.0004 - 0.0003 - 0.0002 - 0.0001 0.0000 0.0001 33 FIG. 12: The normalized hydrogen atom 2 s state lower component wave function f ( x ) (solid curve) and ψ$_{b}$ ( x ) = f ( x ) /x (dashed curve). FIG. 11: The normalized hydrogen atom 2 s state upper component wave function g ( x ) (solid curve) and ψ$_{a}$ ( x ) = g ( x ) /x (dashed curve).