Momentum distributions for E
= 2 2 . 0 eV. The experimental distributions are created by (a) projecting all momenta on the detector plane and (b) showing only events within a velocity window of 50 ms −1 around the maximum. Simulations are conducted that use the same velocity window, and theoretical differential cross sections are taken from (c) CCC calculations and (d) RMPS calculations. The circles correspond to excitation of the 23S state (solid line), 21S state (dashed line) and 23P state (dotted line).