Figure 1From: Novel method for state selective determination of electron-impact-excitation cross sections from 0° to 180°Overview of all momenta of electrons and targets before and after the collision. Collision center is at O. For simplicity, only momentum transfer in the x-y plane is shown. Initial momenta are shown in dotted lines, final momenta in dashed lines, and the momentum transfer is shown in a solid line. Target momenta are shown in blue (thick), projectile momenta in red (thin).Back to article page