His study of the electrodynamic theories of Andr?Marie Amp�re and Wilhelm Weber led him to reconsider the usual interpretation of the Rutherford scattering data, which ignores the variation in force between charged particles as a result of relative velocities and accelerations.
12.
The scattered ion intensity is always very large compared to the recoil intensity ( the Rutherford scattering cross-section formula goes to infinity as the scattering angle goes to zero ), and for ERD the scattered beam usually has to be excluded from the measurement somehow.
