High-energy electron scattering from helium

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Abstract
Total (elastic and inelastic) differential scattering cross sections for 40-keV electrons incident on helium have been measured with a precision of 0.1%. Theoretical scattering intensities as given by an explicitly correlated wave function are compared with experimental results. It is shown that corrections to the Morse expression for kinematic effects, at small angles, are adequate to relate scattering intensities at constant angle to incoherent x-ray scattering factors.