New experimental data are presented for the scattering of 35-keV electrons by He, Ne, and Ar in the limit of vanishing momentum transfer. Previous data of Geiger and Mor\'on-Le\'on show a strong forward peak with structures similar to a Fraunhofer diffraction pattern (shadow scattering) for elastic scattering of 15-25-keV electrons. No recent theory can explain this effect; therefore we repeated the experiment. The new data agree well with partial-wave calculations utilizing configuration interaction and Hartree-Fock potentials. The results are compared with the previous unexpected findings.
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Coffman et al. (1985) studied this question.
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