Abstract
The differential cross sections for electrons scattered from atoms are determined in the first Born approximation by the Fourier transform of the sum of the first- (times 2Z) and the second-order density matrix elements. When scattered intensities are measured with high accuracy, features such as electron correlation and relativistic effects can be studied. In the present experiment using 40-keV electrons, a precision of 0.1% in the count rates and 2 arc sec in the scattered angle has been achieved in the angular range of 7 to 200 mrad. The experimental data are matched at large scattering angles to theoretical cross sections based on Hartree--Fock potentials. The deviations between theory and experiment at small angles are discussed with respect to changes in the first- and second-order densities based on configuration-interaction wave functions. (AIP)
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