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Distorted-wave Born approximation for asymmetric ionisation of argon by electron impact

Experimental differential cross sections, measured on a single arbitrary scale, are compared with the distorted-wave Born approximation for the 1000 eV coplanar asymmetric (e, 2e) reaction on argon to the 15.8 eV (3p) and 29.3 eV (3s) states of the ion. The energy of the slower outgoing electron is 120 eV. Three cases are considered for which the polar angle of the faster electron is 20 degrees , 14 degrees and 8 degrees . The DWBA describes the whole experiment, essentially within experimental error.