Details are given of a new apparatus and method of measurement of absolute triple differential cross sections (TDCS) in crossed-beam experiments. Supplementary tests and an analysis of error sources show that the absolute error in the measurements is less than 22%. The relative error between individual data points is less than 10%. Preliminary results for an impact energy of 26.6 eV on helium are confirmed and extended to other near-threshold energies and angles, including non-coplanar ones. The method can readily be extended to higher energies and other gas targets. Results are compared with a number of (absolute) calculations.
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Rosel et al. (1992) studied this question.
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