The positronium-formation cross section was measured for positron collisions with atomic hydrogen in a crossed-beam experiment. Measurements were made in the energy range of 13 eV{≤}E{≤}205 eV. At E=15±{}2.8 eV we observed a maximum cross section of (4.3±{}0.8)×{}10^-16 cm²; because of averaging over an energy-resolution function of 6.5 eV FWHM, the observed maximum is a lower limit of the true maximum. For E{≥}75 eV the cross section is zero within our error margin of 0.3×{}10^-16 cm². No other measurements but numerous theoretical predictions are available for comparison.
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Sperber et al. (1992) studied this question.
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