Optical model for positronium formation cross sections ine+‐Kcollisions at low impact energies

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Positronium (Ps) formation cross sections are calculated for positrons scattered by ground-state potassium in the low-energy region $(0.2--15.0\phantom{\rule{0.3em}{0ex}}\mathrm{eV})$ using an optical-model approach. Cross sections for Ps formation in $n=3$ states are obtained for the second time and show great discrepancies with the prediction of McAlinden et al. [J. Phys. B 29, 555 (1996)]. Fairly good agreement is obtained with the measurements of Zhou et al. [Phys. Rev. Lett. 73, 236 (1994)] for a total Ps formation cross section when taking Ps $(n=3)$ formation into account. We present here a full description for Ps $(n=1)$, Ps $(n=2)$, and Ps $(n=3)$ formation cross sections.