Detailed investigations of the inelastic scattering of positrons by lithium and sodium atoms are presented. The targets are described using the Clementi-Roetti wavefunctions within the framework of the one-valence-electron model. The partial cross sections for eight values of the total angular momentum I, (corresponding to 0 s / S 7) are calculated at 25 values of the incident energy k: (0.1 s k : S 1000 eV) using the coupled-static approximation. The resulting total elastic and positronium formation cross sections are compared with those determined by other authors.

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A theorem is presented which proves the existence of a bound state composed of one hydrogen atom and one antihydrogen atom. The extension of the theorem to antihydrogen-deuterium and antihydrogen-tritium systems is discussed.

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