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A modified two-centre atomic orbital expansion is used in an investigation of electron capture in collisions of H+ and Hez+ ions with Li atoms. The calculated total and partial transfer cross sections constitute the first published origin-independent results in the energy range 0.5-20keV for H + + L i and in the range 0.1-2.0keVamu-' for HeZ+ +Li collisions. Total capture cross sections are found to agree well with experimental data wherever the measurements have led to a consistent picture among themselves. For He2+ + Li collisions, low-energy capture cross sections are predicted to be much larger than is indicated by results from two-state molecular orbital calculations without translational factors.

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