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Measured cross sections for electron capture by a variety of multiply charged ions in collisions with atomic and molecular hydrogen are presented. The data are primarily for.He-like and Li-like ions of B, C, N, and 0 in the velocity range 0.4-1.0)& 10' cm/sec. The electron-capture cross sections for these ions are typically 3 X 10 " cm in the velocity range tested. Comparison is made between these data and a number of recent theoretical predictions. While no simple scaling rules apply to these low-velocity data, for initial charge q ) + 4 the cross sections are essentially characterized by initial ionic charge rather than by projectile mass or electronic structure.

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