The cross sections for the double ionization of ${\mathrm{H}}_2$ by 0.08–1.0-MeV/amu ${\mathrm{D}}^{+}$ and 0.40–3.5-MeV/amu ${\mathrm{H}}^{+}$ are reported for the ${\mathrm{H}}_2$ internuclear axis oriented at 90° and 30° relative to the ion-beam direction. There is no apparent difference between the cross sections at the 90° orientation and at the 30° orientation. Bethe theory does not give qualitative agreement with the experimental results.

• Received 30 July 1984

DOI:https://doi.org/10.1103/PhysRevA.31.99