Absolute cross sections for transfer ionization in ${\mathrm{H}}^{+}$+${\mathrm{H}}^{\mathrm{-}}$ collisions have been measured in the center-of-mass energy range 50 eV–40 keV, with the use of merged- and crossed-beam techniques, together with coincident detection of the products. A mechanism is proposed for the process in the low-energy region. The cross section, calculated accordingly, is found to be in satisfactory agreement with the experimental data.

• Received 20 July 1987

DOI:https://doi.org/10.1103/PhysRevLett.59.1565