Colliding beam studies of electron detachement from H− by multiply‐charged ions

Employing the crossed‐beams technique, we have investigated electron‐detachment processes from H− in collisions with multiply‐charged noble gas ions Aq+. Absolute cross sections for single‐ and double‐electron removal have been measured at center‐of‐mass energies from 50 keV to 200 keV and charge states q up to 8.The single‐electron removal cross sections are nicely produced by calculations based on a generalization of the Keldysh theory for multi‐photon ionization.