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Transfer ionization in He2+-H- collisions: measurement of the exothermicity and theoretical interpretation

The energy imparted to the ions in the transfer ionization reaction He2++H- to He++H++e has been measured in a merged beam experiment using two different techniques (magnetic analysis and time-of-flight). The result obtained in both cases is of the order of 6 eV and confirms that the transfer ionization proceeds in two steps: a single electron transfer at large internuclear separation followed by a resonant Penning ionization at small distances. With this view, a simple calculation of the cross section is presented, with results that are in good agreement with the available experimental data.