Collisions of H-2(+) with H: individual fragmentation channels

The dissociation of molecular hydrogen ions with energies up to 100 keV in H targets has been studied. An Si barrier detector is used to distinguish b etween the production of one or more fast fragment ions or neutrals and coi ncidence techniques involving the slow ion or photon produced in the collis ion allow the different dissociation channels to be quantified. The dissoci ative excitation and ionization channels are found to be about an order of magnitude weaker in H than those induced by collisions with electrons. Comp arison with Born calculations shows that the vibrational states of H-2(+) p lay an important role in the dissociation process.