Abstract
Interactions of mass-selected doubly charged ions with a metal surface have been studied in a modified hybrid mass spectrometer. The primary ion is generated by electron impact upon toluene, mass-selected using a magnetic sector, and the products of 135° scattering, 44 eV laboratory energy collisions are mass-analyzed using a quadrupole mass filter. Charge exchange is the dominant process, al scattered ions being singly charged with the exception of [C 7H 6 2+], an exceptionally stable ion which is formed upon impact of [C 7H 8 2+]. Simple charge exchange is observed for ▪ (to yield the stable C 7H 7 + ion) but dissociative charge exchange is far more important. Comparison of the daughter ion spectra of singly and doubly charged ions of composition C 7H n ( n=6–8) reveals striking similarities which suggest that the reaction sequence at the surface is charge exchange followed by dissociation, rather than the reverse order. The collision process can be accompanied by hydrogen atom pick-up at the surface, a potentially important new type of ion/surface reaction.
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