Abstract
The relative yield of the molecular ions (HCF 2 + and DCF 2 +) produced by the bond-forming reaction between HD and CF 2 2+ has been determined as a function of the collision energy from 0.17 to 0.62 eV in the centre-of-mass frame. At low collision energies, this chemical reaction exhibits an intramolecular isotope effect favouring the formation of DCF 2 +. This isotope effect increases in strength with decreasing collision energy and at the lowest collision energies we detect approximately twice as many DCF 2 + as HCF 2 + ions. One possible explanation of this observation is that electron transfer precedes the bond-forming step of the chemical reaction.
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