The yields of methyl viologen radical cation
(MV•+) in the radiolysis of
nitrogen-saturated 0.5 mM methyl
viologen (MV2+) solutions containing formate were
measured using 60Co γ-rays, 1H ions of
2−15 MeV, and
4He ions of 5−20 MeV. The concentrations of
formate were 1, 10, 100, and 1000 mM, which correspond
to OH radical scavenging capacities of 3.2 × 106 to 3.2
× 109 s-1. Methyl viologen
radical cation yields
should be stoichiometrically equivalent to the sum of the hydrated
electron, H atom, and OH radical yields.
This outcome is found in γ-ray radiolysis except at very high or
low formate concentrations. At all formate
concentrations, the 1H and 4He ion
radiolyses give yields of methyl viologen radical cations that are
significantly
lower than expected from the results of other aqueous solutions.
Possible reasons for the differences are
discussed.
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