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Sulphuric acid is an important factor in aerosol nu- cleation and growth. It has been shown that ions enhance the formation of sulphuric acid aerosols, but the exact mecha- nism has remained undetermined. Furthermore some studies have found a deficiency in the sulphuric acid budget, suggest- ing a missing source. In this study the production of sulphuric acid from SO2 through a number of different pathways is in- vestigated. The production methods are standard gas phase oxidation by OH radicals produced by ozone photolysis with UV light, liquid phase oxidation by ozone, and gas phase oxidation initiated by gamma rays. The distributions of sta- ble sulphur isotopes in the products and substrate were mea- sured using isotope ratio mass spectrometry. All methods produced sulphate enriched in 34 S and we find an enrich- ment factor ( 34 S) of 8.7± 0.4 ‰ (1 standard deviation) for the UV-initiated OH reaction. Only UV light (Hg emission at 253.65 nm) produced a clear non-mass-dependent excess of 33 S. The pattern of isotopic enrichment produced by gamma rays is similar, but not equal, to that produced by aqueous oxidation of SO2 by ozone. This, combined with the relative yields of the experiments, suggests a mechanism in which ionising radiation may lead to hydrated ion clusters that serve as nanoreactors for S(IV) to S(VI) conversion.

An isotopic analysis of ionising radiation as a source of sulphuric acid