Abstract
Free radicals have been formed by the addition of muonium (a radioactive hydrogen atom with a positive muon as its nucleus) to Volatile Organic Compounds (VOCs), sorbed on the surfaces of solid materials, representative of those found in the atmosphere, specifically: clays, porous carbon, silica-gel, zeolites and ice. Using techniques of transverse-field muon spin rotation (TF-MuSR) and longitudinal-field muon spin-relaxation (LF-MuSRx), motional correlation times for reorientation of molecular radicals on these surfaces were determined, and activation energies were estimated from their temperature dependences. The results are interpreted in terms of sorption within the pores and the interaction with specific surface sites in these materials.Key wordsVolatile Organic CompoundsVOCRadiolabellingAtmosphereRadicalsTroposphereOxidationHeterogeneousSurfacePollutionRemediationEnvironment.
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