Abstract
We have studied the oxidation of multilayer thin films of coronene (C24H12) on graphite under UHV conditions. Coronene films were grown by low-energy cluster ion beam deposition (LECBD, C24H12+, Ekin < 6 eV) and subsequently oxidized by exposing them to a beam of near-thermal atomic oxygen at room temperature. Mass spectra recorded during sublimation of the oxidized coronene films reveal a distribution of emitted species, C24H12On (n ≤ 7), which we assign as coronene epoxides. From the fragmentation pattern we infer that primarily rim epoxides are formed, which exhibit a higher stability than core epoxides according to DFT calculations. In addition to epoxides, XPS indicates that other oxidic functional groups, such as ethers, are also formed in smaller relative amounts as nonsublimable species. The overall yield for the thermal desorption of intact coronene oxides can be up to 7% of the deposited coronene, sufficiently high such that this procedure could be useful as a source of monodispersed nanoscale g...
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