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FTIR spectra of the 9-methylantracene (9MA) and pyrene standards in acetonitrile solutions (after the solvent evaporation on the ATR), and after 60 min of ozone treatment in the homogeneous experiments (also after the solvent evaporation on the ATR). The acetonitrile solvent (ACN) spectrum is also displayed as reference. The FTIR spectra are vertically offset for clarity.
