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(A) Temporal changes of in situ ATR-IR spectra in the range 1,800–1,500 cm−1 for the fuel-rich flame soot sample during photooxidation by 20% O2. (B) Temporal changes in the integrated areas of peaks at 1,772, 1,734, 1,714, 1,680, 1,628, and 1,591 cm−1.
