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1H NMR spectra of the electron-irradiated PCBM at different fluences. (A) a new signal at 3.79 ppm develops, which corresponds to the hydrogen a of the methoxy group attached on the para position of phenyl ring in the PCBM. (B) Another new signal at 6.86 ppm corresponds to the hydrogen b on the meta position of phenyl ring in the PCBM. (C) The hydrogen c on the ortho position of phenyl ring is displayed in the 2D H-H COSY, which is positioned at 7.24 ppm.
