There is no significant statistical difference in the oscillator strength between the TDMparallel dimers and the TDM-perpendicular dimers because the TDM cancellation only has a trivial effect when monomer X has negligible S1 TDM. Overall, the dimer oscillator strength will be closer to that of the monomer with lower E 5% , and the fluorescence quenching effect Previous sections revealed that the dimer fluorescence energy is lower than both of its monomers. To evaluate the generalizability of this conclusion, we extended our investigation to 496 different dimers constructed by 31 coal asphaltenes. According to the fluorescence energy of these monomers and dimers shown in Figure , the dimer E 5% has a clear correlation with the lowest monomer E 5% . The fluorescence energies of 494 out of 496 dimers are lower than both of their monomers, with the only two exceptions: C02-C03 and C03-C07.