The distributions of the 132 asphaltene monomer's fluorescence energy (E 5% ) and molecular weight are summarized in Figure . Monomer fluorescence exhibits a broad distribution centered at 3.18 eV (390 nm) throughout the infrared, visible, and ultraviolet wavelengths, which reflects the structural diversity of our monomer data set. The molecular weight of Compared with the experimentally observed photon energy 1.91-3.10 eV (400-650 nm), the calculated monomer fluorescence energy is significantly higher, with only 43 out of 132 (32.6%) molecules falling in that range. Apart from the possible aggregation-induced redshift and errors in the DFT functional, we believe this is caused by the choice of excitation wavelength, as the shortest emission wavelength never exceeds that of the excitation light.