To estimate a correlation length, Δδ values are calculated for a series of 5 to 7 simple aromatic molecules (coronene, circumcoronene, dicircumcoronene, etc.) with increasing size and compared with the Δδ values determined experimentally. This (A) 19 F NMR spectra of the commercial activated carbons and activated carbon cloths soaked with 1 M NEt4BF4 (ACN). (B) 19 F NMR spectra of the pristine ACS-PC and thermally annealed ACS-PCs soaked with 1 M NEt4BF4 (ACN). (C) 9 F NMR spectra of the pristine EL-104 and thermally annealed EL-104s soaked with 1 M NEt4BF4 (ACN). The in-pore linewidths for the different studied carbons differ, which could arise from the distributions of ions in various pore environments , the mobility of ions in the pores , and/or the different exchange rates between in-pore and ex-pore ions . Table : Table of coefficients (including standard errors) from exponential equations for each carbon, where the equation for an exponential line is y = y0 + (A * exp(R0 * x)), where A is amplitude and R0 describes the rate of decay. The exponential fittings of PW-400 and YP-50F are described by lower amplitudes and less negative rates of decay, indicating a slower decay of the pairwise C-C correlations compared to SC-1800 and ACS-PC. For YP-50F and YP-80F, similarities between the exponential fittings are consistent with the similar capacitance for the two carbons.