“…We evaluated the areas under two sets of bands, (a) the normalized CH 2 /CH 3 stretch band just discussed ( A (CHx) ), and (b) the normalized CO stretch band near 1753 cm −1 ( A (C=O) ), then calculated the area ratios A (C=O) / A (CHx) , and show in Figure (b) a plot of these versus the corresponding E m values: E m = 0 represents spectrum A, the pristine liquid monomer, while data points to the right of it, respectively, represent spectra E, D, and C. The reason for selecting the CO absorption band for this purpose is that its intensity represents a reliable diagnostic for the extent to which structure of the EL monomer molecule [see (1)] is retained in the PP‐EL deposit. One notes from Figure (b) that the four data points (A, E, D, C) very closely follow a straight line plot; calculation of the regression line enabled extrapolation of the data point for spectrum B, the one representing the PP‐EL deposit (designated “EL‐Ar PP 2”) of Laurent et al On the basis of this argumentation, we can surmise that their corresponding E m value was close to 59 eV/molecule.…”