Fig. 6a and Fig. 6b, respectively, show the speed effect on the absorption spectra of R 6G film
samples at 10-4 M of one and two layers. This dye has neat and structured spectra for all spinning speeds. Fig. 6a, for one layer samples, shows that the peak absorbance increases as the spinning speed increases, reaching a maximum value at about 3000 rpm and then decreases (see Fig. 9b). In the case of two layers, the peak absorbance decreases monotonically as spinning speed increases. A similar behavior was noticed for the ratio of the peak absorbance of the monomer to
that of the dimer (see Fig. 8).