Fig. 5. Transient absorption of SQ and SR dyes templated in the form of transverse dimers using a DNA Holliday junction.

a, b Selected TA spectra of the SQ and SR dimer solutions. Experiments were performed with incident pump wavelengths of 620 and 690 nm, respectively. The inset in each panel displays 10 ps spectra obtained for the solutions at two distinct pump wavelengths with comparable pump fluence. c, d Selected kinetics trace for the SQ and SR dimer solutions obtained with pump wavelengths of 620 and 690 nm, respectively. The probe wavelengths were selected to coincide with the largest amplitude GSB feature appearing in the TA spectra of each solution at ca. 620 and 690 nm, respectively. The kinetics traces have been normalized to their maximum amplitude. A fit from a global target analysis (see Supplementary Note 15) overlays the data in each panel and the lifetime of the corresponding dimer structure is indicated in the plot.