Femtosecond broadband transient absorption experiments were performed to investigate the electronic relaxation pathways and to quantify their rates. Figure presents the transient absorption spectra of 6MP upon excitation at 334 nm. As can be seen in Figure -c, at time delays up to time zero, a band grows with maxima in the range of 550 to 600 nm regardless of the pH used. After time zero, a transient signal develops exhibiting absorption maxima at ca. 480