Time-resolved fluorescence acridine

Diverdi LA, Topp MR (1984) Subnanosecond time-resolved fluorescence of acridine in solution. J Phys Chem 88(16) 3447-3451... 

Figure 6. Time-resolved fluorescence of a 1.1 x Id1 M acridine in hexane excited by a 0.1-mJ, 355-nm laser pulse. The experimental points, which are averagedfrom nine laser shots, are displayed with the computer-generated curves that were calculated to fit fluoresence risetimes, rR, and fluorescence decay times, tf, to the experimental data. (Reproduced with permission from Ref. 26. Copyright 1980, North-Holland Publishing...

Morphology dependent resonances (MDR) are observed in the fluorescence of 9-amino acridine hydrochloride hydrate (9AAHH) impregnated single microparticles. These MDRs influence the radiative rate of the molecule. From the time-resolved measurement with a resolution of ns we have determined the femtosecond dephasing time of the molecule in a polymer matrix at room temperature. 

The time evolution of the triplet character, L(t), may be determined by time-resolved measurements of absorption at wavelengths corresponding to the T-T transitions from initially populated (unrelaxed) Tj levels (Ashpole et ai, 1971). It has been shown that for collision-free naphthalene and 1-methylnaphthalene, the T-T absorption builds up with the rate constant of the singlet (fluorescence) decay (Soep et ai, 1973). Similar results have been obtained for acridine, where the fluorescence decay and triplet induction time are of the order of lOpsec (Hirata and Tanaka, 1977) (see Fig. 16). 

---