Figure 13: Dependences of (top) and log ()) (bottom) on for quenching of excited singlet state of thioxanthone by methylbenzenes (triangles) and methoxybenzenes (circles) in MeCN (according to the experimental data of Jacques et al. ). Best plots are shown for simulation of the experimental dependence by (3) ( and 0.5 eV, resp.) (dash lines) and by concatenated mechanism (16) (solid lines). Dotted line shows thermodynamic limit for ET. Experimental dependence of the exciplex emission frequencies, , on in MeCN is shown in the middle panel.