Figure 2.

Experimental transient EPR spectra of the porphyrin monomer (top) and dimer (bottom) as average up to 2 μs after the laser pulse with unpolarized light at 532 nm. The spectra were recorded at 20 K on 0.1–0.2 mM solutions of P1 and P2 in 10:1 MeTHF:pyridine. Simulations performed in EasySpin⁴² with the parameters reported in Table 1 are compared to the experimental data. The energy ordering of the triplet sublevels was chosen as |Z| > |X| > |Y| and the canonical field positions are indicated (A = absorption, E = emission).