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Π₯Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ° Π’1-ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΌΠΎΠ»Π΅ΠΊΡΠ» ΠΏΠΎΡΡΠΈΡΠΈΠ½ΠΎΠ² Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΈΡΠ»Π΅Π½Π½ΠΎΠ³ΠΎ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΊΠΈΠ½Π΅ΡΠΈΠΊΠΈ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΡ ΠΈ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΡ ΠΈΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΠ»ΡΠΎΡΠ΅ΡΡΠ΅Π½ΡΠΈΠΈ
For a number of porphyrin molecules, it was shown that their excitation by light pulses of a rectangular step shape and a certain duration led to experimentally observed dynamical decrease and increase of fluorescence kinetics due to changes in the population of the lower (metastable) triplet T1 state. On the basis of exact analytical expressions for a three-energy-level model, a simple analytical relationships between the rate constants of intramolecular processes and experimentally measured parameters of the fluorescence kinetics were obtained. The three-dimensional isotropic orientation of the molecules in the framework of the chosen model was taken into account by numerical methods and allowed to simulate adequately the experimentally observed fluorescence kinetics. The T1 state lifetimes of the studied porphyrin molecules in polymer matrices were determined from experimental curves using numerical methods for solving inverse problems. The obtained values correlated with literature data. Features and advantages of this approach were discussed