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Kinetics of Induced Absorption of Multiatomic Molecules during Two-Photon Excitation

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Abstract

The kinetics of triplet—triplet absorption of multiatomic molecules (by the example of halogen-substituted of fluorescein, i.e., eosin and erythrosine) is studied in the case of step population of their high triplet levels using two laser pulses with tuned delay between them. It is shown that the kinetics of the induced absorption allows estimation of the efficiency of competing relaxation channels of highly excited triplet states of molecules. In the absence of energy transfer to environment and photochemical reactions, the main relaxation channel of high triplet states of molecules containing heavy halogen atoms is the reverse triplet—singlet intersystem crossing. When interpreting the results of the study, thermal effects caused by medium heating due to nonradiative relaxation of high electronic excited states of molecules should be taken into account.

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Funding

This study was supported by the Ministry of Science and Higher Education of the Russian Federation (project no. FSGU-2020-0003).

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Authors and Affiliations

  1. Orenburg State University, 460018, Orenburg, Russia

    S. N. Letuta, A. T. Ishemgulov, D. V. Dorofeev & D. E. Tsyurko

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  1. S. N. Letuta
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  2. A. T. Ishemgulov
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  3. D. V. Dorofeev
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  4. D. E. Tsyurko
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Correspondence to A. T. Ishemgulov.

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Translated by A. Kazantsev

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Letuta, S.N., Ishemgulov, A.T., Dorofeev, D.V. et al. Kinetics of Induced Absorption of Multiatomic Molecules during Two-Photon Excitation. Bull. Lebedev Phys. Inst. 50 (Suppl 1), S54–S59 (2023). https://doi.org/10.3103/S1068335623130055

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  • DOI: https://doi.org/10.3103/S1068335623130055

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