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

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 ki...

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Bibliographic Details
Published in:Bulletin of the Lebedev Physics Institute 2023-07, Vol.50 (Suppl 1), p.S54-S59
Main Authors: Letuta, S. N., Ishemgulov, A. T., Dorofeev, D. V., Tsyurko, D. E.
Format: Article
Language:English
Subjects:
Absorption
Effect of Laser Radiation on Materials
Energy transfer
Kinetics
Photochemical reactions
Physics
Physics and Astronomy
Temperature effects
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Summary: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.
ISSN:1068-3356
1934-838X
DOI:10.3103/S1068335623130055