Characterization of excited-state reactions with instant spectra of fluorescence kinetics

Томин, В. И.; Ushakou, Dzmitryi V.

doi:10.1016/j.jlumin.2015.05.058

Cited by 9 publications

(5 citation statements)

References 31 publications

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“…Now the ratio of the populations does not approach zero level but some constant positive value depending on the system parameters. This behavior clearly indicates appearing of the energy exchange between two excited states

S_{1}^{N}

and

S_{1}^{P}

which is in good agreement with experimental observations of the time behavior of the instantaneous spectra of FME molecules …”

Section: Introductionsupporting

confidence: 91%

“…This behavior is in full concordance with that observed in the case of the photoexcitation of ESR ‐ molecules at the main absorption band by short delta pulses ,. The ratiometric parameter

[N^{*}] / [P^{*}]

continuously decreases approaching zero as the population of the state

N^{*}

decays up to the zero level.…”

Section: Introductionsupporting

confidence: 88%

“…This behavior of the ratiometric parameter completely corresponds to the picture observed upon photoexcitation of ERS ‐ molecules in the main absorption band of 3‐HF and, hence, corresponds to the Kasha rule. The time dependence of the ratiometric parameter also indicates the kinetic character of ESR in full agreement with the suggested approach, to the interpretation of the instant spectra intensities of the both forms excited by short pulses.…”

Section: Introductionsupporting

confidence: 81%

“…Figure represents the time dependences of the concentrations of

{[N^{*}]}_{t}

and

{[P^{*}]}_{t}

forms, and of their ratio

{(() [N^{*}] / [P^{*}])}_{t}

which are grouped in the four panels A−D. The used parameters were chosen to be close to the experimental parameters of ESR objects carefully studied ,…”

Section: Introductionmentioning

confidence: 99%

“…Earlier, the model of kinetic reaction based on intensity ratio of the instantaneous spectra of both forms was proposed for a short

δ

‐ excitation pulse.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Anti‐Kasha Photoreactions. Direct Excitation of a Higher Excited State

Томин

Dubrovkin

2017

ChemistrySelect

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Excited-state reactions (ESR) are of overwhelming importance in chemistry, physics and biology. Kinetics and steady-state characteristics of ESR are usually analyzed in the framework of the model, in which the first excited state of the initial form is populated. Due to the growing attention which is lately paid to the reactions excited through the energy levels higher than the first singlet level, we had developed new model of these reactions, describing the time characteristics of the normal form and the photoproduct populations. The system was excited via the higher S n singlet state. Generation of reaction product from both the first S 1 and S n excited states was studied. The model of arbitrary ESR was represented as a system of linear differential equations. Precise analytical solution was firstly obtained for the general case. Numerical analysis carried out on ESR parameters made it possible to reveal the role of reverse ESR, to estimates the S n state lifetime effect and the contribution of product formation due to the opening of its generation channel through the S n state. Data obtained theoretically was presented in graphical form which allowed a better understanding of the mechanisms of the photochemical processes and criteria for improving the efficiency of anti-Kasha processes.[a] Prof.

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S_{1}^{N}

and

S_{1}^{P}

which is in good agreement with experimental observations of the time behavior of the instantaneous spectra of FME molecules …”

Section: Introductionsupporting

confidence: 91%

“…This behavior is in full concordance with that observed in the case of the photoexcitation of ESR ‐ molecules at the main absorption band by short delta pulses ,. The ratiometric parameter

[N^{*}] / [P^{*}]

continuously decreases approaching zero as the population of the state

N^{*}

decays up to the zero level.…”

Section: Introductionsupporting

confidence: 88%

Section: Introductionsupporting

confidence: 81%

“…Figure represents the time dependences of the concentrations of

{[N^{*}]}_{t}

and

{[P^{*}]}_{t}

forms, and of their ratio

{(() [N^{*}] / [P^{*}])}_{t}

which are grouped in the four panels A−D. The used parameters were chosen to be close to the experimental parameters of ESR objects carefully studied ,…”

Section: Introductionmentioning

confidence: 99%

“…Earlier, the model of kinetic reaction based on intensity ratio of the instantaneous spectra of both forms was proposed for a short