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• W2051916113 abstract "In this paper we measured the fluorescence quantum yield (ΦF) and the reaction quantum yield (ΦPC) of a photochromic molecule (flindersine) as a function of the vibronic level (n) excited within a given sequence. We found that ΦF decreased and ΦPC increased with an increase in the quantum number of the vibronic level excited within a sequence. On the basis of a previously proposed model, this behavior was interpreted as resulting from competition between vibrational relaxation and photochemistry at each vibronic level. This model was broadened, and a new equation developed which, alone, or in combination with fluorescence data, permits determination of (1) the molar extinction coefficient of the partially produced colored form, (2) the quantum yield of vibrational relaxation, ΦV, and the complementary ΦPC at each vibronic level, (3) the photochemical reaction rate constant, kPC, (4) the nonradiative internal-conversion rate constant from S1 to S0, kNR, and (5) the vibrational relaxation rate constant among the n levels of S1, kV. The kPC value (1.7 × 1010 s-1) is comparable to kV (4.0 × 1010 s-1) and kNR (2.3 × 1010s-1). The data and model account for the significant decrease in ΦF with an increase in the value of n excited. Therefore, from the results here as well as those from our previous works, we propose the theory that for molecules undergoing excited-state photochemistry, there will be a vibronic-level dependence for ΦPC and ΦF and potentially for the triplet state yield ΦT as well. It also appears that there can be a vibronic-mode and electronic-state dependence for these parameters. The nature of the photochemistry could also well be mode-dependent." @default.
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• W2051916113 date "1999-02-26" @default.
• W2051916113 modified "2023-09-23" @default.
• W2051916113 title "Vibronic Quantum Effects in Fluorescence and Photochemistry. Competition between Vibrational Relaxation and Photochemistry and Consequences for Photochemical Control" @default.
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• W2051916113 doi "https://doi.org/10.1021/ja982933p" @default.
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