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• W2045296044 startingPage "473" @default.
• W2045296044 abstract "Abstract The fluorescence quenching of four secondary liquid scintillation counters—POPOP, PBBO, α -NPO and BBO—by transition metal ions has been carried out in 40% methanol–water mixture at room temperature. The quenching is found to be appreciable and purely dynamic. The quenching rate constants were determined using the Stern–Volmer equation. The mechanism of quenching by a series of transition metal ions on these scintillation counters was studied. A reasonable linear fit of the logarithm of the bimolecular quenching constant (log k q ) with halfwave reduction potential ( E 1/2 ) of the various metal ions was obtained. A similar correlation between the bimolecular quenching rate constant (log k q ) and the oxidation potential of the scintillation counters was also observed. These results indicate the mechanism of quenching to be electron transfer in nature, mediated by the formation of a nonemissive exciplex and the direction of electron transfer is ascertained to be from the excited fluorophore to the metal d-orbitals, The values of Δ G ↕ 0 (the activation energy for the electron transfer process at Δ G =0) and the free energy at which the quenching is purely diffusion limited have been approximately estimated." @default.
• W2045296044 created "2016-06-24" @default.
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• W2045296044 date "1998-10-01" @default.
• W2045296044 modified "2023-09-23" @default.
• W2045296044 title "Fluorescence quenching of liquid scintillation counters by metal ions" @default.
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• W2045296044 doi "https://doi.org/10.1016/s1350-4487(98)00066-3" @default.
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