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- W1982156793 abstract "Abstract An unusual variety of exsudatinite is found in four Middle Paleozoic shales of the Permian Basin. Its strong blue to blue-green (λmax = 450–470 nm) fluorescence highlights it prominently along sedimentary bedding partings and microfractures. Unlike most primary liptinites, fluorescence spectra of this microfracture exsudatinite are characterized by additional structure in the form of competitive peaks in the green wavelengths (480–500 nm) and a broad secondary structure in the yellow wavelengths. Subtle flow structures are common along the extent of the maceral which may reach maximum widths of approximately 10 μm and lengths of 100 μm. Time-resolved fluorescence data indicate a complex fluorescence of several nanosecond and sub-nanosecond lifetimes. Unperturbed fluorescence lifetimes (3.0–7.4 ns) are significant in Woodford and Wolfcamp shales, but are minor or absent in Atoka and Canyon Group shales. These lifetimes are interpreted to represent aromatics and heteroaromatics (3–5 rings) in relatively unperturbed fluorescence microenvironments where the radiative rates are high. In contrast, two other groups of shorter lifetimes suggest that the natural decays of molecules are influenced by photochemical interactions that are shorter than natural fluorescence decay. We speculate that intermediate lifetimes (1.3–2.6 ns) indicate charge transfer perturbations to various degrees by peripheral electron-donating functionals. These exciplexes represent the inter- and intramolecular transfer of non-bonded electrons from ground state donors to proximal and coplanar excited acceptors. The shortest lifetimes (〈0.30 ns) may be ascribed to several processes that severely perturb the fluorescence." @default.
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- W1982156793 date "1991-11-01" @default.
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- W1982156793 title "Photochemistry of an unusual exsudatinite in Permian Basin shales" @default.
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- W1982156793 doi "https://doi.org/10.1016/0009-2541(91)90067-2" @default.
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