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How exactly does the oxygen quench the fluorescence?

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Oxygen as a triplet molecule is able to quench efficiently the fluorescence and phosphorescence of certain luminophores. This effect (first described by Kautsky in 1939) is called "dynamic fluorescence quenching." Collision of an oxygen molecule with a fluorophore in its excited state leads to a non-radiative transfer of energy. The degree of quenching is related to the frequency of collisions, and therefore, to the concentration, pressure and temperature of the oxygen-containing media. more
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