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  1. Sep 2023
  2. chem.libretexts.org chem.libretexts.org
    Fluorescence and Phosphorescence
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    1. bockisch 20 Sep 2023
      Dissolved oxygen in a solution increases the intensity of the fluorescence by photochemically inducing oxidation of the fluorescing species.Quenching results from the paramagnetic properties of molecular oxygen that promotes intersystem crossing and converts the excited molecules to triplet state.Paramagnetic species and dissolved oxygen tend to quench fluorescence and quench the triplet state.

      Dissolved oxygen in a solution DECREASES the intensity of the fluorescence by photochemically inducing oxidation of the fluorescing species. Quenching also results from the paramagnetic properties of molecular oxygen which promotes intersystem crossing and converts the excited molecules to triplet state. Paramagnetic species and dissolved oxygen tend to quench fluorescence and phosphorescence.

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    chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Spectroscopy/Electronic_Spectroscopy/Fluorescence_and_Phosphorescence