Singlet oxygen, 1O2, is a highly reactive excited state of oxygen molecule. Singlet oxygen generation plays important role in a variety of processes ranging from biomedical application in photodynamic therapy (PDT) for cancer treatment to photosensitized oxidations, biomolecular degradation and environmental clean-up.
Ground state O2 is known to exist uniquely as a triplet state. The spin-selection rule reduces its reactivity by forbidding reactions with singlet state species, which comprise the majority of compounds. However, the first excited state of oxygen molecule is a singlet state, which can readily react with other singlet molecules. Radiative decay to the triplet ground state is a spin-forbidden transition resulting in a long-lived excited state producing a rather weak phosphorescence emission peaking at ~ 1270 nm. The production of singlet oxygen can be accomplished through the use of photosensitizers (PS).
Modular Research Fluorometer for Lifetime and Steady State Measurements
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