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Detection of Near-IR Singlet Oxygen Luminescence with an FT-Raman Spectrometer

Volume 48, Number 4 (April 1994) Page 539-541

Macpherson, Alisdair N.; Turner, Paul H.; Truscott, T. George


The first excited state of molecular oxygen, O2(1Δg), lying at 0.98 eV above the ground state, O2(3Σg-), is relatively long-lived as a consequence of the multiple forbiddenness of the O2(1Δg) → O2(3Σg-) transition. As a result, O2(1Δg-) shows high reactivity to organic substrates, and irreversible photo-oxidative damage may occur. A typical example is that singlet oxygen is believed to be the cytotoxic species generated in the photodynamic therapy (PDT) of cancer.