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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 48,
  • Issue 4,
  • pp. 539-541
  • (1994)

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

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Abstract

The first excited state of molecular oxygen, O<sub>2</sub>(<sup>1</sup>Δ<sub><i>g</i></sub>), lying at 0.98 eV above the ground state, O<sub>2</sub>(<sup>3</sup>Σ<sub><i>g</i></sub><sup>-</sup>), is relatively long-lived as a consequence of the multiple forbiddenness of the O<sub>2</sub>(<sup>1</sup>Δ<sub><i>g</i></sub>) → O<sub>2</sub>(<sup>3</sup>Σ<sub><i>g</i></sub><sup>-</sup>) transition. As a result, O<sub>2</sub>(<sup>1</sup>Δ<sub><i>g</i></sub><sup>-</sup>) 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.

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