Direct Spectroscopic Observation of Singlet Oxygen Emission at 1268 nm Excited by Sensitizing Dyes of Biological Interest in Liquid Solution
Abstract
The direct observation of dye-photosensitized 1268-nm emission of the 1Δg → 3Σg transition of molecular oxygen in liquid solution at room temperature is reported. Singlet oxygen was photosensitized by UV excitation of perfluorobenzophenone in fluorocarbon solvent, by 3,4-benzpyrene and hematoporphyrin in carbon tetrachloride, and by methylene blue in water. Also reported is the development of an extremely sensitive near-infrared spectrophotometer that uses a thermoelectrically cooled lead sulfide detector, optimized optics, and a boxcar integrator as a data processor.
- Publication:
-
Proceedings of the National Academy of Science
- Pub Date:
- December 1979
- DOI:
- 10.1073/pnas.76.12.6047
- Bibcode:
- 1979PNAS...76.6047K