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TIME RESOLVED STUDIES OF 1.27 μm LUMINESCENCE FROM SINGLET OXYGEN GENERATED IN HOMOGENEOUS and MICROHETEROGENEOUS FLUIDS
Author(s) -
Rodgers Michael A. J.
Publication year - 1983
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1983.tb04440.x
Subject(s) - singlet oxygen , luminescence , chemistry , oxygen , analytical chemistry (journal) , phosphorescence , homogeneous , molecule , micelle , germanium , photochemistry , flash photolysis , fluorescence , materials science , chromatography , organic chemistry , optics , optoelectronics , reaction rate constant , silicon , kinetics , physics , aqueous solution , quantum mechanics , thermodynamics
‐The luminescence at 1.27 μm from the 3 →→ 1 δ g transition of the oxygen molecule has been detected from a variety of liquid systems. A Q‐switched laser delivering pulses of 532 nm light was the excitation source, a germanium photodiode was the detector and substituted porphyrins were used as photosensitizers. Protio‐ and deutero‐ forms of several solvents were studied and the singlet oxygen lifetimes determined directly agreed well with published values. T δ in D 2 O was found to be 55 μs and, by extrapolation from a series of H 2 O ‐ D 2 O mixtures, a value of 3.3 μs was obtained for T δ in H 2 O. The technique was shown to be useful in measuring T δ values in several microheterogeneous systems such as surfactant micelles, vesicles and human serum albumin.