Effect of Solvent Dielectric Properties on the Spontaneous-Emission Rate Constant of Molecular Singlet Oxygen
| Autor: | Alexander S. Stasheuski, E. S. Jarnikova, Boris M. Dzhagarov, Marina V. Parkhats |
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| Rok vydání: | 2017 |
| Předmět: |
Photon
010405 organic chemistry Singlet oxygen Transition dipole moment Dielectric 010402 general chemistry Condensed Matter Physics Photochemistry 01 natural sciences Molecular physics 0104 chemical sciences chemistry.chemical_compound Reaction rate constant chemistry Radiative transfer Spontaneous emission Luminescence Spectroscopy |
| Zdroj: | Journal of Applied Spectroscopy. 83:903-908 |
| ISSN: | 1573-8647 0021-9037 |
| Popis: | Quantum yields and luminescence lifetimes of singlet oxygen in 18 different solvents and binary mixtures were measured using laser fluorometry. The results allowed a direct effect of the refractive index on the radiative rate constant kr of the singlet-oxygen a 1 Δ g → X 3 Σ − transition caused by a change of photon state density in addition to an indirect effect through a local-field factor to be determined. The experimentally observed rise of kr with increasing medium refractive index could not be explained by the influence of only these two factors. The discrepancy was overcome by taking into account changes of the singlet-oxygen transition dipole moment. Consideration of all three factors explained the influence of the medium on rate constant kr |
| Databáze: | OpenAIRE |
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