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 − g 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
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 83, No. 6, pp. 847–853, November–December, 2016.
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Jarnikova, E.S., Parkhats, M.V., Stasheuski, A.S. et al. Effect of Solvent Dielectric Properties on the Spontaneous-Emission Rate Constant of Molecular Singlet Oxygen. J Appl Spectrosc 83, 903–908 (2017). https://doi.org/10.1007/s10812-017-0382-x
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DOI: https://doi.org/10.1007/s10812-017-0382-x