Abstract
With a goal of mimicking the mechanisms of the biological effect of
low intensity laser radiation, we have measured the rates of oxygenation
of chemical traps of singlet oxygen in air-saturated organic solvents and
deuterium oxide upon direct (1270 nm) excitation of the 1Δg ->
3Σ g- transition in oxygen molecules. The data were used for
estimation of the molar absorption coefficients of oxygen corresponding to
this transition. The obtained values were compared with the radiative
lifetimes of singlet oxygen calculated from the quantum yields of singlet
oxygen phosphorescence. The quantum efficiencies (the ratios of the
photoreaction rates to the irradiation intensities) of oxygenation were
compared upon porphyrin-photosensitized and direct oxygen
excitation.
© 2005 Chinese Optics Letters
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