The time-resolved absorption spectrum of singlet molecular oxygen (a 1 Δ g → b 1 Σ g + ) has been recorded in liquid D 2 O using a step-scan Fourier transform spectrometer. A molar absorption coefficient of 6 ± 2 M -1 cm -1 was determined for the peak of the absorption band at 5228 ± 6 cm -1 . In this report, issues pertinent to the detection of this signal are outlined. Specifically, for O 2 (a 1 Δ g ) produced upon pulsed laser irradiation of a sensitizer, it is necessary to account for a laser-induced, temperature-dependent shift in a D 2 O absorption band that interferes with the weak a → b signal. Along with a → b absorption coefficients obtained previously in other solvents, the D 2 O data reported herein enable an appropriate test of a topical model for the perturbing effect of solvent on radiative transitions in oxygen.
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Andersen et al. (2002) studied this question.
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