Abstract
In view of the current disagreement in the literature over the absolute UV absorption cross-sections of the hydroperoxy radical HO 2, the room temperature spectrum of this species has been redetermined relative to the well-established maximum of the spectrum of the methylperoxy radical CH 3O 2. The results obtained are in good agreement with previous work in this laboratory, with σ(HO 2, 210 nm)/σ(CH 3O 2, 240 nm) = 1.06 ± 0.02, giving σ(HO 2, 210 nm) = (4.81 ± 0.49) × 10 −18 cm 2 molecule −1. In addition, the dependence of the form of the HO 2 and CH 3O 2 spectra on temperature has been determined at temperatures up to 777 K. Simple analytical expressions are presented which allow the cross-sections of HO 2 and CH 3O 2 to be calculated as a function of wavelength and temperature.
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