science-softCon uv/vis+ photochemistry database; www.photochemistry.org; (C) science-softCon 2019 Substance: hydroperoxyl radical Other names: Formula: HO2 CAS-No.: 3170-83-0 Study: uv absorption spectra Authors: P.D. Lightfoot, A.A. Jemi-Alade Title: The temperature dependence of the UV spectra of the HO2 and CH3O2 radicals Journal/Source: J. Photochem. Photobiol. A: Chem., 59, 1-10, (1991); http://dx.doi.org/10.1016/1010-6030(91)87062-Z Data: table, diagram Energy/Wavelength range: 210 - 250 nm Resolution: 10 nm Temperature: 298 K Temperature dependence: yes Pressure/Concentration: Phase: pH: Comments: The results obtained are in good agreement with previous work in this laboratory, with sigma(HO2, 210 nm)/sigma(CH3O2, 240 nm) = 1.06 ± 0.02, giving sigma(HO2, 210 nm) = (4.81 ± 0.49) × 10-18 cm2 molecule-1. The dependence of the form of the HO2 and CH3O2 spectra on temperature has been determined at temperatures up to 777 K. Author to whom correspondence should be addressed: (e-mail address):