Spectroscopic studies of the I2/O3 photochemistry

The values of absolute absorption cross sections for selected vacuum wavelengths at 298 K were determined to be: σIO(4←0)(427.2 nm) = (3.5 ± 0.3) × 10−17 cm2, σIO(3←1)(459.3 nm) = (4.5 ± 0.5) × 10−17 cm2, σIO(1←2)(484.9 nm) = (6.0 ± 0.5) × 10−17 cm2, σOIO(0,5,1←0,0,0)(549.3 nm) = (1.3 ± 0.3) × 10−17 cm2 and for an up to now unidentified higher iodine oxide σ(356 nm) ≥ (7.8 ± 1.2) × 10−19 cm2 × I atom−1. The spectral resolution of the resultant absorption cross sections is 0.12 nm FWHM in case of IO and 0.35 nm FWHM in case of OIO. Previous determinations of these absorption cross sections have been reviewed.