Fig. 1: Absorption cross-sections of the 363–395 nm section of the B̃(¹A′) ← X̃(¹A′) transition of CH₂OO produced in ethene ozonolysis.

The reaction conditions were initial ozone concentration of 1.8 × 10¹⁵cm⁻³, initial ethene concentration of 1 × 10¹⁷cm⁻³, and residence time of ~140 ms. The laser scanning step was 0.01 nm. The cross-sections in this work (in black) were determined by scaling the absorption coefficient to the reference cross-section data from Foreman et al.³⁴ (in red), and compared to Ting et al.¹⁷ (in blue) and Mir et al.³⁵ (in green), adapted with permission from American Chemical Society and Royal Society Chemistry. The resolution of the reference spectra are labeled. Source data are provided as a Source Data file.