Fig. 4. Effects of NO on product distributions from OH oxidation of decalin, cyclohexane and n-decane in the Leipzig flow reactor.

a The experimentally measured molar yields of products with at least 4, 5, or 6 O-atoms, respectively, are given as different line types, while the precursor alkanes each have separate line colors. The molar yield of products with at least 6 O-atoms from n-decane oxidation is multiplied by 10 for clarity. The data points were measured at NO concentration of 4.7 × 10⁹, 3.1 × 10¹⁰, 6.1 × 10¹⁰, 9.2 × 10¹⁰, 1.2 × 10¹¹, 1.8 × 10¹¹, and 2.4 × 10¹¹ molecules/cm³, respectively. We note that this connection between NO and HOM yield should not be applied directly to the atmosphere, as the exact relations depend strongly on experimental conditions. The mass spectra, measured as adducts with ethylaminium, at the highest NO addition of 2.4 × 10¹¹ molecules cm⁻³ are plotted separately for b decalin, c cyclohexane, and d n-decane. In each spectrum, radicals are in red, nitrates in blue, and other closed shell compounds, mainly carbonyls, in black.