Untersuchungen zur Reaktion OH + HO2 → H2O + O2 mit Hilfe eines Laser‐Magnetischen Resonanz‐Spektrometers

The reaction OH + HO2 → H2O + O2 (1) was studied at room temperature in several isothermal discharge‐flow reactors. OH‐ and HO2‐radicals and O‐atoms were monitored with an optically pumped lmr‐spectrometer. The radicals were produced by the reaction F + H2O → OH + HF and OH + HO2 H2O, F + H2O2 → HO2 + HF or H + O2 + M → HO2 + M, respectively. The influence of side reactions due to the presence of H2O2 or the possible presence of O‐ or H‐atoms with small concentrations was investigated and eliminated or taken into account by using suitable reaction conditions. The rate constant at room temperature was found to be k1 (296 K) = (4.0 ± 1.4) · 1013 cm3/mol s. In the range 2 mbar ≤ p ≤ 14 mbar k1 is invariant with pressure.