LIF‐Measurements of the Dynamics of the Reactions HT (2.57 eV) + NO → OH + N and HT (1.86 eV) + O2 → OH + O

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AbstractTranslationally “hot” H atoms from photolysis of HBr and HCl at 193 nm, were used to investigate the reaction dynamics of H + NO → OH + N and H + O2 → OH + O. Nascent OH rotational and fine structure distributions were measured by LIF. For both reactions, a high degree of rotational excitation was found. Spin‐orbit states Π1/2 and Π3/2 were found to be equally populated. The lambda‐doublet distributions show a preference for the symmetrical OH‐Π:(A′) component. With a calibration method using H2O2 photolysis as a well defined source of OH radicals, absolute reactive cross sections at translational energies of 2.57 eV and 1.86 eV, respectively, could be determined: σH + NO = (0.01 ± 0.005) Å2 and σH + O2 = (0.34 ± 0.20) Å2.