Observation of O(1D) produced from photodissociation of HO2 at 193 and 248 nm

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Abstract
The photodissociation processes of HO2 were investigated, using ArF and KrF laser photons. HO2 was produced by a three‐body reaction: H+O2+He→HO2+He. The primary products from HO2 photodissociation are O(1D)+OH(X 2Π). O(1D) then transfers its energy to O2 to form O2(b 1Σ+g), giving emission at 7620 Å. This O2 emission band is identified both from its wavelength and its rates of quenching by various gases. The O(1D) production is confirmed by its quenching rates with N2 and Xe. The cross section for the production of O(1D) at 248 nm is larger than that at 193 nm by a factor of 3. The electronic states and photodissociation processes of HO2 that lead to the production of O(1D)+OH(X 2Π) are discussed.