Abstract
Hitherto unobserved emission hands were detected in the wavelength region of 1 to 2.3 μ when metastable O 2 ( 1 g ) molecules were admixed to the reaction system of O( 3 P ) atoms with hydrocarbons, ammonia, hydrazine, or hydrogen peroxide. The emissions were identified to be vibronic bands of the predicted ( 2 A ′→ 2 A ″) transition of HO 2 radicals and vibrational overtone and combination bands of HO 2 in the 2 A ″ ground state. The excitation of HO 2 was found to proceed mainly by near resonant electronic energy transfer from O 2 ( 1 g ) to HO 2 ( 2 A ″) populating the HO 2 ( 2 A ′, v 3 ′=1) level. As shown in the case of atomic oxygen reactions with ammonia and hydrazine, measuring the HO 2 ( 2 A ′→ 2 A ″) emission after excitation by this energy transfer process can be used to monitor HO 2 radicals in gas phase reaction systems.
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