Absolute reactive cross section and oh product state distribution for the reaction H(1.86 eV)+CO 2→OH+CO

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Photolysis of HCl with an ArF excimer laser at 193 nm yields H atoms with well-defined high translational energy (1.86 eV) which react with CO 2 to form OH and CO. The product OH radicals are detected by laser-induced fluorescence (LIF). From LIF spectra the nascent OH vibrational, rotational and fine-structure state distributions were determined. OH translational energy was obtained from line profiles. With a calibration method using H 2O 2 photolysis as a reference an absolute reactive cross section of 0.4±0.2 Å 2 has been measured. The results are compared to previous experimental and theoretical work on H+CO 2 at different collision energies.