CompressorElectron pulse radiolysis at 298°K of 2 atm H 2 containing 5 torr O 2 produces HO 2 free radical whose disappearance by reaction (1), HO 2 + HO 2 →H 2 O 2 + O 2 , is monitored by kinetic spectrophotometry at 230.5 nm. Using a literature value for the HO 2 absorption...