Pulse Radiolysis Studies. XVI. Kinetics of the Reaction of Gaseous Hydrogen Atoms with Molecular Oxygen by Fast Lymanhyphen;agr;Absorption Spectrophotometry

摘要

The pulse radiolysis method has been used to produce groundhyphen;state hydrogen atoms in gaseous hydrogen and has been combined with fast Lymanhyphen;agr;absorption spectrophotometry to observe these atoms directly with microsecond time resolution. The technique has been used to study the kinetics of the reaction Hthinsp;plus;thinsp;O2thinsp;plus;thinsp;Mthinsp;equals;thinsp;HO2thinsp;plus;thinsp;M, where M is H2. The rate constant for this reaction was found to have the valuelpar;1.7thinsp;plusmn;thinsp;0.4rpar;thinsp;times;thinsp;1010Mminus;2middot;secminus;1at 298deg;K. This value, together with earlier data for Ar as third body, giveskH2thinsp;sol;thinsp;kArthinsp;equals;thinsp;2.0at 298deg;K for the ratio of the efficiencies of H2and Ar as third body in this reaction.