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The visible Chemiluminescence of the NO + O 3  → NO 2 * + O 2  reaction has been studied as a function of collision energy using a supersonic molecular beam of NO. The reaction threshold E 0  = 3.00 ± 0.45 kcal/mol is found to lie significantly below the Arrhenius activation energy of E a  = 4.18 ± 0.3 kcal/mol. This clearly demonstrates the basic difference between the two quantities.

Molecular Beam Chemiluminescence. I. Kinetic Energy Dependence of the NO + O3 → NO2* + O2 Reaction

Molecular Beam Chemiluminescence. I. Kinetic Energy Dependence of the NO + O₃ → NO₂* + O₂ Reaction