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The rate constant for the reaction HO2+O3→OH+2O2 was investigated in a discharge–flow system at room temperature. HO2 was produced from the reaction sequence Cl+CH3OH→CH2OH+HCl and CH2OH+O2→HO2+CH2O. HO2 was detected by the OH(A–X) fluorescence produced from photodissociative excitation of HO2 at 147 nm. A computer modeling of the reaction kinetics occurring in the flow tube was carried out to confirm that contributions from secondary reactions were negligible at low HO2 concentrations. The rate constant was determined from first order decay of HO2 in excess O3. The measured reaction rate constant of HO2+O3 is (1.9±0.3)×10−15 cm3 molecule−1 s−1, which agrees well with published data.

Decay of the first triplet Kr2 excimer in the presence and absence of N2 and effects of N2 on the decay constant and excimer yield at 298 K J. Chem. Phys. 88, 717 (1988); 10.1063/1.454150 Bimolecular and ''threebody'' quenching of paschen1s argon atoms by N2, H2, and O2 and effects of N2 on the yield of the first triplet argon excimer

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021ChemInform Abstract The measured rate constant of reaction A, which is accepted as an important depletion reaction for O3 in the lower stratosphere, is 1.9•10-15 cm3 molecule-1 s-1at 25 rc C and agrees well with published data.

A new set of decay constant values for Ar(3P2) in pure argon at 298 K determined by means of single frequency cw laser probe spectrophotometry in the 100–700 Torr region is reported. An excimer forming mechanism initiated by a reversible termolecular step and carried forward by a sequence of reversible collisional relaxation stages with provision for radiative decay at each stage is proposed to account for the kinetic behavior of Paschen-1s atoms. It is demonstrated that this mechanism is quantitatively consistent with measured collisional decay constant values at pressures in the 0–22 and 100–700 Torr regions and that adherence of such values to form, k3P2=AP2+BP, is fortuitous and that the values of A and B have no mechanistic significance. It is similarly indicated that the nature of the probable decay mechanism precludes the possibility of recovering excited atom precursor decay constant values by analysis of excimer emission and absorption data without detailed numerical modeling.