ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The HO2 self-reaction HO2+HO2→H2O2+O2 was studied in shock waves between 750 and 1120 K. Two different HO2 sources were used, the thermal dissociation of CH3O2CH3 in the presence of excess O2 and the thermal dissociation of H2O2. The reaction is characterized by a curved Arrhenius plot of the rate constant k. The combination with low temperature data shows a deep minimum of k near 700 K. The rate constant, at 1 bar gas pressure, between 300 and 1100 K can be represented as k/cm3 mol−1 s−1=4.2×1014 exp(−6030 K/T) +1.3×1011 exp(+820 K/T). The first term in the present work was derived from measured ratios of k/ε and was evaluated with ε (HO2, 230 nm, 1000 K)=670 1 mol−1 cm−1. Furthermore, a value of the rate constant of 3×1012 cm3 mol−1 s−1 was derived near 1100 K for the reaction HO+H2O2→HO2+H2O; for the reaction HO+HO2→H2O+O2 a value of 3×1013 cm3 mol−1 s−1 was obtained.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.459102
