AbstractThe absolute rate constants for the reactions of OH + HO2NO2(1) and OH + HNO3(2) have been measured with the technique of flash photolysis resonance fluorescence over the temperature ranges of 240–330 K at 760 torr He for reaction (1) and of 240–370 K at 50 and 760 torr He for reaction (2). Reactant concentrations were monitored continuously by ultraviolet and infrared spectrophotometry. The data can be fitted to the following Arrhenius expressions:\documentclass{article}\pagestyle{empty}\begin{document}$$ k_1 = \left( {5.9 \pm 0.4} \right) \times 10^{ - 13} \exp \left[ {{{\left( {650 \pm 30} \right)} \mathord{\left/ {\vphantom {{\left( {650 \pm 30} \right)} T}} \right. \kern-\nulldelimiterspace} T}} \right]{{{\rm cm}^{\rm 3} } \mathord{\left/ {\vphantom {{{\rm cm}^{\rm 3} } {{\rm molecule} \cdot {\rm s}}}} \right. \kern-\nulldelimiterspace} {{\rm molecule} \cdot {\rm s}}} $$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm CH}_{\rm 3} {\rm SiD}_{\rm 3} \mathop {\longrightarrow} \limits^3 {\rm CH}_{\rm 2} \raise1pt\hbox{=\kern-3.45 pt=} {\rm SiD}_{\rm 2} \left( {0.14} \right) $$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$ k_2 = \left( {8.3 \pm 0.9} \right) \times 10^{ - 15} \exp \left[ {{{\left( {850 \pm 40} \right)} \mathord{\left/ {\vphantom {{\left( {850 \pm 40} \right)} T}} \right. \kern-\nulldelimiterspace} T}} \right]{{{\rm cm}^{\rm 3} } \mathord{\left/ {\vphantom {{{\rm cm}^{\rm 3} } {{\rm molecule} \cdot {\rm s}}}} \right. \kern-\nulldelimiterspace} {{\rm molecule} \cdot {\rm s}}} $$\end{document}These results are in very good agreement with recent studies of reaction (2), and also of reaction (1) at 29