10min:

N. M. RUBTSOV, G. I. TSVETKOV AND V. I. CHERNYSH, Institute for Structural Macrokinetics and Material Science of Russian Academy of Sciences, 142432, Russian Federation, Noginski region, Chernogolovka.

Band system in the region 852 - 880 nm and bands 670 and 846 nm over pressures 0.1 - 1 atm in the flames of mixtures of hydrogen with oxygen and air has been detected. The system is assigned to overtone transitions of H₂O₂ (3 ₁+ ) correspondingly arising from the reaction of HO₂+HO₂-H₂O₂^v +O₂ +33.5 kcal/mole. The bands 670 and 846 nm are assigned to overtone transitions of HO₂ radical (4 ₁+ ) and (3 ₁+ ) correspondingly arising from the reaction of H+O₂(+M)-HO₂(+M) + 44 kcal/mole. By this means the extent of energy of these elementary processes is located in vibrational degrees of freedom of products. It has been detected that HO₂ radicals occur originally in overtone-excited states in combustion both of hydrogen and deuterium in the presence of small additives of propylene as an inhibitor.