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-H2O2v +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.