Specific features of the kinetics of H2-O2-O2(a 1Δ g ) mixtures: I. formation and quenching of electronically and vibrationally excited (A′) molecules in H2-O2-O2(A 1Δ g ) mixtures at a temperature of 300 K

Available data on the kinetic processes in H-2-O-2-O-2(a (1)Delta (g) ) mixtures are analyzed theoretically, and the ranges in which the rate constants of these processes can vary are determined. The processes of energy transformation in an O-2(a (1)Delta (g) )-H-2-H-HO2 system in the approximations of the fast and slow (in comparison with the vibrational relaxation time of the HO2 radical) quenching of the electronically excited state are considered. The experiments on the quenching of singlet delta oxygen (SDO) molecules O-2(a (1)Delta (g) ) excited in a microwave discharge at a temperature of 300 K and pressure of 6 Torr in a lean hydrogen-oxygen mixture are simulated (by a lean fuel mixture is meant a mixture in which the ratio of the fuel to the oxidizer mass fraction is less than the stoichiometric ratio, which is 2: 1 for a hydrogen-oxygen mixture). It is shown that, over the experimental observation times, the SDO quenching frequency depends on the concentration of molecular hydrogen, the residual odd oxygen fraction in the gas flow, and the ratio between the rate constants of kinetic processes involving HO2 and HO2* radicals. Simulations of the microwave discharge and the transport of excited oxygen along the drift tube make it possible to determine the residual odd oxygen concentration in the gas flow. Recommendations on the choice of the rate constants for the O-2(a (1)Delta (g) ) + HO2)AaEuro(3), v(3)aEuro(3) = 0) a dagger O-2 + HO2*(A', v(3)' = 1), HO2*(A'v(3)' a parts per thousand currency sign 1) + O-2(a (1)Delta (g) ) -> HO2*(A',v(3)' a parts per thousand yen 6) + O-2, and HO2*(A',v(3)' a parts per thousand currency sign 1) + O-2(a (1)Delta (g) ) -> H + O-2 + O-2 processes are given. It is shown that, in the case of slow quenching in a H-2-O-2-O-2(a (1)Delta (g) ) mixture at a low temperature, the intensity of hydrogen oxidation is enhanced due to the reaction + HO2*(A',v(3)' a parts per thousand currency sign 1) + O-2((1)Delta) -> H + O-2 + O-2.