Spectroscopic measurement of the rate of the gas-phase combination of methyl radicals with nitric oxide and oxygen at 295 K

Abstract

The rates of combination of CH₃ with NO and O₂ were measured by flash spectroscopy at 295 K. The high-pressure rate coefficient for CH₃+ NO(+M)→CH₃NO(+M) was recorded as 1.0(±0.15)× 10¹³ cm³ mol^–1 s^–1. The low-pressure fall-off was interpreted with the Rice-Marcus model for D₀(CH₃—NO)= 46.8 kcal mol^–1. The high pressure rate coefficient for CH₃+ O₂(+M)→CH₃O₂(+M) was deduced to be approximately 1.1 × 10¹² cm³ mol^–1 s^–1.