CH2OO Criegee biradical yields following photolysis of CH2I2 in O2.

Yields of CH2OO and CH2IO2 from the reaction of CH2I radicals with O2 are reported as a function of total pressure, [N2] and [O2] at T = 295 K using three complementary methods. Results from the three methods are similar, with no observed additional dependence on [O2]. The CH2I + O2 reaction has a yield of ∼18% CH2OO at atmospheric pressure.