  The kinetics of CH$_2$OO reaction with ozone has been studied by monitoring
CH$_2$OO with time-resolved infrared (IR) absorption spectroscopy, which
utilized fast chirped IR pulse train from a quantum cascade laser [J. Chem.
Phys. 146, 244302 (2017)]. CH$_2$OO was prepared by photolyzing a gas mixture
of CH$_2$I$_2$/O$_2$/O$_3$ at 352 nm; the photolysis wavelength was chosen to
minimize the photodissociation of O$_3$. The measured rate coefficient at 298 K
and 30 Torr is (6.7$\pm$0.5)x10$^{-14}$ cm$^3$sec$^{-1}$, independent of
pressure from 30 to 100 Torr. The result indicates that previous ab initio
calculations either underestimated or overestimated this reaction rate by one
order of magnitude or more. The result also implies that in laboratory studies
of ozonolysis of alkenes, the reaction of Criegee intermediate with ozone may
play a role. However, this reaction would not compete with other CH$_2$OO sinks
in the atmosphere.
