The unimolecular decomposition rate constant of CF3O2NO2 has been measured in detail as a function of temperature, pressure, and collision partner (M= N2, O2, NO). Temperatures were between 264 and 297 K, and total pressures ranged from 3 to 1013 mbar. The first- order decay of CF3O2NO2 in the presence of excess NO was followed in a temperature- controlled DURAN glass chamber by long-path IR absorption, using the absorption bands ...