Global warming potential assessment for CF₃OCF=CF₂

We have examined CF₃OCF=CF₂ regarding its reactivity toward OH radical, its infrared spectroscopic properties, its atmospheric lifetime, and its radiative forcing. From these we then determined the Global Warming Potentials (GWPs) for CF₃OCF=CF₂. The examination is completed using a combination of discharge flow coupled with mass spectrometer and resonance fluorescence (DF/MS/RF), Fourier transform infrared (FTIR) spectroscopy, ab initio molecular orbital calculation, and atmospheric and radiative transfer modeling. Mass spectral evidence suggests that both HF and CF₃OCFC(O)F are products from the reaction of CF₃OCF=CF₂ with OH. The Arrhenius expression for CF₃OCF=CF₂ + OH is determined to be k₁ = (6.41±0.82)×10^-11exp[(-868±40)/T] cm³ molecule^-1 s^-1 in the temperature range of 253-348 K. The atmospheric lifetime of CF₃OCF=CF₂ is estimated to be less than 5 days due to the OH attack. The calculated vibrational frequencies using ab initio molecular orbital calculations are in good agreement with FTIR experimental observation for the CF₃OCF=CF₂ molecule. Both C-O and C-F stretching modes in the CF₃OCF=CF₂ contribute to prominent absorption in the atmospheric window region. The absolute adjusted radiative forcing at the tropopause due to an increase in the concentration of CF₃OCF=CF₂ by one part per billion by volume (ppbv) is calculated to be 0.041 W m^-2 ppbv^-1. The Global Warming Potential for CF₃OCF=CF₂ is evaluated to be 0.004 for 100-year time horizon.