Rate coefficients for the chemical reactions of CH2F2, CHClF2, CH2FCF3 and CH3CCl3 with O(1D) at 298 K

Abstract

The rate coefficients for the chemical reactions (species loss rates, quenching excluded) of the refrigerants CH2F2 (HFC-32), CHClF2 (HFC-22) and CH2FCF3 (HFC-134a), and the solvent CH3CCl3 with O(1D) are determined relative to CH4+O(1D) at 298K. The resulting rates k(CH2F2+O(1D))=(4.78±1.03)×10−11cm3molecule−1s−1, k(CHClF2+O(1D))=(8.69±1.72)×10−11cm3molecule−1s−1, k(CH2FCF3+O(1D))=(6.10±1.43)×10−11cm3molecule−1s−1 are compared to available literature data. The reaction rate of 1,1,1-trichloroethane with O(1D) is determined for the first time, k(CH3CCl3+O(1D))=(2.93±1.20)×10−10cm3 molecule−1s−1.