Pressure and Temperature Dependence of the Gas-Phase Reaction of SO3 with H2O and the Heterogeneous Reaction of SO3 with H2O/H2SO4 Surfaces

摘要: The gas-phase reaction of SO3 with H2O and the heterogeneous H2O−H2SO4 surfaces have been studied in a fast flow reactor coupled to chemical ionization mass spectrometer (CIMS) for species detection. was under turbulent conditions over pressure range from 100 760 Torr N2 temperature 283 370 K. loss rate measured pseudo-first-order conditions; it exhibits second-order dependence on water vapor concentration has strong negative dependence. first-order coefficient by shows no significant can be expressed as kI(s-1) = 3.90 × 10-41 exp(6830.6/T)[H2O]2 where [H2O] is units molecule cm-3 T Kelvin. overall uncertainty our experimentally determined coefficients estimated ±20%. At sufficiently low concentrations (<1012 cm-3) independent init...