Abstract
The reaction ClONO 2+HCl → Cl 2+HNO 3 on ice surfaces was investigated using a fast flow reactor coupled to a chemical ionization mass spectrometer. Rough and relatively smooth ice surfaces and single-crystal ice particles were employed to investigate the effect of the different surface morphologies on the reaction mechanism. Large reaction probabilities ( γ>0.1), independent of HCl partial pressure in the range from 2×10 −7 to 8×10 −6 Torr, were measured on these three ice surfaces. These results are consistent with an ionic reaction mechanism involving HCl solvation on a liquid-like surface layer.
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