Uptake of NH<sub>3</sub> and NH<sub>3</sub> + HOBr Reaction on Ice Surfaces at 190 K
作者:Ronghua Jin、Liang T. Chu
DOI:10.1021/jp073233m
日期:2007.8.1
The uptake of NH3 and the heterogeneous reaction of NH3 + HOBr -> products on ice surfaces at 190 K have been investigated in a flow reactor coupled with a differentially pumped quadrupole mass spectrometer. The uptake coefficient gamma(t) for NH3 was determined to be (3.8 +/- 1.4) x 10(-4) on ice films at 189.8 K, for a partial pressure of NH3 in the range of 7.0 x 10(-7) to 3.8 x 10(-6) torr. The amount of NH3 uptake on the ice film was determined to be > 2.9 x 10(15) molecules/cm(2), based on the total ice surface area at 189.2 K. The heterogeneous reaction of NH3 + HOBr on ice surfaces has been studied at 190 K. The reaction probability gamma(t) was determined to be (5.3 +/- 2.2) x 10(-4) and was found to vary insignificantly as HOBr surface coverage changes from 2.1 x 10(13) to 2.1 x 10(14) molecules/cm(2). A reaction pathway is proposed on the basis of experimental observations.
Risk-Ouaini, R.; Tremblay-Goutaudier, C.; Cohen-Adad, M. T., Journal de Chimie Physique et de Physico-Chimie Biologique, 1993, vol. 90, # 3, p. 579 - 594
作者:Risk-Ouaini, R.、Tremblay-Goutaudier, C.、Cohen-Adad, M. T.