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Laboratory studies of sticking coefficients and heterogeneous reactions important in the Antarctic stratosphere
Author(s) -
Leu MingTaun
Publication year - 1988
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl015i001p00017
Subject(s) - stratosphere , ozone depletion , quadrupole mass analyzer , ozone , nitric acid , mass spectrometry , analytical chemistry (journal) , trace gas , chemical reaction , atmospheric sciences , atmospheric chemistry , ionization , chemistry , environmental chemistry , inorganic chemistry , physics , organic chemistry , ion , chromatography
Laboratory studies of sticking coefficients of H 2 O, HCl, Cl 2 and HNO 3 on ice and heterogeneous reactions of ClONO 2 with ice or HCl/ice have been performed in a fast flow reactor. A quadrupole mass spectrometer with electron impact ionization was used as a detector. Measured sticking coefficients are: 0.3 (+0.7. −0.1) for H 2 O, 0.4 (+0.6, −0.2) for HCl, <1.0 × 10 −4 for Cl 2 , and 0.3 (+0.7, −0.1) for HNO 3 at 200 K. The reaction probability of ClONO 2 on ice was found to be 0.06 (±0.03) while HOCl was observed as a sole product in the gas phase. With HCl present in ice, the reaction probability of ClONO 2 is greatly enhanced, approaching 0.27 (+0.73, −0.13) while molecular chlorine was found to be the major product in the gas phase. Another reaction product was nitric acid which remained in the solid phase. Since the polar stratospheric clouds contain ice particles or possibly HCl/ice particles on the surface, the present results should be a major factor in producing the observed springtime ozone depletion in the Antarctic stratosphere.