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| Titel |
FTIR spectroscopic studies of the simultaneous condensation of HCl and H2O at 190 K – Atmospheric applications |
| VerfasserIn |
I. Xueref, F. Domine |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 3, no. 5 ; Nr. 3, no. 5 (2003-10-27), S.1779-1789 |
| Datensatznummer |
250001277
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| Publikation (Nr.) |
 copernicus.org/acp-3-1779-2003.pdf |
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| Zusammenfassung |
| Type II polar stratospheric cloud particles are made up of ice that forms by water vapor condensation
in the presence of numerous trace gases, including HCl. These gaseous species can co-condense with
water molecules and perturb ice structure and reactivity. In order to investigate the effect of co-condensing
dopants on the structure of ice, we have designed an experimental system where ice
films can be stabilized at 190 K, a temperature relevant to the polar stratosphere. We have co-condensed
different HCl:H2O gaseous mixtures, with ratios 5:1, 1:10, 1:50 and 1:200 and studied the
solids formed by infrared spectroscopy. The IR spectra obtained show that: (1) HCl is likely
undergoing ionic dissociation when it is incorporated by co-condensation into the ice at
190 K; (2) this dissociation is done by several water molecules per HCl molecule; and (3) significant
differences between our spectra and those of crystalline solids were always detected, and indicated
that in all cases the structure of our solids retained some disorganized character. Considering the
major impact of HCl on ice structure observed here, and the well known impact of the structure of
solids on their reactivity, we conclude that the actual reactivity of stratospheric ice particles, that
catalyze reactions involved in ozone depletion, may be different from what has been measured in
laboratory experiments that used pure ice. |
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