1. Hydrogen chloride-induced surface disordering on ice.
- Author
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McNeill, V. Faye, Loerting, Thomas, Geiger, Franz M., Trout, Bernhardt L., and Molina, Mario J.
- Subjects
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HYDROGEN chloride , *OZONE-depleting substances , *SURFACES (Technology) , *ICE , *SPECTRUM analysis , *MASS spectrometry - Abstract
Characterizing the interaction of hydrogen chloride (HCI) with polar stratospheric cloud ice particles is essential for understanding the processes responsible for ozone depletion. We studied the interaction of gas-phase HCI with ice between 243 and 186 K by using (I) ellipsometry to monitor the ice surface and (ii) coated-wall flow tube experiments, both with chemical ionization mass spectrometry detection of the gas phase. We show that trace amounts of HCI induce formation of a disordered region, or quasi-liquid layer, at the ice surface at stratospheric temperatures. We also show that surface disordering enhances the chlorine activation reaction of HCI with chlorine nitrate (ClONO2) and also enhances acetic acid (CH3COOH) adsorption. These results impact our understanding of the chemistry and physics of ice particles in the atmosphere. [ABSTRACT FROM AUTHOR]
- Published
- 2006
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