Adsorbed water and heterogeneous processes on NaCl
- Indiana Univ., Bloomington, IN (United States)
There are adsorbed layers of water on most particles in the troposphere even under and conditions. These layers display properties unique from bulk water and they influence heterogeneous processes of importance in the atmosphere such as nucleation and chemical transformations. Thus it is of importance to understand the physical and chemical properties of these adsorbed water layers. Here we consider water on the most abundant particles in the earth`s atmosphere-sea salt. Our model system is the NaCl(100) face where we explore, by polarized infrared spectroscopy, the coverage and orientation of adsorbed H{sub 2}O under ambient conditions. How the adlayer structure changes from a single monolayer to multilayers, that lead to salt dissolution, is monitored spectroscopically. The influence of adsorbed water layers on the chemical transformation of NaCl to NaNO{sub 3} by NO{sub 2} will be discussed. Finally we show how defects provide sites from chemical reaction of water at the salt surface.
- OSTI ID:
- 370171
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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