Uptake of HCl in water ice and nitric acid ice films
- California Inst. of Technology, Pasadena (United States)
The uptake of HCl in water ice and nitric acid ice films has been investigated in a flow reactor interfaced with a differentially pumped quadrupole mass spectrometer. These studies were performed under experimental conditions that may mimic the polar stratosphere. The HCl uptake in ice films at 188 and 193 K was determined to be in the range of 8.7 [times] 10[sup 13] to 1.8 [times] 10[sup 15] molecules/cm[sup 2] (if the geometric area of the flow reactor, 290 cm[sup 2], was used in the calculation) when HCl partial pressures of 7 [times] 10[sup [minus]8] to 6 [times] 10[sup [minus]6] Torr were used. On the basis of a model which accounts for the total surface area of the films, the true surface density could be a factor of 25 lower than that calculated by the geometric area. A slightly higher uptake was observed at the lower temperature of 188 K. The uptake of HCl in ice was significantly enhanced by using an HCl partial pressure greater than 1 [times] 10[sup [minus]5] Torr. The observation was found to be consistent with the formation of the hexahydrate or the trihydrate of HCl according to the phase diagram of the HCl/H[sub 2]O system. 41 refs., 7 figs., 2 tabs.
- OSTI ID:
- 5998904
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:29; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ANTARCTIC REGIONS
CHEMICAL REACTIONS
CHEMICAL REACTORS
CHLORINE COMPOUNDS
CLOUDS
CRYOSPHERE
HALOGEN COMPOUNDS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
ICE
INORGANIC ACIDS
LAYERS
MASS SPECTROSCOPY
NITRIC ACID
OZONE LAYER
POLAR REGIONS
SPECTROSCOPY
UPTAKE