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Related Experiment Videos

Hydrogen chloride-induced surface disordering on ice.

V Faye McNeill1, Thomas Loerting, Franz M Geiger

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 14, 2006
PubMed
Summary

Trace amounts of hydrogen chloride (HCl) create a disordered surface layer on ice particles at stratospheric temperatures. This surface change accelerates ozone depletion reactions and enhances the adsorption of other atmospheric compounds.

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Area of Science:

  • Atmospheric Chemistry
  • Surface Science
  • Ozone Layer Dynamics

Background:

  • Polar stratospheric clouds (PSCs) play a critical role in ozone depletion.
  • Understanding the interaction of gases like hydrogen chloride (HCl) with PSC ice is crucial.

Purpose of the Study:

  • To investigate the interaction of gas-phase HCl with ice surfaces at stratospheric temperatures.
  • To determine how HCl affects the physical state and chemical reactivity of ice particles.

Main Methods:

  • Utilized ellipsometry to monitor changes in the ice surface.
  • Employed coated-wall flow tube experiments to study gas-phase reactions.
  • Used chemical ionization mass spectrometry for gas-phase detection.

Main Results:

Related Experiment Videos

  • Observed the formation of a quasi-liquid layer (surface disordering) on ice induced by trace HCl at temperatures between 243 and 186 K.
  • Demonstrated that this surface disordering significantly enhances the reaction rate of HCl with chlorine nitrate (ClONO2).
  • Found that the disordered surface also increases the adsorption of acetic acid (CH3COOH).

Conclusions:

  • HCl interaction with ice particles leads to surface structural changes relevant to stratospheric conditions.
  • Enhanced reactivity at the ice surface due to HCl is a key factor in chlorine activation and ozone depletion.
  • These findings refine models of polar atmospheric chemistry and PSC behavior.