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Area of Science:

  • Atmospheric Chemistry
  • Environmental Science
  • Physical Chemistry

Background:

  • Heterogeneous nitrate photolysis drives polar boundary layer chemistry, often attributed to a quasi-liquid layer (QLL) on ice.
  • The dipole-forbidden electronic transition of nitrates and low yields in ice/water suggest potential surface enhancement and specificity.
  • Understanding ice surface reactions is crucial for polar atmospheric processes.

Purpose of the Study:

  • To investigate the photolysis kinetics of nitrate anions at the ice surface.
  • To provide direct evidence for enhanced photolysis of surface-adsorbed nitrates compared to bulk-dissolved nitrates.
  • To explore the role of ice surface heterogeneity in nitrate photochemistry.

Main Methods:

  • Utilized amorphous solid water films at cryogenic temperatures to model the ice-air interface.
  • Employed vibrational spectroscopy to analyze nitrate structure and photolysis rates.
  • Developed a 1D kinetic model to simulate NO2 emissions.

Main Results:

  • Demonstrated that nitrates adsorbed on the ice surface are photolyzed more effectively than those in the bulk.
  • Observed a ~3-fold enhancement in photolysis rates for surface nitrates, linked to distorted intramolecular geometry.
  • Kinetic modeling indicated significant NO2 emissions originating from the ice surface layer.

Conclusions:

  • Nitrate photolysis is significantly enhanced at the ice surface, challenging the necessity of a QLL.
  • Surface-adsorbed nitrates play a critical role in polar atmospheric chemistry and pollutant release.
  • Findings suggest a new framework for understanding heterogeneous photochemistry on ice below QLL formation temperatures.