title: Potential role of the nitroacidium ion on HONO emissions from the snowpack.
abstract: The effects of photolysis on frozen, thin films of water-ice containing nitrogen dioxide (as its dimer dinitrogen tetroxide) have been investigated using a combination of Fourier transform reflection-absorption infrared (FT-RAIR) spectroscopy and mass spectrometry. The release of HONO is ascribed to a mechanism in which nitrosonium nitrate (NO+NO3-) is formed. Subsequent solvation of the cation leads to the nitroacidium ion, H2ONO+, i.e., protonated nitrous acid. The pathway proposed explains why the field measurement of HONO at different polar sites is often contradictory.
authors.forename: Stig
authors.initials: S
authors.lastname: Hellebust
authors.forename: Tristan
authors.initials: T
authors.lastname: Roddis
authors.forename: John R
authors.initials: JR
authors.lastname: Sodeau