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Gas-particle reactions of reactive nitrogen represent an important but variable atmospheric chemical cycle.  For example, uptake of N₂O₅to aerosol regulates the lifetime of NO_x(=NO+NO₂) and oxidant burdens in the troposphere.  Uptake of N₂O₅to chloride-containing aerosol to produce ClNO₂is an efficient halogen activation mechanism that may represent a substantial fraction of tropospheric halogen budgets.  Our group has developed instrumentation and led major ground, ship and aircraft based field intensives in , , , ,  and .  The recent  field campaign on the NSF C-130 aircraft on the U.S. East Coast, collaborative with the  at the University of Washington, specifically targeted heterogeneous nitrogen chemistry.