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Radioactively labeled trace gases have been successfully used to study heterogeneous chemistry of atmospheric relevance. Here we present a new synthesis of gas-phase peroxynitric acid labeled with   13 N (H 13 NO 4 ) to study the interaction of HNO 4  with ice and snow surfaces. A yield of about 30% for HNO 4  was determined. The main by-products were HNO 3  and HNO 2 . Exposure of an ice packed bed flow tube to these species revealed that the interaction with the surface scale in the order HNO 3 ߙ&gt;ߙHNO 4 ߙ=ߙHNO 2 ߙ&gt;ߙNO 2 .

A novel synthesis of the N-13 labeled atmospheric trace gas peroxynitric acid