The large shifts (minus;30.5 and +41.7 cmminus;1, respectively) of the IR absorption lines of nitric acid (HONO2) in a N2matrix in the ngr;1(OH stretching) and ngr;3(HON bending) vibrational modes, relative to those observed for HONO2in an Ar matrix, indicate a strong interaction between HONO2and N2. Photolysis of HONO2in solid Ar produced predominantly HOONO, whereas relatively intense lines of N2O and HONO were observed after photolysis of HONO2in solid N2with a mercury lamp, with the relative yield of HOONO decreased by more than a factor of 10. Possible photochemical processes are discussed.
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