2ème atelier international
J. Phys. IV France 05 (1995) C4-417-C4-422
Rearrangements of Ammonium Nitrate Cluster Ions with High Internal EnergyR.J. Doyle and B.I. Dunlap
Chemistry Division, Naval Research Laboratory, Washington, DC 20375, U.S.A.
Sputtering of condensed-phase ammonium nitrate yields an extensive distribution of negative cluster ions of the form [(NH4NO3)nNO3]-, n≥3. Collision-induced dissociation of mass-selected cluster ions suggests that the first two members of the series, n = 1 and n = 2, are missing because the ions rearrange to lose one or more ammonia molecules. Gradient-corrected density-functional calculations show that NH4NO3 is strongly hydrogen bonded and that [(NH4NO3)NO3]- has no hydrogen bonds, consistent with this ion rearranging to lose NH3 to form the strongly hydrogen-bonded ion [H(NO3)2]-.
© EDP Sciences 1995