State-selected studies of the reaction of NH 3 + ( ν 1 , ν 2 ) with D 2

The title reaction has been studied in a guided ion beam instrument at hyperthermal energies, resulting in ion products NH 3 D + and NH 2 D +. Ammonia ions were prepared with differing amounts of excitation in the in-plane symmetric stretching ( ν 1 ) and the out-of-plane symmetric bending mode ( ν 2 ) using 2+1 resonance-enhanced multiphoton ionization. Comparison of the reactivity of two nearly isoenergetic states ( ν 1 =0, ν 2 =5; internal energy, E int =0.60 eV and ν 1 =1, ν 2 =2; E int =0.63 eV) with differing concerted atom motions indicates that this reaction is not mode selective.