Ab initio study of AgNH3 and its cation

Ab initio calculations are performed for AgNH3 and Ag+NH3 at the MP2 level of theory. The equilibrium structures show C3v symmetry, the AgNH3 (Ag+NH3) stabilization energy is 0.20 eV (2.00 eV). The frequencies of the silver-ammonia stretching and bending vibrations are calculated. The theoretical value of the adiabatic ionization potential (5.82 eV) is in good agreement with recent experimental data.