Experimental and theoretical study of the dissociation energies D0(H2NH) and D0(H2N+H) and other related quantities

Combining the techniques of molecular beam and vacuum ultraviolet synchrotron radiation photoionization mass spectroscopy, we have measured the ionization energy of NH3 (10.16±0.02 eV) and the appearance potentials of H+ (18.57±0.05 eV) and NH2+ (15.75±0.02 eV). From these data, we have obtained dissociation energy values for D0(H2NH) (4.97±0.05 eV), D0(H2N+H) (5.59±0.02 eV) and D0(H2NH+) (8.41±0.05 eV) and the ionization energy IE(NH2) (10.78±0.05 eV). High-level ab initio calculations lead to results that are in good agreement with the experimental findings.