Reflection absorption infrared spectroscopy (RAIRS) and temperature programmed desorption (TPD) were used to investigate the formation and dissociation of the NH species on the Pt(111) surface. NH, N, and H can be produced by irradiating molecularly adsorbed NH₃ with a 100 eV electron beam at 85K. The formation of the NH species is indicated by the appearance of an intense peak at 3320 cm^-1. The increase in intensity of this peak upon heating the surface from 85 to 380 K indicates the formation of NH from adsorbed N and H atoms. This formation follows second order kinetics at 220K. The NH species is stable up to 400 K and then it dehydrogenates leaving N on the surface, which was stable up to 700K. This adsorbed N can be rehydrogenated to NH by exposing to H₂ at 300K. The maximum NH coverage of 0.2 monolayer is achieved with a 0.4L NH₃ exposure.