Electronic states of doubly ionized ammonia

摘要

The ionization potentials corresponding to the formation of the lowesthyphen;lying states of doubly ionized ammonia have been measured by double charge transfer spectroscopy, the translational energy analysis of Hminus;ions arising from double charge transfer between 4 keV protons and NH3. SCFsngbnd;CI calculations have been carried out for the lowest lying states ofNH3plus;plus;at the equilibrium geometry of the neutral molecule. The assignment of the experimental energy values to given states ofNH3plus;plus;is discussed. Fairly good agreement between experimental and calculated double ionization potentials is obtained.