Add time:08/13/2019         Source:sciencedirect.com

The dissociative electroionization of NH3 (ND3), in the NH2+ (ND2+) dissociation channels, is investigated in the 15–50 eV electron energy range. The translational energy distributions of ND2+ (NH2+) exhibit several components, whereas NH+only shows a continuous, broad distribution. For both ions a kinetic energy versus appearance energy diagram is obtained and discussed. The predissociation of the Jahn-Teller split NH3+ (Ã, 2E) state produces both ions at their lowest threshold. At higher energies, dissociative autoionization (in the 22 eV region), dissociative ionization through the NH3+ (B̃ 2A1 state in (the 24–30 eV region) as well as dissociation by Coulomb repulsion of doubly ionized states (in the 35–50 eV region) produce NH2+ (ND2+) and NH+ with large amounts of translational energy. Some arguments are brought forward to indicate that the former value of the NH2-H dissociation energy is overestimated.

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