The dissociative electroionization of ammonia and AMMONIA-D3 (cas 13550-49-7). II. The H+ and H2+ dissociation channels

Add time:08/12/2019    Source:sciencedirect.com

The dissociative electroionization of NH3 (ND3), in the H+ (D+) and H2+ (D2+) dissociation channels, is investigated in the 18–50 eV electron energy range. The H+ (D+) translational energy distribution spectrum shows several components and that of H2+ (D2+) is continuous. The thermal energy component of the latter distribution is entirely ascribed to H2+ /H2. For both ions the kinetic energy versus appearance energy diagram is obtained and discussed. The H+ ion at the lowest onset is probably formed at the expense of NH3+ (Ã 2E) state. In the 22.5 eV electron energy range both H+ and H2+ are formed by dissociative autoionization.Evidence is also brought for H+ and H2+ formation at 22.5 and 26.5 eV through spontaneous decomposition of NH2+. Above 35 eV dissociation of doubly ionized states by Coulomb repulsion is mainly involved.

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