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Interaction of NH$_3$$^{+}$ (ND$_3$$^{+}$) and NH$^{+}$ with ahydrocarbon-covered tungsten surface kept at room temperature and heated to150{\deg}C and 300{\deg}C showed a series of reactions between the projectileion and hydrocarbons adsorbed on the tungsten surface. Collisions with NH3+ andparticularly with ND3+ showed formation of NH$_4$$^{+}$, HCNH$^{+}$, andCH$_2$NH$_2$$^{+}$ and ND$_3$H+, HCND$^{+}$, and CH$_2$ND$_2$$^{+}$,respectively, with NH$_4$$^{+}$ (ND$_3$H$^{+}$) strongly prevailing at lowincident energies of the projectile ion. No formation of HCN$^{+}$ (DCN$^{+}$)could be positively identified. In reactions with NH$^{+}$ formation ofHCN$^{+}$ was clearly observed; the dependence of the HCN$^{+}$ normalized ionyield on incident energy seems to indicate a threshold at about 40 eV which maybe due to an activation energy or an endothermicity of the surface reaction ofabout 2.4-3.2 eV.

international journal of mass spectrometry

Heterogeneous reactions between ions NH$_3$$^{+}$ and NH$^{+}$ and  hydrocarbons adsorbed on a tungsten surface. Formation of HCN$^{+}$ in  NH$^{+}$-surface hydrocarbons collisions