Hechenberger F, Kollotzek S, Ballauf L, Duensing F, Ončák M, Herman Z, Scheier P. Formation of HCN
+ in collisions of N
+ and N
2+ with a self-assembled propanethiol surface on gold.
Phys Chem Chem Phys 2021;
23:7777-7782. [PMID:
33015698 DOI:
10.1039/d0cp04164e]
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Abstract
Collisions of N+ and N2+ with C3 hydrocarbons, represented by a self assembled monolayer of propanethiol on a polcrystalline gold surface, were investigated by experiments over the incident energy range between 5 eV and 100 eV. For N+, formation of HCN+ is observed at incident energies of projectile ions as low as 20 eV. In the case of N2+ projectile ions, the yield of HCN+ increased above zero only at incident energies of about 50 eV. This collision energy in the laboratory frame corresponds to an activation energy of about 3 eV to 3.5 eV. In the case of N+ projectile ions, the yield of HCN+ was large for most of the incident energy range, but decreased to zero at incident energies below 20 eV. This may indicate a very small energy threshold for the surface reaction between N+ and C3 hydrocarbons of a few tenths of an eV. Such a threshold for the formation of HCN+ may exist also for collisions of N+ with an adsorbed mixture of hydrocarbon molecules.
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