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• W2012507314 abstract "The surface field must play an important role in the reactivity of a surface. This effect can be probed in field ion emission experiments where the applied field is an adjustable parameter and it is of the same order of magnitude as the surface field. We report here a study of field promoted and surface catalyzed formation of H3 and NH3 on 20 transition metals, using the pulsed-laser imaging atom-probe. We find that in an applied field of about 2.0 V/Å, H3 can be formed most readily on surfaces of hep metals, and metals on the left hand side of the periodic table. Atomic chemisorption of hydrogen favors, but does not guarantee, the formation of H3. In N2H2 mixed gases, a small amount of NH3 can be formed in an applied field of 1.2 to 2.5 V/Å on surfaces of metals which are known to promote such a reaction in field free conditions. However, only on Fe and Co surfaces, a substantial amount of NH3 can be formed. From the dependence of the relative abundances of the various observed ionic species on the composition of the mixed gas and on the gas pressure, we conclude that NH3 is formed from the chemisorbed nitrogen and hydrogen atoms, whereas the pulsed-laser field desorbed NH3+ originates from the field adsorbed NH3, or the physisorbed NH3." @default.
• W2012507314 created "2016-06-24" @default.
• W2012507314 creator A5001049768 @default.
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• W2012507314 date "1984-03-01" @default.
• W2012507314 modified "2023-10-11" @default.
• W2012507314 title "Field promoted and surface catalyzed formation of H3 and NH3 on transition metal surfaces: A pulsed-laser imaging atom-probe study" @default.
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• W2012507314 doi "https://doi.org/10.1016/0039-6028(84)90252-8" @default.
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