Electron-induced surface chemistry: Production and characterization of NH2 and NH species on Pt(111)
- 1 May 1996
- journal article
- Published by American Vacuum Society in Journal of Vacuum Science & Technology A
- Vol. 14 (3) , 1516-1521
- https://doi.org/10.1116/1.580288
Abstract
Irradiating molecularly adsorbed NH3 with controlled fluences of 50 eV electrons on Pt(111) at 100 K leads to NH2, NH, and H species. Temperature programmed desorption shows dihydrogen desorption, confirming electron induced decomposition of ammonia, and a new NH3 desorption peak (210 K) attributed to hydrogenation of NH2. High resolution electron energy loss spectroscopy identifies NH2 through two vibrational features at 830 and 1392 cm−1 that are assigned to rocking and wagging modes, and NH through a single strong stretching feature at 3280 cm−1. NH was stable up to 400 K where it dehydrogenated, leaving N on the surface, which was stable up to 700 K. In x‐ray photoelectron spectroscopy a N(1s) peak, shifted to lower binding energy, appears after electron irradiation.Keywords
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