Ym. Sun et al., ELECTRON-INDUCED SURFACE-CHEMISTRY - PRODUCTION AND CHARACTERIZATION OF NH2 AND NH SPECIES ON PT(111), Journal of vacuum science & technology. A. Vacuum, surfaces, and films, 14(3), 1996, pp. 1516-1521
Citations number
23
Categorie Soggetti
Physics, Applied","Materials Science, Coatings & Films
Irradiating molecularly adsorbed NH, with controlled fluences of 50 eV
electrons on Pt(111) at 100 K leads to NH2, NH, and H species. Temper
ature programmed desorption shows dihydrogen desorption, confirming el
ectron 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 featur
es at 830 and 1392 cm(-1) that are assigned to rocking and wagging mod
es, 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 su
rface, which was stable up to 700 K. In x-ray photoelectron spectrosco
py a N(1s) peak, shifted to lower binding energy, appears after electr
on irradiation. (C) 1996 American Vacuum Society.