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Dissociative chemisorption of nitrogen on Ru(0001)

J. Chem. Phys. 99, 9248 (1993); doi:10.1063/1.465541

Issue Date: 1 December 1993

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H. Shi, K. Jacobi, and G. Ertl
Fritz Haber Institut der Max Planck Gesellschaft, Faradayweg 4-6, D 14195 Berlin (Dahlem), Germany
The dissociative chemisorption of nitrogen on clean and cesiated Ru(0001) surfaces has been studied using high-resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). N2 (at 300 K) chemisorbs dissociatively with a sticking coefficient of 2×10−6, independent of substrate temperature which was varied between 420 and 700 K. The saturation coverage is found at 0.5 monolayer. The energy of the N–Ru stretching vibration is 71 meV at the bare surface and 69 meV at the cesiated Ru(0001) surface. The activation energy for desorption is about 190 kJ/mol for small coverages. The kinetic data suggest the existence of an activation barrier in the entrance channel of adsorption. Preadsorption of 0.08 monolayer of Cs increases the sticking coefficient only by a factor of 1.3, and the maximum amount of adsorbed N is reduced due to blocking of adsorption sites through Cs. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 9 July 1993; accepted 20 August 1993
Permalink: http://link.aip.org/link/?JCPSA6/99/9248/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.65.My
    Physical chemistry Surface and interface chemistry Chemisorption
  • 82.80.Pv
    Physical chemistry Chemical analysis and related physical methods of analysis Electron spectroscopy for chemical analysis (photoelectron, Auger spectroscopy, etc.)
  • 82.80.Yc
    Physical chemistry Chemical analysis and related physical methods of analysis Other methods of chemical analysis
  • YEAR: 1993

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ISSN:
0021-9606 (print)   1089-7690 (online)
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