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Title: Excitability in the H{sub 2}+O{sub 2} reaction on a Rh(110) surface induced by high coverages of coadsorbed potassium

By means of photoemission electron microscopy as spatially resolving method, the effect of high coverages of coadsorbed potassium (0.16 ≤ θ{sub K} ≤ 0.21) on the dynamical behavior of the H{sub 2} + O{sub 2} reaction over a Rh(110) surface was investigated. We observe that the originally bistable system is transformed into an excitable system as evidenced by the formation of target patterns and spiral waves. At K coverages close to saturation (θ{sub K} ≈ 0.21) mass transport of potassium with pulses is seen.
Authors:
 [1] ;  [2]
  1. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA-CONICET), Fac. Cs. Exactas, Universidad Nacional de La Plata, 64 y Diag. 113 (1900) La Plata (Argentina)
  2. Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstr. 3-3a, D-30167 Hannover (Germany)
Publication Date:
OSTI Identifier:
22413280
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 141; Journal Issue: 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ELECTRON MICROSCOPY; HYDROGEN; PHOTOEMISSION; POTASSIUM; PULSES; RHODIUM 110; SURFACES