title: Excitability in the H₂+O₂ reaction on a Rh(110) surface induced by high coverages of coadsorbed potassium.
abstract: By means of photoemission electron microscopy as spatially resolving method, the effect of high coverages of coadsorbed potassium (0.16 ≤ θ(K) ≤ 0.21) on the dynamical behavior of the H2 + O2 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(K) ≈ 0.21) mass transport of potassium with pulses is seen.
authors.affiliation: 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.
authors.forename: Matías
authors.initials: M
authors.lastname: Rafti
authors.affiliation: Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstr. 3-3a, D-30167 Hannover, Germany.
authors.forename: Ronald
authors.initials: R
authors.lastname: Imbihl