Radical interactions at surfaces

DIPC Seminars

Prof. Aart W. Kleyn, Director HIMS, Faculty of Science, University of Amsterdam
Donostia International Physics Center (DIPC).Paseo Manuel de Lardizabal, 4 (nearby the Facultad de Quimica), Donostia
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Radical interactions at surfaces Aart W. Kleyn FOM Institute for Plasma Physics RIJNHUIZEN, 3430 BE Nieuwegein, The Netherlands Van 't Hoff Institute for Molecular Sciences, Faculty of Science, University of Amsterdam adjunct Professor at Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories For this presentation ‘radical’ will be used in two different meanings of the word. In the fusion reactor ITER the interaction between the plasma and the surfaces is radical indeed. Power densities of 10 MW/m2 lead to such radical interactions. The important issues here are: does the surface survive the enourmous power load, introduced by hydrogen atoms, does the wall capture a significant fraction of the plasma flux, and does the hydrogen retention show a dependence on neutron irradiation damage. In the talk this topic will be briefly introduced and examples of the interaction between hydrogen van graphite and hydrogen and irradiated tungsten will be given. Both theoretical and experimental studies will be briefly adressed. In the second sense of the word ‘radical’ the interaction between reactive N-atoms and surfaces will be discussed. Here the characteristics of the interaction and the effect on the reactivity of the Ag and Ru surfaces will be addressed.