OUTGASSING OF HYDROGEN M. Leisch

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Institute of Solid State Physics Sticking coefficients from TDS H.F. Berger et. al. Surface Sci 251/252(1991)882 A. Winkler et. al. I Rev Phys Chem 11(1992)101 Nearly 10x higher sticking coefficients on Ni! Recombination of H is promoted Professor Manfred <strong>Leisch</strong> Horst Cerjak, 19.12.2005 63rd IUVSTA Workshop Avila September 17, 2010 51
Institute of Solid State Physics •Atom Probe show segregation of Ni accompanied by slight Cr depletion. •The steps and facets provide still a considerable number of active sites which can promote the recombination of hydrogen. •Vacancies give reason for subsurface states which act as traps for H. •This surface and subsurface states may control the outgassing behaviour. •From the look on the surface: In all probability diffusion to the surface may be the limiting process. 0.1 µm Professor Manfred <strong>Leisch</strong> Horst Cerjak, 19.12.2005 63rd IUVSTA Workshop Avila September 17, 2010 52
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OUTGASSING OF HYDROGEN M. Leisch

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