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Structure and reactivity of iron single crystal surfaces.

Booyens, Sharon. 2010. Structure and reactivity of iron single crystal surfaces. PhD Thesis, Cardiff University.

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Abstract

Measurements with a molecular beam reactor show that the initial sticking probability of C<sub>2</sub>H<sub>4</sub> on Fe(111) decreases with temperature from 0.35 at 373 K to 0.13 at 873 K. Steady state sticking commences above 573 K and only steady state sticking is observed above 723 K. Between 373 and 673 K the carbon deposits resulting from C<sub>2</sub>H<sub>4</sub> dosing decrease O<sub>2</sub> sticking compared to the clean surface, since the surface now accommodates both species. Above this temperature O<sub>2 </sub> sticking increase significantly compared to the clean surface as it reacts with surface C to form CO gas. Clean off experiments suggest that surface oxygen provides a driving force for C in the subsurface/bulk to segregate to the surface.

Item Type: Thesis (PhD)
Status: Unpublished
Date of First Compliant Deposit: 30 March 2016
Last Modified: 08 Jan 2014 15:14
URI: http://orca-mwe.cf.ac.uk/id/eprint/54195

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