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 C₂H₄ 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 C₂H₄ dosing decrease O₂ sticking compared to the clean surface, since the surface now accommodates both species. Above this temperature O₂ 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Status:	Unpublished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:	https://orca.cardiff.ac.uk/id/eprint/54195

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