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Title: Structure and reactivity of iron single crystal surfaces
Author: Booyens, Sharon
ISNI:       0000 0004 2750 0769
Awarding Body: Cardiff University
Current Institution: Cardiff University
Date of Award: 2010
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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.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available