Halogen adsorption on Fe(100): I. The adsorption of Cl2 studied by AES,LEED, work function change and thermal desorption |
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Authors: | P.A. Dowben R.G. Jones |
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Affiliation: | Physics and Chemistry of Solids, Cavendish Laboratory, Madingley Road, Cambridge, CB3 OHE, UK |
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Abstract: | The initial sticking probability of chlorine on Fe(100) at room temperature is calculated to be 0.13, and there is evidence to suggest that the chlorine adsorbs into a short lived mobile precursor state above the surface. The work function change, Δφ, is proportional to coverage and reaches a maximum value of 1.43 eV at saturation. At this coverage a c(2 × 4) LEED pattern is formed. On heating, chlorine is lost from the surface, but the mechanism is such that no detectable loss is incurred at a constant elevated temperature. The c(2 × 4) pattern is shown to be a coincidence structure formed from a net of chlorine atoms on the Fe(100) substrate. This structure is a special case of the more general structure formed at lower concentrations of chlorine. The c(2 × 4) is formed when α = 56.31°, which gives the chlorine atoms a hard sphere diameter of 0.345 nm and a concentration of 0.75 atoms per four-fold site. |
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Keywords: | Address correspondence to this author at: Department of Physics University of Warwick Coventry Warwickshire CV4 7AL England. |
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