STUDIES OF THE ADSORPTION OF CYANOGEN (C2N2) ON Cu(001) USING HELIUM ATOM SCATTERING
I. G. SHUTTLEWORTH
The adsorption of cyanogen (C2N2) on Cu(001) has been investigated using helium atom scattering. Adsorption at 263 K produces a two domain structure with periodicity c(10 Ã 6) and symmetry c2 mm. The principle axes of the two domains in the c(10 Ã 6) pattern lie at right angles to one another. Adsorption at lower temperatures (163 K) produces a disordered structure with no observable diffraction features other than the specular. Annealing the disordered phase to 263 K does not produce an ordered structure. Cooling the ordered structure from 263 K to 163 K produces an enhancement of the diffraction features consistent with the DebyeâWaller effect but no disruption of the c(10 Ã 6) periodicity. Annealing the ordered structure shows that the structure remains stable at temperatures up to 373 K. Analysis of the in-plane diffraction features suggests a reconstruction of the Cu(001) substrate consistent with the 2D FrenkelâKontorova model for overlayer strain relief.
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