STUDIES OF THE ADSORPTION OF ACETONITRILE (CH3CN) ON Cu(001) USING HELIUM ATOM SCATTERING
I. G. SHUTTLEWORTH
The adsorption of acetonitrile (CH3CN) on Cu(001) has been studied using elastic Helium atom scattering (HAS) and has been analyzed using a novel method of direct HAS diffraction image inversion. At low temperatures (138 K) acetonitrile permanently adsorbs forming a c(4 Ã 2) structure at saturation. Annealing the saturated surface to temperatures above 200 K causes the desorption of all surface moieties leaving clean Cu(001). At the adsorption temperatures in the range 153â163 K acetonitrile does not adsorb permanently and demonstrates adsorptionâdesorption equilibrium. These dynamical studies suggest that the acetonitrile molecule does not dissociate during adsorption. Analyses of the c(4 Ã 2) HAS diffraction image have revealed several possible surface structures where the CâCâN axis of the adsorbed molecule lies approximately parallel to the Cu(001) surface.
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