Abstract
The chemisorption of C 2H 4 on aluminum cluster ions, Al itn + ( n=24–26), has been studied using low-energy ion beam techniques. Three different types of Al itnC 2H 4 + adduct (labelled A, B and C) were observed over different collision energy ranges. Formation of adduct A proceeds with no activation barrier, but there are activation energies of 0.5–1.0 and 3.0–3.5 eV for adducts B and C, respectively. It is argued that these three distinct adducts are due to different structures of the C 2H 4 species on the cluster surface. Chemisorption of C 2H 4 in adducts A and B is probably non-dissociative, but adduct C arises from dissociative chemisorption.
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