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Stereodynamical effects in the adsorption of ethylene molecules onto metal surfaces (Articolo in rivista)

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Stereodynamical effects in the adsorption of ethylene molecules onto metal surfaces (Articolo in rivista) (literal)

Anno

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Alternative label

Vattuone L. a; Gerbi A. a; Rocca M. a; Valbusa U. b; Pirani F. c; Vecchiocattivi F. d; Cappelletti D. d (2004)
Stereodynamical effects in the adsorption of ethylene molecules onto metal surfaces
in Angewandte Chemie International Edition; WILEY-V C H VERLAG GMBH, WEINHEIM (Germania)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Vattuone L. a; Gerbi A. a; Rocca M. a; Valbusa U. b; Pirani F. c; Vecchiocattivi F. d; Cappelletti D. d (literal)

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Note

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a INFM Unità di Genova, Dipartimento di Fisica, IMEM-CNR Sezione di Genova, Via Dodecaneso 33, Genoa, Italy; b INFM Unità di Genova, Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, Genoa, Italy; c INFM Unità di Perugia, Dipartimento di Chimica, Università di Perugia, Perugia, Italy; d Dipto. Ingegneria Civile Ambientale, Università di Perugia, Perugia, Italy (literal)

Titolo

Stereodynamical effects in the adsorption of ethylene molecules onto metal surfaces (literal)

Abstract

The role of molecular alignment of nonpolar molecules in gas-surface interactions has so far escaped direct experimental investigations. We have employed a novel technique to prepare highly aligned supersonic beams and we show that ethylene molecules that impinge on silver surfaces precovered with molecular oxygen as \"helicopters\" have a higher sticking probability than \"cartwheels\" (Figure 1). The sticking probability, S, of reactant gas-phase molecules impinging on a metal surface is a key parameter for the quantitative understanding of heterogeneous catalysis at the gas-solid interface. Herein we report the dependence of S on molecular alignment for ethylene, an apolar molecule, interacting with a metallic surface, specifically O-recovered Ag (001). The observed steric effect is large, thus strongly influencing adsorption. The study of such a prototype system is very important to clarify the dynamics in the entrance channels of the potential energy surfaces controlling the catalytic epoxidation of unsaturated hydrocarbons. (literal)

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