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Ballistic motion and abstraction in dimer dissociation at surfaces: Cl-2 on K

Johan Strömquist (Institutionen för teknisk fysik) ; Lars Hellberg (Institutionen för teknisk fysik) ; Bengt Kasemo (Institutionen för teknisk fysik) ; Bengt I. Lundqvist (Institutionen för teknisk fysik)
Surface Science (0039-6028). Vol. 352 (1996), 435-441, p. 7.
[Artikel, refereegranskad vetenskaplig]

Non-traditional dissociation dynamics at surfaces, with charge transfer and diabatic motion, is studied for the model system of Cl-2 molecules impinging on the metal K. Three-dimensional molecular dynamics on simple but physically reasonable potential-energy surfaces is used to investigate the final fates of the dissociation fragments (Cl, Cl-) of the molecular ion, Cl-2(-), that is formed by electron transfer (harpooning) to Cl-2 from the K surface. The model study demonstrates that both abstraction (emission of neutrals) and ballistic motion can result from dissociative chemisorption. Our qualitative reasoning has strong implications on other chemisorption systems, like O-2 on alkali and other metals and halogens on Si, e.g., a proposed explanation for ballistically moving O atoms on Al.

Nyckelord: alkali metals; aluminum; atom emission; energy dissipation; halogens; ion emission; models of surface chemical reactions; oxygen

Denna post skapades 2009-05-19.
CPL Pubid: 94268


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