Ballistic motion and abstraction in dimer dissociation at surfaces: Cl-2 on K
Journal article, 1996

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.

energy dissipation


atom emission


alkali metals


ion emission

models of surface chemical reactions


Johan Strömquist

Chalmers, Applied Physics

Lars Hellberg

Chalmers, Applied Physics

Bengt Herbert Kasemo

Chalmers, Applied Physics

Bengt Lundqvist

Chalmers, Applied Physics

Surface Science

0039-6028 (ISSN)

Vol. 352 435-441 7-

Subject Categories

Condensed Matter Physics

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