Ballistic motion and abstraction in dimer dissociation at surfaces: Cl-2 on K
Artikel i vetenskaplig tidskrift, 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

oxygen

atom emission

aluminum

alkali metals

halogens

ion emission

models of surface chemical reactions

Författare

Johan Strömquist

Chalmers, Teknisk fysik

Lars Hellberg

Chalmers, Teknisk fysik

Bengt Herbert Kasemo

Chalmers, Teknisk fysik

Bengt Lundqvist

Chalmers, Teknisk fysik

Surface Science

0039-6028 (ISSN)

Vol. 352 435-441 7-

Ämneskategorier

Den kondenserade materiens fysik