Clustering of Chemisorbed H(D) Atoms on the Graphite (0001) Surface due to Preferential Sticking

Details Clustering of Chemisorbed H(D) Atoms on the Graphite (0001) Surface due to Preferential Sticking Clustering of Chemisorbed H(D) Atoms on the Graphite (0001) Surface due to Preferential Sticking

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvl..97r6102h&link_type=abstract

Physical Review Letters, vol. 97, Issue 18, id. 186102

Physics

70

Chemisorption/Physisorption: Adsorbates On Surfaces, Scanning Tunneling Microscopy, Surface And Interface Chemistry, Heterogeneous Catalysis At Surfaces, Atomic, Molecular, And Chemical, And Grain Processes

Scientific paper

We present scanning tunneling microscopy experiments and density functional theory calculations which reveal a unique mechanism for the formation of hydrogen adsorbate clusters on graphite surfaces. Our results show that diffusion of hydrogen atoms is largely inactive and that clustering is a consequence of preferential sticking into specific adsorbate structures. These surprising findings are caused by reduced or even vanishing adsorption barriers for hydrogen in the vicinity of already adsorbed H atoms on the surface and point to a possible novel route to interstellar H2 formation.

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