Many-body interactions among adsorbed atoms and molecules within carbon nanotubes and in free space

Details Many-body interactions among adsorbed atoms and molecules within carbon nanotubes and in free space Many-body interactions among adsorbed atoms and molecules within carbon nanotubes and in free space

2000-07-03

arxiv.org/abs/cond-mat/0007034v1

Physics

Condensed Matter

Materials Science

11 pages, 5 figures

Scientific paper

10.1016/S0009-2614(00)01245-8

This paper assesses the importance of three-body triple dipole interactions for quasi-one dimensional phases of He, Ne, H_2, Ar, Kr and Xe confined within interstitial channels or on the external surfaces of nanotube bundles. We find the substrate-mediated contribution to be substantial: for interstitial H_2 the well depth of the effective pair potential is reduced to approximately one half of its value in free space. We carry out ab initio calculations on linear and equilateral configurations of H_2 trimer and find that overlap interactions do not greatly change the DDD interaction in the linear configuration when the spacing is greater than about 3 A. However, the DDD interaction alone is clearly insufficient for the triangular configurations studied.

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