dorsal/arxiv
View SchemaFully retarded van der Waals interaction between dielectric nanoclusters
| Authors | Hye-Young Kim, Jorge O. Sofo, Darrell Velegol, Milton W. Cole |
|---|---|
| Categories | |
| ArXiv ID | physics/0603161 |
| URL | https://arxiv.org/abs/physics/0603161 |
| DOI | 10.1063/1.2358681 |
Abstract
The fully retarded dispersion interaction between an atom and a cluster or between two clusters is calculated. Results obtained with two different methods are compared. One is to consider a cluster as a collection of many atoms and evaluate the sum of two-body and three-body interatomic interactions, a common assumption. The other method, valid at large separation, is to consider each cluster as a point particle, characterized by a polarizability tensor, and evaluate the inter-cluster interaction. This method employs the static polarizability, evaluated by including all many-body (MB) intra-cluster atomic interactions self-consistently, which yields the full inter-cluster interaction, including all MB terms. A comparison of the results from the two methods reveals that the contribution of the higher-than-three-body MB interactions is always attractive and non-negligible, with a relative importance that varies with geometry. The procedure is quite general and is applicable to any shape or size of dielectric clusters, in principle. We present numerical results for clusters composed of atoms with polarizability consistent with silica, for which the higher-than-three-body MB correction term can be as high as 42% of the atomic pair-wise sum. The full result is quite sensitive to the anisotropic structure of the cluster, in contrast to the result found in the additive case, which is orientation independent. We also present a power law expansion of the total van der Waals (VDW) interaction as a series of n-body interaction terms.
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"abstract": "The fully retarded dispersion interaction between an atom and a cluster or\nbetween two clusters is calculated. Results obtained with two different methods\nare compared. One is to consider a cluster as a collection of many atoms and\nevaluate the sum of two-body and three-body interatomic interactions, a common\nassumption. The other method, valid at large separation, is to consider each\ncluster as a point particle, characterized by a polarizability tensor, and\nevaluate the inter-cluster interaction. This method employs the static\npolarizability, evaluated by including all many-body (MB) intra-cluster atomic\ninteractions self-consistently, which yields the full inter-cluster\ninteraction, including all MB terms. A comparison of the results from the two\nmethods reveals that the contribution of the higher-than-three-body MB\ninteractions is always attractive and non-negligible, with a relative\nimportance that varies with geometry. The procedure is quite general and is\napplicable to any shape or size of dielectric clusters, in principle. We\npresent numerical results for clusters composed of atoms with polarizability\nconsistent with silica, for which the higher-than-three-body MB correction term\ncan be as high as 42% of the atomic pair-wise sum. The full result is quite\nsensitive to the anisotropic structure of the cluster, in contrast to the\nresult found in the additive case, which is orientation independent. We also\npresent a power law expansion of the total van der Waals (VDW) interaction as a\nseries of n-body interaction terms.",
"arxiv_id": "physics/0603161",
"authors": [
"Hye-Young Kim",
"Jorge O. Sofo",
"Darrell Velegol",
"Milton W. Cole"
],
"categories": [
"physics.atm-clus"
],
"doi": "10.1063/1.2358681",
"title": "Fully retarded van der Waals interaction between dielectric nanoclusters",
"url": "https://arxiv.org/abs/physics/0603161"
},
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