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Suppression and enhancement of van der Waals interactions

J. Chem. Phys. 104, 8730 (1996); doi:10.1063/1.471562

Issue Date: 1 June 1996

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Minhaeng Cho and Robert J. Silbey
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
The van der Waals interaction of a pair of anisotropic molecules near planar dielectric surfaces is studied by using the linear response formalism. The spatial correlation function (Green function) of the vacuum electric field in the presence of dielectric surfaces is obtained by using suitable Fresnel mode functions of the quantized electric field. In the short-distance limit, it is observed that the long-range interaction potential is significantly modified by the dielectric surfaces and strongly depends on the geometry of the two molecules near dielectric surfaces. When the two molecules are anisotropic, depending on the molecular alignments with respect to the surfaces, the van der Waals interaction is enhanced or suppressed by the existence of the surfaces. When the two molecules are in between two dielectric surfaces, the overall magnitude of the van der Waals interaction is suppressed in comparison to that in the free space because the vacuum electromagnetic field intensity is reduced by the transmissivities that are generally less than unity. ©1996 American Institute of Physics.
History: Received 18 January 1996; accepted 12 February 1996
Permalink: http://link.aip.org/link/?JCPSA6/104/8730/1
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KEYWORDS and PACS

Keywords
PACS
  • 34.20.Gj
    Atomic and molecular collision processes and interactions Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions Intermolecular and atommolecule potentials and forces
  • 34.50.Dy
    Atomic and molecular collision processes and interactions Scattering of atoms, molecules, and ions Interactions of atoms, molecules, and their ions with surfaces; photon and electron emission; neutralization of ions
  • YEAR: 1996

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ISSN:
0021-9606 (print)   1089-7690 (online)
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