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  4. Van Der Waals Interaction Between a Molecule and a Solid Surface
 
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Van Der Waals Interaction Between a Molecule and a Solid Surface

Resource
CHINESE JOURNAL OF PHYSICS, VOL. 31, NO. 1
Journal
CHINESE JOURNAL OF PHYSICS
Journal Volume
VOL. 31
Journal Issue
NO. 1
Pages
-
Date Issued
1993-02
Date
1993-02
Author(s)
Cheng, Yi-Chen
Huang, Hsin-Yi
DOI
20060927120008117889
URI
http://ntur.lib.ntu.edu.tw//handle/246246/20060927120008117889
Abstract
A general expression for the Van der Waals interaction energy between a molecule and a solid surface is derived, which depends on the orientation of the molecule with respect to the surface, and which is valid for all molecule-surface separation z, provided that the retardation effect can be neglected. Two special cases are discussed: (1) molecules with axial symmetry, and (2) molecules with a permanent electric dipole moment. In all cases the leading term of the asymptotic expansion of the energy is the zw3 term, same as the atom-surface interaction case. The Van der Waals energy favors the head on position of molecular adsorption on a solid surface with either the axis of symmetry or the direction of the permanent dipole moment perpendicular to the surface. The water molecule Hz0 is taken as an example to calculate the permanent dipole moment contribution to the Van der Waals energy, which shows that it has about the same order of magnitude of the contribution from the induced dipole moment for t to be around a few Angstroms.
Publisher
臺北市:國立臺灣大學物理系所
Type
journal article
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