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Electric multipole moment fluctuations in polar liquids.
MedLine Citation:
PMID:  19334865     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
A general expression for the distribution of the fluctuating 2(l)-pole moment M(l) of a spherical sample of dielectric material is derived on the basis of dielectric theory combined with statistical mechanics. The formulas are compared with results from computer simulations of a weakly coupled Stockmayer fluid and the agreement is shown to be excellent. Furthermore, we calculate the size of the coupling, quantified through the free energy of solvation A(solv), of the fluctuating electric moments to a surrounding dielectric medium. It turns out that the contribution to A(solv) from each fluctuating electric moment actually increases with increasing order l of the moment, resulting in a formally infinite free energy of solvation. We also present a correction to A(solv) for molecular media, which shows that the molecular nature of the surrounding medium effectively suppresses the divergence in the solvation free energy.
Authors:
Joakim Stenhammar; Per Linse; Per-Ake Malmqvist; Gunnar Karlström
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of chemical physics     Volume:  130     ISSN:  1089-7690     ISO Abbreviation:  J Chem Phys     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-04-01     Completed Date:  2009-08-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375360     Medline TA:  J Chem Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  124521     Citation Subset:  -    
Affiliation:
Division of Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-22100 Lund, Sweden. joakim.stenhammar@fkem1.lu.se
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