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On the performance of molecular polarization methods close to a point charge

Masia, Marco and Probst, Michael and Rey, Rossend (2005) On the performance of molecular polarization methods close to a point charge. Computer Physics Communications, Vol. 169 (1-3), p. 331-334. ISSN 0010-4655. Article.

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DOI: 10.1016/j.cpc.2005.03.074

Abstract

The induced dipole moment of a water molecule close to a point charge (with the radius of Na+ or Be2+) is computed with the three main methods to implement molecular polarization (point dipoles, fluctuating charges and shell model). The results are compared with high level ab initio calculations and studied as a function of the charge-molecule distance for selected molecular orientations. For the single charge case rather good estimations of the ab initio induced dipole are obtained, with no significant divergences appearing at the shortest distances. Nevertheless, these (linear polarization) methods fail as the charge increases, suggesting that nonlinear effects may not be neglected. Regarding the capabilities of each method, the point dipole method is the one that performs better overall, with the shell model achieving acceptable results in most instances. The fluctuating charge method has some noticeable limitations for implementations with a similar number of interaction sites.

Item Type:Article
ID Code:3616
Status:Published
Refereed:Yes
Uncontrolled Keywords:Polarization, fluctuating charges, point dipoles, shell model, water, ion, sodium, beryllium
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:North Holland
ISSN:0010-4655
Copyright Holders:© 2005 Elsevier
Additional Information:Paper presented at the Europhysics Conference on Computational Physics 2004, Genova, Italy, 14 September 2004.
Deposited On:22 Mar 2010 16:12

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