Interaction between Polymers

  • János J. Ladik


Murell et al.(1) have shown that if one develops a perturbation theory with overlap to be applied if the overlap integral S < 0.1, namely the two interacting molecules are at least 2.8–3.0 Å apart, then one obtains the interaction energy between two molecules A and B as a power-series expansion in the intermolecular potential U and the overlap integral S. Up to the order of U 2 S 2 the interaction energy terms are
$$\Delta {{E}^{\text{PT}}}={{E}_{\text{el st}}}+{{E}_{\text{pol}}}+{{E}_{\text{exch}}}+{{E}_{\text{ch tr}}}+{{E}_{\text{disp}}}+{{E}_{\text{exch pol}}}+{{E}_{\text{exch disp}}}$$
Here the terms E el st, E po1, and E disp are of zeroth order in overlap and have the same form as in zero-overlap perturbation theory. The contribution of order US 2 leads to the exchange energy E exch and the energy contributions of order U 2 S 2 may be subdivided into the charge transfer energy E ch tr and the exchange polarization and exchange dispersion terms due to the exchange. Since the latter two terms are much smaller than the others, one can neglect them in the calculations.


Point Charge Polypeptide Backbone Charge Transfer Energy Helical Parameter Empty Part 
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Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • János J. Ladik
    • 1
  1. 1.University of Erlangen-NurembergErlangen-WaterlooFederal Republic of Germany

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