We employed an explicit expression for the dispersion (D) energy in conjunction with Kohn-Sham (KS) density functional theory and frozen-density embedding (FDE) to calculate interaction energies between DNA base pairs and a selected set of amino acid pairs in the hydrophobic core of a small protein Rubredoxin. We use this data to assess the accuracy of an FDE-D approach for the calculation of intermolecular interactions. To better analyze the calculated interaction energies we furthermore propose a new energy decomposition scheme that is similar to the well-known KS bond formation analysis [F. M. Bickelhaupt and E. J. Baerends, Rev. Comput. Chem. 15, 1 (2000) https://doi.org/10.1002/9780470125922.ch1], but differs in the electron densities used to define the bond energy. The individual subsystem electron densities of the FDE approach sum to the total electron density which makes it possible to define bond energies in terms of promotion energies and an explicit interaction energy. We show that for the systems considered only a few freeze-and-thaw cycles suffice to reach convergence in these individual bond energy components, illustrating the potential of FDE-D as an efficient method to calculate intermolecular interactions.
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7 March 2013
Research Article|
March 07 2013
Bond energy decomposition analysis for subsystem density functional theory
S. Maya Beyhan;
S. Maya Beyhan
Amsterdam Center for Multiscale Modeling,
VU University Amsterdam
, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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Andreas W. Götz;
Andreas W. Götz
a)
Amsterdam Center for Multiscale Modeling,
VU University Amsterdam
, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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Lucas Visscher
Lucas Visscher
b)
Amsterdam Center for Multiscale Modeling,
VU University Amsterdam
, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
Search for other works by this author on:
S. Maya Beyhan
Andreas W. Götz
a)
Lucas Visscher
b)
Amsterdam Center for Multiscale Modeling,
VU University Amsterdam
, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
a)
Also at San Diego Supercomputer Center, University of California San Diego, 9500 Gilman Drive MC0505, La Jolla, California 92093, USA.
b)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
J. Chem. Phys. 138, 094113 (2013)
Article history
Received:
October 25 2012
Accepted:
February 14 2013
Citation
S. Maya Beyhan, Andreas W. Götz, Lucas Visscher; Bond energy decomposition analysis for subsystem density functional theory. J. Chem. Phys. 7 March 2013; 138 (9): 094113. https://doi.org/10.1063/1.4793629
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