Quantum–mechanical methods that are both computationally fast and accurate are not yet available for electronic excitations having charge transfer character. In this work, we present a significant step forward towards this goal for those charge transfer excitations that take place between non-covalently bound molecules. In particular, we present a method that scales linearly with the number of non-covalently bound molecules in the system and is based on a two-pronged approach: The molecular electronic structure of broken-symmetry charge-localized states is obtained with the frozen density embedding formulation of subsystem density-functional theory; subsequently, in a post-SCF calculation, the full-electron Hamiltonian and overlap matrix elements among the charge-localized states are evaluated with an algorithm which takes full advantage of the subsystem DFT density partitioning technique. The method is benchmarked against coupled-cluster calculations and achieves chemical accuracy for the systems considered for intermolecular separations ranging from hydrogen-bond distances to tens of Ångstroms. Numerical examples are provided for molecular clusters comprised of up to 56 non-covalently bound molecules.
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7 February 2013
Research Article|
February 01 2013
An accurate and linear-scaling method for calculating charge-transfer excitation energies and diabatic couplings
Michele Pavanello;
Michele Pavanello
a)
1Department of Chemistry,
Rutgers University
, Newark, New Jersey 07102-1811, USA
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Troy Van Voorhis;
Troy Van Voorhis
2Department of Chemistry,
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139-4307, USA
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Lucas Visscher;
Lucas Visscher
3Amsterdam Center for Multiscale Modeling,
VU University
, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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Johannes Neugebauer
Johannes Neugebauer
b)
4Theoretische Organische Chemie,
Organisch-Chemisches Institut der Westfälischen Wilhelms-Universität Münster
, Corrensstraße 40, 48149 Münster, Germany
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a)
E-mail: m.pavanello@rutgers.edu.
b)
E-mail: j.neugebauer@uni-muenster.de.
J. Chem. Phys. 138, 054101 (2013)
Article history
Received:
November 07 2012
Accepted:
January 11 2013
Citation
Michele Pavanello, Troy Van Voorhis, Lucas Visscher, Johannes Neugebauer; An accurate and linear-scaling method for calculating charge-transfer excitation energies and diabatic couplings. J. Chem. Phys. 7 February 2013; 138 (5): 054101. https://doi.org/10.1063/1.4789418
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