We assess a variant of linear-response range-separated time-dependent density-functional theory (TDDFT), combining a long-range Hartree-Fock (HF) exchange kernel with a short-range adiabatic exchange-correlation kernel in the local-density approximation (LDA) for calculating isotropic C6 dispersion coefficients of homodimers of a number of closed-shell atoms and small molecules. This range-separated TDDFT tends to give underestimated C6 coefficients of small molecules with a mean absolute percentage error of about 5%, a slight improvement over standard TDDFT in the adiabatic LDA which tends to overestimate them with a mean absolute percentage error of 8%, but close to time-dependent Hartree-Fock which has a mean absolute percentage error of about 6%. These results thus show that introduction of long-range HF exchange in TDDFT has a small but beneficial impact on the values of C6 coefficients. It also confirms that the present variant of range-separated TDDFT is a reasonably accurate method even using only a LDA-type density functional and without adding an explicit treatment of long-range correlation.
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21 May 2013
Research Article|
May 21 2013
Assessment of range-separated time-dependent density-functional theory for calculating C6 dispersion coefficients
Julien Toulouse;
Julien Toulouse
a)
1Laboratoire de Chimie Théorique,
Université Pierre et Marie Curie and CNRS
, 75252 Paris, France
2Laboratoire de Chimie et Physique Quantiques, IRSAMC,
Université de Toulouse and CNRS
, 31062 Toulouse, France
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Elisa Rebolini;
Elisa Rebolini
1Laboratoire de Chimie Théorique,
Université Pierre et Marie Curie and CNRS
, 75252 Paris, France
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Tim Gould;
Tim Gould
3Queensland Micro and Nano Technology Centre,
Griffith University
, Nathan, QLD 4111, Australia
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John F. Dobson;
John F. Dobson
3Queensland Micro and Nano Technology Centre,
Griffith University
, Nathan, QLD 4111, Australia
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Prasenjit Seal;
Prasenjit Seal
b)
4CRM2, Institut Jean Barriol,
Université de Lorraine and CNRS
, 54506 Vandoeuvre-lès-Nancy, France
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János G. Ángyán
János G. Ángyán
c)
4CRM2, Institut Jean Barriol,
Université de Lorraine and CNRS
, 54506 Vandoeuvre-lès-Nancy, France
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Julien Toulouse
1,2,a)
Elisa Rebolini
1
Tim Gould
3
John F. Dobson
3
Prasenjit Seal
4,b)
János G. Ángyán
4,c)
1Laboratoire de Chimie Théorique,
Université Pierre et Marie Curie and CNRS
, 75252 Paris, France
2Laboratoire de Chimie et Physique Quantiques, IRSAMC,
Université de Toulouse and CNRS
, 31062 Toulouse, France
3Queensland Micro and Nano Technology Centre,
Griffith University
, Nathan, QLD 4111, Australia
4CRM2, Institut Jean Barriol,
Université de Lorraine and CNRS
, 54506 Vandoeuvre-lès-Nancy, France
a)
Electronic mail: [email protected]
b)
Present address: Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA.
c)
Electronic mail: [email protected]
J. Chem. Phys. 138, 194106 (2013)
Article history
Received:
March 30 2013
Accepted:
April 30 2013
Citation
Julien Toulouse, Elisa Rebolini, Tim Gould, John F. Dobson, Prasenjit Seal, János G. Ángyán; Assessment of range-separated time-dependent density-functional theory for calculating C6 dispersion coefficients. J. Chem. Phys. 21 May 2013; 138 (19): 194106. https://doi.org/10.1063/1.4804981
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