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Linear-scaling impl...
Linear-scaling implementation of molecular response theory in self-consistent field electronic-structure theory
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Coriani, Sonia (författare)
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Host, Stinne (författare)
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Jansik, Branislav (författare)
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Thogersen, Lea (författare)
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Olsen, Jeppe (författare)
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Jorgensen, Poul (författare)
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Reine, Simen (författare)
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Pawlowski, Filip (författare)
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Helgaker, Trygve (författare)
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- Salek, Pawel (författare)
- KTH,Teoretisk kemi
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(creator_code:org_t)
- AIP Publishing, 2007
- 2007
- Engelska.
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 126:15, s. 11930-11935
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A linear-scaling implementation of Hartree-Fock and Kohn-Sham self-consistent field theories for the calculation of frequency-dependent molecular response properties and excitation energies is presented, based on a nonredundant exponential parametrization of the one-electron density matrix in the atomic-orbital basis, avoiding the use of canonical orbitals. The response equations are solved iteratively, by an atomic-orbital subspace method equivalent to that of molecular-orbital theory. Important features of the subspace method are the use of paired trial vectors (to preserve the algebraic structure of the response equations), a nondiagonal preconditioner (for rapid convergence), and the generation of good initial guesses (for robust solution). As a result, the performance of the iterative method is the same as in canonical molecular-orbital theory, with five to ten iterations needed for convergence. As in traditional direct Hartree-Fock and Kohn-Sham theories, the calculations are dominated by the construction of the effective Fock/Kohn-Sham matrix, once in each iteration. Linear complexity is achieved by using sparse-matrix algebra, as illustrated in calculations of excitation energies and frequency-dependent polarizabilities of polyalanine peptides containing up to 1400 atoms.
Nyckelord
- density-matrix
- hartree-fock
- direct optimization
- equations
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- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Coriani, Sonia
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Host, Stinne
-
Jansik, Branisla ...
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Thogersen, Lea
-
Olsen, Jeppe
-
Jorgensen, Poul
-
visa fler...
-
Reine, Simen
-
Pawlowski, Filip
-
Helgaker, Trygve
-
Salek, Pawel
-
visa färre...
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Journal of Chemi ...
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Kungliga Tekniska Högskolan