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New general tools for constrained geometry optimizations
Department of Theoretical Chemistry, Lund University.ORCID iD: 0000-0001-7567-8295
2005 (English)In: Journal of Chemical Theory and Computation, ISSN 1549-9618, E-ISSN 1549-9626, Vol. 1, no 5, 1029-1037 p.Article in journal (Refereed) Published
Abstract [en]

A modification of the constrained geometry optimization method by Anglada and Bofill (Anglada, J. M.; Bofill, J. M. J. Comput. Chem. 1997, 18, 992-1003) is designed and implemented. The changes include the choice of projection, quasi-line-search, and the use of a Rational Function optimization approach rather than a reduced-restricted-quasi-Newton-Raphson method in the optimization step. Furthermore, we show how geometrical constrains can be implemented in an approach based on nonreclunclant curvilinear coordinates avoiding the inclusion of the constraints in the set of redundant coordinates used to define the internal coordinates. The behavior of the new implementation is demonstrated in geometry optimizations featuring single or multiple geometrical constraints (bond lengths, angles, etc.), optimizations on hyperspherical cross sections (as in the computation of steepest descent paths), and location of energy minima on the intersection subspace of two potential energy surfaces (i.e. minimum energy crossing points). In addition, a novel scheme to determine the crossing point geometrically nearest to a given molecular structure is proposed.

Place, publisher, year, edition, pages
2005. Vol. 1, no 5, 1029-1037 p.
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-143897DOI: 10.1021/ct0500949OAI: oai:DiVA.org:uu-143897DiVA: diva2:394359
Available from: 2011-02-02 Created: 2011-01-25 Last updated: 2015-01-08Bibliographically approved

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