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We report an implementation for the computation of optical rotations within the Amsterdam Density Functional program package. The code is based on time-dependent density functional response theory. Optical rotations have been calculated for a test set of 36 organic molecules with various density functionals, and employing basis sets of different quality.… (More)

- Tom Jaksic, M Molly McMahon, Tom Ziegler, Jeffrey I Mechanick
- JPEN. Journal of parenteral and enteral nutrition
- 2010

Nutrition research and education are the domains of many societies with somewhat divergent but often largely overlapping interests. Given the lack of consensus regarding appropriate nutrition therapy and the cacophony of educational efforts, cooperative endeavors seem prudent. The development of research consortia, data registries, tissue repositories, and… (More)

- Mariusz P Mitoraj, Artur Michalak, Tom Ziegler
- Journal of chemical theory and computation
- 2009

UNLABELLED
In the present study we have introduced a new scheme for chemical bond analysis by combining the Extended Transition State (ETS) method [ Theor. Chim. Acta 1977, 46, 1 ] with the Natural Orbitals for Chemical Valence (NOCV) theory [ J. Phys. Chem. A 2008, 112, 1933 ; J. Mol.
MODEL
2007, 13, 347 ]. The ETS-NOCV charge and energy decomposition… (More)

- Artur Michalak, Roger L DeKock, Tom Ziegler
- The journal of physical chemistry. A
- 2008

In the present study the applicability of the bond multiplicities from the Nalewajski and Mrozek valence indices was demonstrated for a variety of transition metal-based systems. The Nalewajski-Mrozek valence indices and bond multiplicity indices have been implemented in the Amsterdam Density Functional program. Selected examples comprise the carbonyl… (More)

- Artur Michalak, Mariusz Mitoraj, Tom Ziegler
- The journal of physical chemistry. A
- 2008

Two sets of orbitals are derived, directly connected to the Nalewajski-Mrozek valence and bond-multiplicity indices: Localized Orbitals from the Bond-Multiplicity Operator (LOBO) and the Natural Orbitals for Chemical Valence (NOCV). LOBO are defined as the eigenvectors of the bond-multiplicity operator. The expectation value of this operator is the… (More)

- Michael Seth, Tom Ziegler, Marc Steinmetz, Stefan Grimme
- Journal of chemical theory and computation
- 2013

The performance of range-separated functionals for the calculation of reaction profiles of organometallic compounds is considered. Sets of high-level computational results are used as reference data for the most part. The benchmark data include a number of reactions involving small molecules reacting with the Pd atom, PdCl(-), PdCl2, and a Ni atom, the… (More)

We report the implementation of the computation of rotatory strengths, based on time-dependent density functional theory, within the Amsterdam Density Functional program. The code is applied to the simulation of circular dichroism spectra of small and moderately sized organic molecules, such as oxiranes, aziridines, cyclohexanone derivatives, and helicenes.… (More)

- Tom Ziegler, Mykhaylo Krykunov
- The Journal of chemical physics
- 2010

It is well known that time-dependent density functional theory (TD-DFT) based on standard gradient corrected functionals affords both a quantitative and qualitative incorrect picture of charge transfer transitions between two spatially separated regions. It is shown here that the well known failure can be traced back to the use of linear response theory.… (More)

- Michael Seth, Tom Ziegler, Arup Banerjee, Jochen Autschbach, Stan J A Van Gisbergen, Evert J Baerends
- The Journal of chemical physics
- 2004

A procedure for calculating the A term and the A/D ratio of magnetic circular dichroism (MCD) within time-dependent density functional theory (TD-DFT) is described. Utilizing an implementation of the MCD theory within the Amsterdam Density Functional program, the A term contributions to the MCD spectra of MnO(4) (-), CrO(4) (2-), VO(4) (3-), MoO(4) (2-),… (More)

- Michael Seth, Tom Ziegler, Jochen Autschbach
- The Journal of chemical physics
- 2005

A procedure for calculating the magnetic circular dichroism C/D ratio from density functional theory calculations is discussed. The method is simplified considerably through the application of group theory and the irreducible-tensor method and only requires integrals of the magnetic dipole moment operator over a few orbitals and published tables of symmetry… (More)