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- Kestutis Aidas, Celestino Angeli, +81 authors Hans Ågren
- 2014

- David P Tew, Wim Klopper, Miriam Heckert, Jürgen Gauss
- The journal of physical chemistry. A
- 2007

Benchmark, frozen-core CCSD(T) equilibrium harmonic vibrational frequencies of 12 closed-shell and five open-shell molecules are computed to within 1 cm-1 of the basis set limit using the explicitly correlated CCSD(T)-R12 method. The convergence of the standard CCSD(T) method with the one-particle basis sets of Dunning and co-workers is examined and found… (More)

- Christof Hättig, Wim Klopper, Andreas Köhn, David P Tew
- Chemical reviews
- 2012

Explicitly Correlated Electrons in Molecules Christof H€attig, Wim Klopper,* Andreas K€ohn, and David P. Tew Lehrstuhl f€ur Theoretische Chemie, Ruhr-Universit€at Bochum, D-44780 Bochum, Germany Abteilung f€ur Theoretische Chemie, Institut f€ur Physikalische Chemie, Karlsruher Institut f€ur Technologie, KIT-Campus S€ud, Postfach 6980, D-76049 Karlsruhe,… (More)

- David P. Tew, Wim Klopper, Trygve Helgaker
- Journal of Computational Chemistry
- 2007

The physical interactions among electrons and nuclei, responsible for the chemistry of atoms and molecules, is well described by quantum mechanics and chemistry is therefore fully described by the solutions of the Schrödinger equation. In all but the simplest systems we must be content with approximate solutions, the principal difficulty being the treatment… (More)

- Andreas Köhn, David P Tew
- The Journal of chemical physics
- 2010

Geminal functions based on Slater-type correlation factors and fixed expansion coefficients, determined by cusp conditions, have in recent years been forwarded as an efficient and numerically stable method for introducing explicit electron correlation into coupled-cluster theory. In this work, we analyze the equations of explicitly correlated… (More)

- Rafal A. Bachorz, Florian A. Bischoff, +4 authors David P. Tew
- Journal of Computational Chemistry
- 2011

A detailed description of the explicitly correlated second-order Møller-Plesset perturbation theory (MP2-F12) method, as implemented in the TURBOMOLE program package, is presented. The TURBOMOLE implementation makes use of density fitting, which greatly reduces the prefactor for integral evaluation. Methods are available for the treatment of ground states… (More)

- Christof Hättig, David P Tew, Benjamin Helmich
- The Journal of chemical physics
- 2012

We present an algorithm for computing explicitly correlated second- and third-order Møller-Plesset energies near the basis set limit for large molecules with a cost that scales formally as N(4) with system size N. This is achieved through a hybrid approach where locality is exploited first through orbital specific virtuals (OSVs) and subsequently through… (More)

- Gunnar Schmitz, Christof Hättig, David P Tew
- Physical chemistry chemical physics : PCCP
- 2014

We present our current progress on the combination of explicit electron correlation with the pair natural orbital (PNO) representation. In particular we show cubic scaling PNO-MP2-F12, and PNO-CCSD[F12] implementations. The PNOs are constructed using a hybrid scheme, where the PNOs are generated in a truncated doubles space, spanned by orbital specific… (More)

- Yimin Wang, Bastiaan J Braams, Joel M Bowman, Stuart Carter, David P Tew
- The Journal of chemical physics
- 2008

Quantum calculations of the ground vibrational state tunneling splitting of H-atom and D-atom transfer in malonaldehyde are performed on a full-dimensional ab initio potential energy surface (PES). The PES is a fit to 11 147 near basis-set-limit frozen-core CCSD(T) electronic energies. This surface properly describes the invariance of the potential with… (More)

- Daniel Löffler, Noelia Bajales, +7 authors Manfred M Kappes
- The Journal of chemical physics
- 2009

Films comprising predominantly novel isomers of C(60) [=C(60)(nIPR)] have been generated by low energy ion beam deposition of vibronically excited C(60)(+) onto graphite followed by selective sublimation of C(60)(I(h)) from the deposited isomer mixture. The incident ions were generated by electron impact ionization/fragmentation of sublimed C(70). Images of… (More)