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Capturing the electron–electron cusp with the coupling-constant averaged exchange–correlation hole: A case study for Hooke’s atoms (2024)
Journal Article
Hou, L., Irons, T. J. P., Wang, Y., Furness, J. W., Wibowo-Teale, A. M., & Sun, J. (2024). Capturing the electron–electron cusp with the coupling-constant averaged exchange–correlation hole: A case study for Hooke’s atoms. Journal of Chemical Physics, 160(1), Article 014103. https://doi.org/10.1063/5.0173370

In density-functional theory, the exchange–correlation (XC) energy can be defined exactly through the coupling-constant (λ) averaged XC hole n¯xc(r, r′), representing the probability depletion of finding an electron at r′ due to an electron at r. Acc... Read More about Capturing the electron–electron cusp with the coupling-constant averaged exchange–correlation hole: A case study for Hooke’s atoms.

QSym2: A Quantum Symbolic Symmetry Analysis Program for Electronic Structure (2023)
Journal Article
Huynh, B. C., Wibowo-Teale, M., & Wibowo-Teale, A. M. (2024). QSym2: A Quantum Symbolic Symmetry Analysis Program for Electronic Structure. Journal of Chemical Theory and Computation, 20(1), 114–133. https://doi.org/10.1021/acs.jctc.3c01118

Symmetry provides a powerful machinery to classify, interpret, and understand quantum-mechanical theories and results. However, most contemporary quantum chemistry packages lack the ability to handle degeneracy and symmetry breaking effects, especial... Read More about QSym2: A Quantum Symbolic Symmetry Analysis Program for Electronic Structure.

QSym²: A Quantum Symbolic Symmetry Analysis Program for Electronic Structure (2023)
Journal Article
Huynh, B., Wibowo-Teale, M., & Wibowo-Teale, A. (2024). QSym²: A Quantum Symbolic Symmetry Analysis Program for Electronic Structure. Journal of Chemical Theory and Computation, 20(1), 114-133. https://doi.org/10.1021/acs.jctc.3c01118

Symmetry provides a powerful machinery to classify, interpret, and understand quantum-mechanical theories and results. However, most contemporary quantum chemistry packages lack the ability to handle degeneracy and symmetry breaking effects, especial... Read More about QSym²: A Quantum Symbolic Symmetry Analysis Program for Electronic Structure.

Real-time time-dependent self-consistent field methods with dynamic magnetic fields (2023)
Journal Article
Wibowo-Teale, M., Ennifer, B. J., & Wibowo-Teale, A. M. (2023). Real-time time-dependent self-consistent field methods with dynamic magnetic fields. Journal of Chemical Physics, 159(10), Article 104102. https://doi.org/10.1063/5.0160317

The first finite basis set implementation of the real-time time-dependent self-consistent field method in a dynamic (time-dependent) magnetic field using London atomic orbitals (LAOs) is presented. The accuracy of the finite basis approach using LAOs... Read More about Real-time time-dependent self-consistent field methods with dynamic magnetic fields.

Semiempirical Methods for Molecular Systems in Strong Magnetic Fields (2023)
Journal Article
Cheng, C. Y., & Wibowo-Teale, A. M. (2023). Semiempirical Methods for Molecular Systems in Strong Magnetic Fields. Journal of Chemical Theory and Computation, 19(18), 6226-6241. https://doi.org/10.1021/acs.jctc.3c00671

A general scheme is presented to extend semiempirical methods to include the effects of arbitrary strength magnetic fields, while maintaining computational efficiency. The approach utilizes three main modifications; a London atomic orbital (LAO) basi... Read More about Semiempirical Methods for Molecular Systems in Strong Magnetic Fields.

Understanding ground and excited-state molecular structure in strong magnetic fields using the maximum overlap method (2022)
Journal Article
Wibowo, M., Huynh, B. C., Cheng, C. Y., Irons, T. J. P., & Teale, A. M. (2022). Understanding ground and excited-state molecular structure in strong magnetic fields using the maximum overlap method. Molecular Physics, Article e2152748. https://doi.org/10.1080/00268976.2022.2152748

The maximum overlap method (MOM) provides a simple but powerful approach for performing calculations on excited states by targeting solutions with non-Aufbau occupations from a reference set of molecular orbitals. In this work, the MOM is used to acc... Read More about Understanding ground and excited-state molecular structure in strong magnetic fields using the maximum overlap method.

Molecular charge distributions in strong magnetic fields: a conceptual and current DFT study (2022)
Journal Article
Irons, T. J. P., Huynh, B. C., Teale, A. M., De Proft, F., & Geerlings, P. (2022). Molecular charge distributions in strong magnetic fields: a conceptual and current DFT study. Molecular Physics, https://doi.org/10.1080/00268976.2022.2145245

The effect of strong magnetic fields on the charge distribution of the hydrogen halides, H2O and NH3 is studied in the context of recent extensions of conceptual density functional theory to include additional variables such as external magnetic fiel... Read More about Molecular charge distributions in strong magnetic fields: a conceptual and current DFT study.

An Embedded Fragment Method for Molecules in Strong Magnetic Fields (2022)
Journal Article
Speake, B. T., Irons, T. J. P., Wibowo, M., Johnson, A. G., David, G., & Teale, A. M. (2022). An Embedded Fragment Method for Molecules in Strong Magnetic Fields. Journal of Chemical Theory and Computation, 18(12), 7412-7427. https://doi.org/10.1021/acs.jctc.2c00865

An extension of the embedded fragment method for calculations on molecular clusters is presented, which includes strong external magnetic fields. The approach is flexible, allowing for calculations at the Hartree-Fock, current-density-functional theo... Read More about An Embedded Fragment Method for Molecules in Strong Magnetic Fields.

Exact constraints and appropriate norms in machine-learned exchange-correlation functionals (2022)
Journal Article
Pokharel, K., Furness, J. W., Yao, Y., Blum, V., Irons, T. J. P., Teale, A. M., & Sun, J. (2022). Exact constraints and appropriate norms in machine-learned exchange-correlation functionals. Journal of Chemical Physics, 157(17), Article 174106. https://doi.org/10.1063/5.0111183

Machine learning techniques have received growing attention as an alternative strategy for developing general-purpose density functional approximations, augmenting the historically successful approach of human-designed functionals derived to obey mat... Read More about Exact constraints and appropriate norms in machine-learned exchange-correlation functionals.

Topological Analysis of Functions on Arbitrary Grids: Applications to Quantum Chemistry (2022)
Journal Article
Hutcheon, M. J., & Teale, A. M. (2022). Topological Analysis of Functions on Arbitrary Grids: Applications to Quantum Chemistry. Journal of Chemical Theory and Computation, 18(10), 6077-6091. https://doi.org/10.1021/acs.jctc.2c00649

Algorithms are presented for performing a topological analysis of an arbitrary function, evaluated on an arbitrary grid of points. These algorithms work strictly by post-processing the data and require no additional function evaluations. This is achi... Read More about Topological Analysis of Functions on Arbitrary Grids: Applications to Quantum Chemistry.

DFT exchange: sharing perspectives on the workhorse of quantum chemistry and materials science (2022)
Journal Article
Teale, A. M., Helgaker, T., Savin, A., Adamo, C., Aradi, B., Arbuznikov, A. V., …Yang, W. (2022). DFT exchange: sharing perspectives on the workhorse of quantum chemistry and materials science. Physical Chemistry Chemical Physics, 24(47), 28700-28781. https://doi.org/10.1039/d2cp02827a

In this paper, the history, present status, and future of density-functional theory (DFT) is informally reviewed and discussed by 70 workers in the field, including molecular scientists, materials scientists, method developers and practitioners. The... Read More about DFT exchange: sharing perspectives on the workhorse of quantum chemistry and materials science.

Structural and Electronic Studies of Substituted m-Terphenyl Group 12 Complexes (2022)
Journal Article
Valentine, A. J., Taylor, L. J., Geer, A. M., Huke, C. D., Wood, K. E., Tovey, W., …Kays, D. L. (2022). Structural and Electronic Studies of Substituted m-Terphenyl Group 12 Complexes. Organometallics, 41(11), 1426-1433. https://doi.org/10.1021/acs.organomet.2c00156

The effects of para-substitution on the structural and electronic properties of four series of two-coordinate m-terphenyl Group 12 complexes (R-Ar#)2M (M = Zn, Cd, Hg; R = t-Bu 1-3, SiMe34-6, Cl 7-9, CF310-12, where R-Ar#= 2,6-{2,6-Xyl}2-4-R-C6H2and... Read More about Structural and Electronic Studies of Substituted m-Terphenyl Group 12 Complexes.

Revealing the exotic structure of molecules in strong magnetic fields (2022)
Journal Article
Pemberton, M. J., Irons, T. J., Helgaker, T., & Teale, A. M. (2022). Revealing the exotic structure of molecules in strong magnetic fields. Journal of Chemical Physics, 156(20), Article 204113. https://doi.org/10.1063/5.0092520

A novel implementation for the calculation of molecular gradients under strong magnetic fields is employed at the current-density functional theory level to optimize the geometries of molecular structures, which change significantly under these condi... Read More about Revealing the exotic structure of molecules in strong magnetic fields.

Extending conceptual DFT to include external variables: the influence of magnetic fields (2022)
Journal Article
Francotte, R., Irons, T. J. P., Teale, A. M., de Proft, F., & Geerlings, P. (2022). Extending conceptual DFT to include external variables: the influence of magnetic fields. Chemical Science, 13(18), 5311-5324. https://doi.org/10.1039/d1sc07263c

An extension of conceptual DFT to include the influence of an external magnetic field is proposed in the context of a program set up to cope with the ever increasing variability of reaction conditions and concomitant reactivity. The two simplest glob... Read More about Extending conceptual DFT to include external variables: the influence of magnetic fields.

Topological Analysis of Magnetically Induced Current Densities in Strong Magnetic Fields Using Stagnation Graphs (2021)
Journal Article
Irons, T. J. P., Garner, A., & Teale, A. M. (2021). Topological Analysis of Magnetically Induced Current Densities in Strong Magnetic Fields Using Stagnation Graphs. Chemistry, 3(3), 916-934. https://doi.org/10.3390/chemistry3030067

Stagnation graphs provide a useful tool to analyze the main topological features of the often complicated vector field associated with magnetically induced currents. Previously, these graphs have been constructed using response quantities appropriate... Read More about Topological Analysis of Magnetically Induced Current Densities in Strong Magnetic Fields Using Stagnation Graphs.

Self-Consistent Field Methods for Excited States in Strong Magnetic Fields: A Comparison Between Energy- and Variance-based Approaches (2021)
Journal Article
David, G., Irons, T. J., Fouda, A. E., Furness, J. W., & Teale, A. M. (2021). Self-Consistent Field Methods for Excited States in Strong Magnetic Fields: A Comparison Between Energy- and Variance-based Approaches. Journal of Chemical Theory and Computation, 17(9), 5492-5508. https://doi.org/10.1021/acs.jctc.1c00236

Self-consistent field methods for excited states offer an attractive low-cost route to study not only excitation energies but also properties of excited states. Here, we present the generalization of two self-consistent field methods, the maximum ove... Read More about Self-Consistent Field Methods for Excited States in Strong Magnetic Fields: A Comparison Between Energy- and Variance-based Approaches.

Modeling Ultrafast Electron Dynamics in Strong Magnetic Fields Using Real-Time Time-Dependent Electronic Structure Methods (2021)
Journal Article
Wibowo, M., Irons, T. J. P., & Teale, A. M. (2021). Modeling Ultrafast Electron Dynamics in Strong Magnetic Fields Using Real-Time Time-Dependent Electronic Structure Methods. Journal of Chemical Theory and Computation, 17(4), 2137-2165. https://doi.org/10.1021/acs.jctc.0c01269

An implementation of real-time time-dependent Hartree-Fock (RT-TDHF) and current-density-functional theory (RT-TDCDFT) for molecules in strong uniform magnetic fields is presented. In contrast to earlier implementations, the present work enables the... Read More about Modeling Ultrafast Electron Dynamics in Strong Magnetic Fields Using Real-Time Time-Dependent Electronic Structure Methods.

Optimizing Molecular Geometries in Strong Magnetic Fields (2021)
Journal Article
Irons, T. J. P., David, G., & Teale, A. M. (2021). Optimizing Molecular Geometries in Strong Magnetic Fields. Journal of Chemical Theory and Computation, 17(4), 2166–2185. https://doi.org/10.1021/acs.jctc.0c01297

An efficient implementation of geometrical derivatives at the Hartree-Fock (HF) and current-density-functional theory (CDFT) levels is presented for the study of molecular structure in strong magnetic fields. The required integral derivatives are con... Read More about Optimizing Molecular Geometries in Strong Magnetic Fields.

Robust All-Electron Optimization in Orbital-Free Density-Functional Theory Using the Trust-Region Image Method (2020)
Journal Article
Ryley, M. S., Withnall, M., Irons, T. J. P., Helgaker, T., & Teale, A. M. (2021). Robust All-Electron Optimization in Orbital-Free Density-Functional Theory Using the Trust-Region Image Method. Journal of Physical Chemistry A, 125(1), 459-475. https://doi.org/10.1021/acs.jpca.0c09502

We present a Gaussian-basis implementation of orbital-free density-functional theory (OF-DFT) in which the trust-region image method (TRIM) is used for optimization. This second-order optimization scheme has been constructed to provide benchmark all-... Read More about Robust All-Electron Optimization in Orbital-Free Density-Functional Theory Using the Trust-Region Image Method.

Structural and electronic studies of substituted m-terphenyl lithium complexes (2020)
Journal Article
Valentine, A. J., Geer, A. M., Taylor, L. J., Teale, A. M., Wood, K. E., Williams, H. E. L., …Kays, D. L. (2021). Structural and electronic studies of substituted m-terphenyl lithium complexes. Dalton Transactions, 50(2), 722-728. https://doi.org/10.1039/d0dt03972a

The effect of para-substitution upon the structural and electronic properties of a series of m-terphenyl lithium complexes [R-Ar#-Li]2 (R = t-Bu 1, SiMe32, H 3, Cl 4, CF35; where R-Ar# = 2,6-{2,6-Xyl}2-4-R-C6H2 and 2,6-Xyl = 2,6-Me2C6H3) has been inv... Read More about Structural and electronic studies of substituted m-terphenyl lithium complexes.

Analyzing Magnetically Induced Currents in Molecular Systems Using Current-Density-Functional Theory (2020)
Journal Article
Irons, T. J. P., Spence, L., David, G., Speake, B. T., Helgaker, T., & Teale, A. M. (2020). Analyzing Magnetically Induced Currents in Molecular Systems Using Current-Density-Functional Theory. Journal of Physical Chemistry A, 124(7), 1321-1333. https://doi.org/10.1021/acs.jpca.9b10833

A suite of tools for the analysis of magnetically induced currents is introduced. These are applicable to both the weak-field regime, well described by linear response perturbation theory, and to the strong-field regime, which is inaccessible to such... Read More about Analyzing Magnetically Induced Currents in Molecular Systems Using Current-Density-Functional Theory.

GW quasiparticle energies of atoms in strong magnetic fields (2019)
Journal Article
Holzer, C., Teale, A. M., Hampe, F., Stopkowicz, S., Helgaker, T., & Klopper, W. (2019). GW quasiparticle energies of atoms in strong magnetic fields. Journal of Chemical Physics, 150(21), Article 214112. https://doi.org/10.1063/1.5093396

Quasiparticle energies of the atoms H–Ne have been computed in the GW approximation in the presence of strong magnetic fields with field strengths varying from 0 to 0.25 atomic units (0.25 B 0 =0.25 ℏe −1 a −2 0 ≈58 763 0.25 B0=0.25 ℏe−1a0−2≈58 763 T... Read More about GW quasiparticle energies of atoms in strong magnetic fields.

Kohn–Sham energy decomposition for molecules in a magnetic field (2018)
Journal Article
Reimann, S., Borgoo, A., Austad, J., Tellgren, E. I., Teale, A. M., Helgaker, T., & Stopkowicz, S. (2019). Kohn–Sham energy decomposition for molecules in a magnetic field. Molecular Physics, 117(1), 97-109. https://doi.org/10.1080/00268976.2018.1495849

We study the total molecular electronic energy and its Kohn–Sham components within the framework of magnetic-field density-functional theory (BDFT), an alternative to current-dependent density-functional theory (CDFT) for molecules in the presence of... Read More about Kohn–Sham energy decomposition for molecules in a magnetic field.

Accelerating Kohn–Sham response theory using density fitting and the auxiliary-density-matrix method (2018)
Journal Article
Kumar, C., Fliegl, H., Jensen, F., Teale, A. M., Reine, S., & Kjaergaard, T. (in press). Accelerating Kohn–Sham response theory using density fitting and the auxiliary-density-matrix method. International Journal of Quantum Chemistry, https://doi.org/10.1002/qua.25639

An extension of the formulation of the atomic‐orbital‐based response theory of Larsen et al., JCP 113, 8909 (2000) is presented. This new framework has been implemented in LSDalton and allows for the use of Kohn‐Sham density‐functional theory with ap... Read More about Accelerating Kohn–Sham response theory using density fitting and the auxiliary-density-matrix method.

Excitation energies from Görling–Levy perturbation theory along the range-separated adiabatic connection (2018)
Journal Article
Rebolini, E., Teale, A. M., Helgaker, T., Savin, A., & Toulouse, J. (2018). Excitation energies from Görling–Levy perturbation theory along the range-separated adiabatic connection. Molecular Physics, 116(11), 1443-1451. https://doi.org/10.1080/00268976.2017.1422811

A Görling–Levy (GL)-based perturbation theory along the range-separated adiabatic connection is assessed for the calculation of electronic excitation energies. In comparison with the Rayleigh–Schrödinger (RS)-based perturbation theory this GL-based p... Read More about Excitation energies from Görling–Levy perturbation theory along the range-separated adiabatic connection.

Uniform magnetic fields in density-functional theory (2018)
Journal Article
Tellgren, E. I., Laestadius, A., Helgaker, T., Kvaal, S., & Teale, A. M. (2018). Uniform magnetic fields in density-functional theory. Journal of Chemical Physics, 148, Article 024101. https://doi.org/10.1063/1.5007300

We construct a density-functional formalism adapted to uniform external magnetic fields that is intermediate between conventional Density Functional Theory and Current-Density Functional Theory (CDFT). In the intermediate theory, which we term LDFT,... Read More about Uniform magnetic fields in density-functional theory.

Connections between variation principles at the interface of wave-function and density-functional theories (2017)
Journal Article
Irons, T. J., Furness, J. W., Ryley, M. S., Zemen, J., Helgaker, T., & Teale, A. M. (2017). Connections between variation principles at the interface of wave-function and density-functional theories. Journal of Chemical Physics, 147(13), Article 134107. https://doi.org/10.1063/1.4985883

A recently proposed variation principle [N. I. Gidopoulos, Phys. Rev. A 83, 040502(R) (2011)] for the determination of Kohn–Sham effective potentials is examined and ex- tended to arbitrary electron-interaction strengths and to mixed states. Comparis... Read More about Connections between variation principles at the interface of wave-function and density-functional theories.

Magnetic-field density-functional theory (BDFT): lessons from the adiabatic connection (2017)
Journal Article
Reimann, S., Borgoo, A., Tellgren, E. I., Teale, A. M., & Helgaker, T. (2017). Magnetic-field density-functional theory (BDFT): lessons from the adiabatic connection. Journal of Chemical Theory and Computation, 13(9), 4089-4100. https://doi.org/10.1021/acs.jctc.7b00295

We study the effects of magnetic fields in the context of magnetic field density-functional theory (BDFT), where the energy is a functional of the electron density p and the magnetic field B. We show that this approach is a worthwhile alternative to... Read More about Magnetic-field density-functional theory (BDFT): lessons from the adiabatic connection.

Efficient calculation of molecular integrals over London atomic orbitals (2017)
Journal Article
Irons, T. J., Zemen, J., & Teale, A. M. (in press). Efficient calculation of molecular integrals over London atomic orbitals. Journal of Chemical Theory and Computation, https://doi.org/10.1021/acs.jctc.7b00540

The use of London atomic orbitals (LAOs) in a non-perturbative manner enables the determination of gauge-origin invariant energies and properties for molecular species in arbitrarily strong magnetic fields. Central to the efficient implementation of... Read More about Efficient calculation of molecular integrals over London atomic orbitals.

Interpolated energy densities, correlation indicators and lower bounds from approximations to the strong coupling limit of DFT (2017)
Journal Article
Vuckovic, S., Irons, T. J., Wagner, L. O., Teale, A. M., & Gori-Giorgi, P. (2017). Interpolated energy densities, correlation indicators and lower bounds from approximations to the strong coupling limit of DFT. Physical Chemistry Chemical Physics, 19, https://doi.org/10.1039/C6CP08704C

We investigate the construction of approximated exchange-correlation functionals by interpolating locally along the adiabatic connection between the weak- and the strong-coupling regimes, focussing on the effect of using approximate functionals for t... Read More about Interpolated energy densities, correlation indicators and lower bounds from approximations to the strong coupling limit of DFT.

Exchange–Correlation Functionals via Local Interpolation along the Adiabatic Connection (2016)
Journal Article
Vuckovic, S., Irons, T. J., Savin, A., Teale, A. M., & Gori-Giorgi, P. (2016). Exchange–Correlation Functionals via Local Interpolation along the Adiabatic Connection. Journal of Chemical Theory and Computation, 12(6), 2598-2610. https://doi.org/10.1021/acs.jctc.6b00177

The construction of density-functional approximations is explored by modeling the adiabatic connection locally, using energy densities defined in terms of the electrostatic potential of the exchange?correlation hole. These local models are more amena... Read More about Exchange–Correlation Functionals via Local Interpolation along the Adiabatic Connection.

Electron localisation function in current-density-functional theory (2016)
Journal Article
Furness, J. W., Ekström, U., Helgaker, T., & Teale, A. M. (2016). Electron localisation function in current-density-functional theory. Molecular Physics, 114(7-8), 1415-1422. https://doi.org/10.1080/00268976.2015.1133859

We present a generalisation of the electron localisation function (ELF) to current-density-functional theory as a descriptor for the properties of molecules in the presence of magnetic fields. The resulting current ELF (cELF) is examined for a range... Read More about Electron localisation function in current-density-functional theory.

The coupling constant averaged exchange–correlation energy density (2015)
Journal Article
Irons, T. J., & Teale, A. M. (2016). The coupling constant averaged exchange–correlation energy density. Molecular Physics, 114(3-4), 1-14. https://doi.org/10.1080/00268976.2015.1096424

The exchange–correlation energy, central to density-functional theory, may be represented in terms of the coupling constant averaged (CCA) exchange–correlation energy density. We present an approach to calculate the CCA energy density using accurate... Read More about The coupling constant averaged exchange–correlation energy density.

Molecular properties in the Tamm–Dancoff approximation: indirect nuclear spin–spin coupling constants (2015)
Journal Article
Cheng, C. Y., Ryley, M. S., Peach, M. J., Tozer, D. J., Helgaker, T., & Teale, A. M. (2015). Molecular properties in the Tamm–Dancoff approximation: indirect nuclear spin–spin coupling constants. Molecular Physics, 113(13-14), 1937-1951. https://doi.org/10.1080/00268976.2015.1024182

The Tamm-Dancoff approximation (TDA) can be applied to the computation of excitation energies using time-dependent Hartree-Fock (TD-HF) and time-dependent density-functional theory (TD-DFT). In addition to simplifying the resulting response equations... Read More about Molecular properties in the Tamm–Dancoff approximation: indirect nuclear spin–spin coupling constants.

Excited states from range-separated density-functional perturbation theory (2015)
Journal Article
Rebolini, E., Toulouse, J., Teale, A. M., Helgaker, T., & Savin, A. (2015). Excited states from range-separated density-functional perturbation theory. Molecular Physics, 113(13-14), 1740-1749. https://doi.org/10.1080/00268976.2015.1011248

We explore the possibility of calculating electronic excited states by using perturbation theory along a range-separated adiabatic connection. Starting from the energies of a partially interacting Hamiltonian, a first-order correction is defined with... Read More about Excited states from range-separated density-functional perturbation theory.

New CHARMM force field parameters for dehydrated amino acid residues, the key to lantibiotic molecular dynamics simulations (2014)
Journal Article
Turpin, E. R., Mulholland, S., Teale, A. M., Bonev, B. B., & Hirst, J. D. (2014). New CHARMM force field parameters for dehydrated amino acid residues, the key to lantibiotic molecular dynamics simulations. RSC Advances, 4(89), 48621-48631. https://doi.org/10.1039/c4ra09897h

Lantibiotics are an important class of naturally occurring antimicrobial peptides containing unusual dehydrated amino acid residues. In order to enable molecular dynamics simulations of lantibiotics, we have developed empirical force field parameters... Read More about New CHARMM force field parameters for dehydrated amino acid residues, the key to lantibiotic molecular dynamics simulations.

Differentiable but exact formulation of density-functional theory (2014)
Journal Article
Kvaal, S., Ekström, U., Teale, A. M., & Helgaker, T. (2014). Differentiable but exact formulation of density-functional theory. Journal of Chemical Physics, 140(18), Article 18A518. https://doi.org/10.1063/1.4867005

The universal density functional F of density-functional theory is a complicated and ill-behaved function of the density—in particular, F is not differentiable, making many formal manipulations more complicated. While F has been well characterized in... Read More about Differentiable but exact formulation of density-functional theory.

Non-perturbative calculation of molecular magnetic properties within current-density functional theory (2014)
Journal Article
Tellgren, E. I., Teale, A. M., Furness, J. W., Lange, K., Ekström, U., & Helgaker, T. (2014). Non-perturbative calculation of molecular magnetic properties within current-density functional theory. Journal of Chemical Physics, 140(3), https://doi.org/10.1063/1.4861427

We present a novel implementation of Kohn-Sham density-functional theory utilizing London atomic orbitals as basis functions. External magnetic elds are treated non-perturbatively, which enables the study of both magnetic response properties and the... Read More about Non-perturbative calculation of molecular magnetic properties within current-density functional theory.

Atomic electron affinities and the role of symmetry between electron addition and subtraction in a corrected Koopmans approach (2014)
Journal Article
Teale, A. M., De Proft, F., Geerlings, P., & Tozer, D. J. (2014). Atomic electron affinities and the role of symmetry between electron addition and subtraction in a corrected Koopmans approach. Physical Chemistry Chemical Physics, 16(28), https://doi.org/10.1039/C3CP54528H

The essential aspects of zero-temperature grand-canonical ensemble density-functional theory are reviewed in the context of spin-density-functional theory and are used to highlight the assumption of symmetry between electron addition and subtraction... Read More about Atomic electron affinities and the role of symmetry between electron addition and subtraction in a corrected Koopmans approach.