The Chronus Quantum software package
@article{WilliamsYoung2019TheCQ, title={The Chronus Quantum software package}, author={David B. Williams-Young and Alessio Petrone and Shichao Sun and Torin F. Stetina and Patrick J. Lestrange and Chad E. Hoyer and Daniel R. Nascimento and Lauren N. Koulias and Andrew Wildman and Joseph M. Kasper and Joshua J. Goings and Feizhi Ding and A. Eugene DePrince and Edward F. Valeev and Xiaosong Li}, journal={Wiley Interdisciplinary Reviews: Computational Molecular Science}, year={2019}, volume={10} }
The Chronus Quantum (ChronusQ) software package is an open source (under the GNU General Public License v2) software infrastructure which targets the solution of challenging problems that arise in ab initio electronic structure theory. Special emphasis is placed on the consistent treatment of time dependence and spin in the electronic wave function, as well as the inclusion of relativistic effects in said treatments. In addition, ChronusQ provides support for the inclusion of uniform finite…
37 Citations
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References
SHOWING 1-10 OF 145 REFERENCES
BAGEL: Brilliantly Advanced General Electronic‐structure Library
- Computer Science
- 2017
The capabilities of the Brilliantly Advanced General Electronic‐structure Library (BAGEL) program package are reviewed, which includes analytical CASPT2 nuclear energy gradients and derivative couplings, relativistic multireference wave functions based on the Dirac equation, and implementations of novel electronic structure theories.
Ab initio quantum dynamics using coupled-cluster.
- PhysicsThe Journal of chemical physics
- 2012
The coupled-cluster method overcomes the COD in the sense that the method scales polynomially with the number of particles while still being size-consistent and extensive, and is a hierarchy of approximations to the now standard multi-configurational time-dependent Hartree method for fermions.
An efficient implementation of two-component relativistic density functional theory with torque-free auxiliary variables
- PhysicsThe European Physical Journal B
- 2018
An integration and assembly strategy for efficient evaluation of the exchange correlation term in relativistic density functional theory within two-component Kohn–Sham framework is presented. Working…
Psi4 1.1: An Open-Source Electronic Structure Program Emphasizing Automation, Advanced Libraries, and Interoperability.
- Chemistry, Computer ScienceJournal of chemical theory and computation
- 2017
A wide range of new theoretical methods and analyses have been added to the code base, including functional-group and open-shell symmetry adapted perturbation theory, density-fitted coupled cluster with frozen natural orbitals, orbital-optimized perturbations and coupled-cluster methods, and the "X2C" approach to relativistic corrections, among many other improvements.
The Dalton quantum chemistry program system
- Chemistry, PhysicsWiley interdisciplinary reviews. Computational molecular science
- 2014
Dalton is a powerful general‐purpose program system for the study of molecular electronic structure at the Hartree–Fock, Kohn–Sham, multiconfigurational self‐consistent‐field, Møller–Plesset,…
Big picture of relativistic molecular quantum mechanics
- Physics
- 2016
Any quantum mechanical calculation on electronic structure ought to choose first an appropriate Hamiltonian H and then an Ansatz for parameterizing the wave function Ψ, from which the desired…
Perturbative calculation of spin-orbit splittings using the equation-of-motion ionization-potential coupled-cluster ansatz.
- PhysicsThe Journal of chemical physics
- 2008
To ensure computational efficiency, an atomic mean-field approximation for the spin-orbit integrals is used, resulting in a formulation in terms of one-electron transition-density matrices that lead to satisfactory agreement with experiment.
Relativistic Two-Component Particle-Particle Tamm-Dancoff Approximation.
- PhysicsJournal of chemical theory and computation
- 2016
The particle-particle Tamm-Dancoff approximation is extended to suit two-component Hamiltonians to explicitly treat relativistic effects in excited states to demonstrate the accuracy of this extension by evaluating the fine structure splittings some of atomic and molecular systems.
Quantum mechanical embedding theory based on a unique embedding potential.
- PhysicsThe Journal of chemical physics
- 2011
We remove the nonuniqueness of the embedding potential that exists in most previous quantum mechanical embedding schemes by letting the environment and embedded region share a common embedding…
Symplectic integration and physical interpretation of time-dependent coupled-cluster theory.
- PhysicsThe Journal of chemical physics
- 2019
The formulation of the time-dependent Schrödinger equation in terms of coupled-cluster theory is outlined, with emphasis on the bivariational framework and its classical Hamiltonian structure, and experiments indicate that a system-dependent upper limit exists for the external field strengths.