Search Results for "hartree"

...Justin M. Turney and Prof. Henry F. Schaefer. This work is supported by the U.S. National Science Foundation under grant number CHE-1661604. Fermi focuses on post Hartree--Fock methods. Currently, only restricted references are supported. This is intended as a research code with an ever growing collection of methods implemented in the package itself. However, the Fermi API is designed to make high performance pilot implementations of methods achievable.

...Current version reads XYZ and deMon output files. Displays image of geometry, atomic orbitals, molecular orbitals, density and Fukui functions in a few different formats. In situ SCF Hartree-Fock calculations available.

QuMuLuS++ is an open source quantum chemistry program for calculating molecular properties with quantum chemical methods. It is intended for researchers, developers, and students who need access to the source code and want to study, extend, or apply electronic structure models. The current source can be obtained with Mercurial: hg clone http://hg.code.sf.net/p/qumulus/code qumulus-code For a first installation, follow the instructions in the INSTALL file included in the source...

Scalable Molecular Analysis Solver for High-performance computing systems (SMASH) is massively parallel software for quantum chemistry calculations and released under the Apache 2.0 open source license. It is currently capable of energy, analytical gradient, and geometry optimization calculations of Hartree-Fock theory and Density Functional Theory (DFT), and energy calculations of Second-order Moller-Plesset (MP2) perturbation theory. DFT calculations can be performed on 100,000 CPU cores with high parallel efficiency.

BasisFit extracts molecular orbitals from a GAMESS data file and constructs near-identical orbitals from an alternative basis set using least-squares fitting of the new basis functions to the old. This is particularly useful for generating physically sensible starting orbitals for CASSCF calculations from atomic minimal basis Hartree-Fock orbitals, but can be used to convert any converged set of orbitals from one basis to another.

...Discretization of the differential eigenvalue problem is done by finite element method with Lobatto polynomials as a basis functions. High order Gauss quadratures are applied in order to obtain the total energy of atom with absolut accuracy of 1E-6 hartree. Disctretization leads to generalized eigenvalue problem, which is solved by procedures from LAPACK libraries. The program is implemented in C++, it runs as a single thread. The implemented algorithm is described in the following papers: 1. Z. Romanowski, "Adaptive solver of a Kohn-Sham equation for an atom", Modelling Simul. ...

This is an extension to the standard 2D HF package (A Numerical Hartree-Fock Program for Diatomic Molecules by Jacek Kobus, Leif Laaksonen and Dage Sundholm) that adds some extra functionality.