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In computer software, FreeON is an experimental, open source (GPL) suite of programs for linear scaling quantum chemistry, formerly known as MondoSCF. It is highly modular, and has been written from scratch for N-scaling SCF theory in Fortran95 and C. Platform independent IO is supported with HDF5. FreeON should compile with most modern Linux distributions. FreeON performs Hartree–Fock, pure density functional, and hybrid HF/DFT calculations (e.g. B3LYP) in a Cartesian-Gaussian LCAO basis. All algorithms are O(N) or O(N lg N) for non-metallic systems.[1][2][3][4][5][6][7] Periodic boundary conditions in 1, 2 and 3 dimensions have been implemented through the Lorentz field (-point), and an internal coordinate geometry optimizer allows full (atom+cell) relaxation using analytic derivatives. Effective core potentials for energies and forces have been implemented, but Effective Core Potential (ECP) lattice forces do not work yet. Advanced features include O(N) static and dynamic response, as well as time reversible Born Oppenheimer Molecular Dynamics (MD).
Developers[]
Developer
Affiliation
Matt Challacombe
Los Alamos National Laboratory
Eric Schwegler
Lawrence Livermore National Laboratory
C. J. Tymczak
Texas Southern University
Anders M. Niklasson
Los Alamos National Laboratory
Anders Odell
KTH Stockholm
Nicolas Bock
Los Alamos National Laboratory
Karoly Nemeth
Argonne National Laboratory
Valery Weber
University of Zurich
C. K. Gan
Institute for High Performance Computing
Graeme Henkelman
University of Texas at Austin
Robert Snavely
University of Santa Cruz
See also[]
List of quantum chemistry and solid state physics software
References[]
^Challacombe, M.; Schwegler, E.; Almlöf, J. (1996). "Fast assembly of the Coulomb matrix: A quantum chemical tree code". The Journal of Chemical Physics. 104 (12): 4685. Bibcode:1996JChPh.104.4685C. doi:10.1063/1.471163.
^Schwegler, E.; Challacombe, M. (1996). "Linear scaling computation of the Hartree–Fock exchange matrix". The Journal of Chemical Physics. 105 (7): 2726. Bibcode:1996JChPh.105.2726S. doi:10.1063/1.472135.
^Challacombe, M.; Schwegler, E. (1997). "Linear scaling computation of the Fock matrix". The Journal of Chemical Physics. 106 (13): 5526. Bibcode:1997JChPh.106.5526C. doi:10.1063/1.473575.
^Schwegler, E.; Challacombe, M.; Head-Gordon, M. (1997). "Linear scaling computation of the Fock matrix. II. Rigorous bounds on exchange integrals and incremental Fock build". The Journal of Chemical Physics. 106 (23): 9708. Bibcode:1997JChPh.106.9708S. doi:10.1063/1.473833.
