MolSOC: A spinorbit coupling code ?
A description of the theoretical background, the numerical algorithm and the input/output files structures of the computer program MolSOC is presented. This code provides an efficient tool for the spinorbit (SO) coupling treatment in many-electron systems by a non-iterative method implementation. Preliminary versions of the MolSOC program have been already tested and successfully applied in the framework of density functional theory (DFT). SO calculations can be performed either employing a full SO operator or a reduced screened nuclear-charge operator. With the second option, the required computational time can be significantly reduced. However, it has been previously demonstrated that the full SO operator can be successfully applied to extended molecular systems. Finally, practical instructions for the program use are also included. Program title: MolSOC v0.1 Catalogue identifier: AERK_v1_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AERK_v1_0.html Program obtainable from: CPC Program Library, Queens University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 13333 No. of bytes in distributed program, including test data, etc.: 2301930 Distribution format: tar.gz Programming language: Fortran 90. Computer: All Linux based workstations. Operating system: Linux. Classification: 16.1. External routines: Subset of BLAS and LAPACK routines (included in the distribution file). Nature of problem: An accurate description of the electronic structure of heavy many electron systems requires, very often, the inclusion of the spinorbit coupling contributions. Solution method: SpinOrbit matrix elements can be computed between optimized states at the density functional theory level using the full BreitPauli operator or a reduced screened nuclear-charge operator. Running time: It depends on the size of the chemical system, on the basis set used and on the computational method used. The tests included only take seconds or a few minutes to run.
spinorbit coupling density functional theory (dft) breitpauli operator molsoc molsoc reduced screened-nuclear charge operator