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 Title CERES: An ab initio code dedicated to the calculation of the electronic structure and magnetic properties of lanthanide complexes Publication Type Journal Article Year of Publication 2018 Authors Calvello, S, Piccardo, M, Rao, SVittal, Soncini, A Journal Journal of Computational Chemistry Volume 39 Pagination 328–337 Date Published mar ISSN 01928651 Abstract We have developed and implemented a new ab initio code, CERES (Computational Emulator of Rare Earth Systems), completely written in C++11, which is dedicated to the efficient calculation of the electronic structure and magnetic properties of the crystal field states arising from the splitting of the ground state spin-orbit multiplet in lanthanide complexes. The new code gains efficiency via an optimised implementation of a direct configurational averaged Hartree-Fock (CAHF) algorithm for the determination of {\$}4f{\$} quasi-atomic active orbitals common to all multi-electron spin manifolds contributing to the ground spin-orbit multiplet of the lanthanide ion. The new CAHF implementation is based on quasi-Newton convergence acceleration techniques coupled to an efficient library for the direct evaluation of molecular integrals, and problem-specific density matrix guess strategies. After describing the main features of the new code, we compare its efficiency with the current state–of–the–art ab initio strategy to determine crystal field levels and properties, and show that our methodology, as implemented in CERES, represents a more time-efficient computational strategy for the evaluation of the magnetic properties of lanthanide complexes, also allowing a full representation of non-perturbative spin-orbit coupling effects. URL http://arxiv.org/abs/1709.10315 http://doi.wiley.com/10.1002/jcc.25113 DOI 10.1002/jcc.25113
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