Basis set convergence in extended systems: infinite hydrogen fluoride and hydrogen chloride chains

Details Basis set convergence in extended systems: infinite hydrogen fluoride and hydrogen chloride chains Basis set convergence in extended systems: infinite hydrogen fluoride and hydrogen chloride chains

2004-08-11

arxiv.org/abs/cond-mat/0408243v2

Chem. Phys. Lett. 398, 44--49 (2004)

Physics

Condensed Matter

Other Condensed Matter

12 pages, 4 figures, 4 tables, LaTeX, corrected typos

Scientific paper

10.1016/j.cplett.2004.08.135

Basis set convergence of the Hartree-Fock and the correlation energy is examined for the hydrogen bonded infinite bent chains (HF)_infinity and (HCl)_infinity. We employ series of correlation consistent basis sets up to quintuple zeta quality together with a coupled cluster method (CCSD) to describe electron correlation on ab initio level. The Hartree-Fock energy converges rapidly with increasing basis set quality whereas the correlation energy is found to be slowly convergent for the same series of basis sets. We study basis set extrapolation for (HF)_infinity and (HCl)_infinity and show that it substantially enhances the accuracy of both the Hartree-Fock and the correlation energy in extended systems.

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