High-accuracy calculation of nuclear quadrupole moments of atomic halogens,

L. Visscher, H. Yakobi, E. Eliav, U. Kaldor

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Electric field gradients at the nuclei of halogen atoms are calculated using a finite field approach. The four-component Dirac-Coulomb Hamiltonian serves as the framework, all electrons are correlated by the relativistic Fock-space coupled cluster method with single and double excitations, and the Gaunt term, the main part of the Breit interaction, is included. Large basis sets (e.g., 28s24p21d9f4g2h Gaussian-type functions for I) are used. Combined with experimental nuclear quadrupole coupling constants, accurate estimates of the nuclear quadrupole moments are obtained. The calculated values are Q (Cl35) =-81.1 (1.2) mb, Q (Br79) =302 (5) mb, and Q (I127) =-680 (10) mb. Currently accepted reference values [Pyykkö, Mol. Phys. 99, 1617 (2001)] are -81.65 (80), 313(3), and -710 (10) mb, respectively. Our values are lower for the heavier halogens, corroborating the recent work of van Stralen and Visscher [Mol. Phys. 101, 2115 (2003)], who obtained Q (I127) =-696 (12) mb in a series of molecular calculations. © 2007 American Institute of Physics.
Original languageEnglish
Pages (from-to)054301
Number of pages4
JournalJournal of Chemical Physics
Issue number5
Publication statusPublished - 2007


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