Nuclear electric quadrupole moment of potassium from the molecular method

Author(s)

Teodoro, Tiago Quevedo ^{[1, 2]} ; Andrade Haiduke, Roberto Luiz ^[1] ; Visscher, Lucas ^[2]

Affiliation

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, Dept Quim & Fis Mol, BR-13560970 Sao Carlos, SP - Brazil

^[2] Vrije Univ Amsterdam, Amsterdam Ctr Multiscale Modeling, NL-1081 HV Amsterdam - Netherlands

• Document type: Journal article
• Source: Physical Review A; v. 91, n. 3 MAR 26 2015.
• Web of Science Citations: 3

Abstract

The current standard nuclear quadrupole moments (NQMs) of the K-39, K-40, and K-41 isotopes have recently been contested by Singh and co-workers on the basis of their atomic computational data. Thus we performed relativistic calculations of electric field gradients at the potassium nuclei in three diatomic molecules (KF, KCl, and KBr) and combined these values with accurate experimental nuclear quadrupole coupling constants to provide an independent assessment of these NQMs. Our most accurate results, obtained by treating electron correlation with coupled cluster theory, employing a four-component Hamiltonian that includes the Gaunt two-electron correction, and with an incremented relativistic basis set of quadruple-zeta quality, yield Q(K-39) = 60.3(6), Q(K-40) = -75.0(8), and Q(K-41) = 73.4(7) mb. These values are in better agreement with the results obtained by Singh et al. and indicate that the standard NQMs should be revised. (AU)

• FAPESP's process: 14/02939-5 - Application of polarized relativistic adapted Gaussian basis sets in accurate molecular relativistic calculations of potential energy curves
• Grantee: Tiago Quevedo Teodoro
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate