Study of quadrupole polarizabilities with combined configuration interaction and coupled-cluster method

Abstract

The recently developed method combining the configuration interaction and the coupled-cluster method was demonstrated to provide accurate treatment of correlation corrections in divalent atomic systems [M.S.Safronova, M.G.Kozlov, and C.W.Clark, Phys. Rev. Lett. 107, 143006 (2011)]. We have extended this approach to the calculation of quadrupole polarizabilities alpha_2 and applied it to evaluate alpha_2 for the ground state of Mg and Mg-like Si^{2+}. Performing the calculations in three different approximations of increasing accuracy allowed us to place the upper bounds on the uncertainty of the final results. The recommended values alpha_2(3s^2 1S0)= 35.86(13) a.u. for Si^{2+} and alpha_2(3s^2 1S0)= 814(3) a.u. for Mg are estimated to be accurate to 0.37%. Differences in quadrupole polarizability contributions in neutral Mg and Si^{2+} ion are discussed.

6 pages, submitted to Phys. Rev. A

References in corpus (8)

• Development of a configuration-interaction + all-order method for atomic calculations
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• Polarizabilities of Si^{2+}: a benchmark test of theory and experiment
• Anomalously small blackbody radiation shift in Tl+ frequency standard
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• Polarizabilities of Rn-like Th4+ from rf spectroscopy of Th3+ Rydberg levels
• Polarizabilities of the Mg${}^{+}$ and Si${}^{3+}$ ions

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• Finite-field calculation of the polarizabilities and hyperpolarizabilities of Al${}^{+}$
• Precision measurement of the ${}^3{D}_1$ and ${}^3{D}_2$ quadrupole moments in Lu${}^{+}$
• Atomic diffraction by light gratings with very short wavelengths