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Study of quadrupole polarizabilities with combined configuration interaction and coupled-cluster method | | S. G. Porsev
; M. S. Safronova
; M. G. Kozlov
; | | Date: |
19 Mar 2012 | | 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. | | Source: | arXiv, 1203.4169 | | Services: | Forum | Review | PDF | Favorites | |
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