Convergence studies of atomic properties from variational methods: total energy, ionization energy, specific mass shift, and hyperfine parameters for Li

• Systematic variational calculations using the multi-configuration Hartree-Fock method for Li are reported. For 1 s 2 2 s 2 S of Li, an nl -expansion is attempted in configuration space, similar to a partial wave expansion for helium-like systems. The total energy, ionization energy, specific mass shift, and hyperfine contact term are calculated with respect to increasing size of the configuration set. A comparison is made with n -expansion in configuration space, which is found to be the more efficient method. The total energy obtained from our variational procedure is lower than that of a previously reported partial wave study on ground state of Li. Similar n -expansion studies are performed for 1 s 2 2 p 2 P . For the latter, the 2 s -2 p transition integrals are reported, showing convergence of the transition energy as well as the length and velocity form of the f -value.

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NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

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