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Electron-correlation effects in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>g</mml:mi></mml:math> factor of light Li-like ions
We investigate electron-correlation effects in the $g$ factor of the ground state of Li-like ions. Our calculations are performed within the nonrelativistic quantum electrodynamics (NRQED) expansion up to two leading orders in the fine-structure constant $\ensuremath{\alpha}, {\ensuremath{\alpha}}^{2}$, and ${\ensuremath{\alpha}}^{3}$. The dependence of the NRQED results on the nuclear charge number …