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Accurate results for nonrelativistic energy, relativistic, QED, and finitenuclear mass corrections are obtained for $2^1S_{1/2}$, $3^1S_{1/2}$ and$2^1P_{1/2}$ states of the Li atom and Be$^+$ ion. Our computational approachuses the Hylleraas basis set with the analytic integration and recursionrelations. From comparison of experimental results for the isotope shifts totheoretical predictions including nuclear polarizabilities, we obtain nuclearcharge radii for Li and Be isotopes.

Relativistic, QED, and finite nuclear mass corrections for low-lying states of Li and Be$^+$