Abstract
In this investigation, term values in sodium are found by numerical integration of Schr\"odinger's wave equation. Effective core polarizabilities are determined by fitting calculations to experimental data. The fit includes quantum defects in low-angular-momentum states which were not previously used. When penetration and exchange are taken into account and the effective dipole and quadrupole polarizabilities are corrected for nonadiabatic effects, the dipole and quadrupole polarizabilities are found to be 0.998(100) and 1.36(40) a.u., respectively. Quantum defects and fine structure are also calculated for states not included in the initial fit and are found to be in good agreement with experimental results.
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