We have observed the Stark effect in the 5s²S1/2 and 4d²D3/2,5/2 levels of sodium. Shifts as well as splittings were measured by use of two-photon spectroscopy in a short atomic beam. It was possible to separate uniquely the contributions from the neighboring p and f levels. The polarizabilities were found to be, in MHz/(kV/cm)², (a) 5s²S1/2, α₀=5.2(3), (b) 4d²D3/2, α₀=155.3(1.7) and α₂=-38.5(7), and (c) 4d²D5/2, α₀=156.1(1.3) and α₂=-53.2(5). From this the oscillator strengths f_4d→5p=0.274(29) and f_4d→4f=0.01885(24) are obtained.
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Harvey et al. (1975) studied this question.
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