Abstract
We have excited the 4D 3 2 and 4D 5 2 levels of sodium using Doppler-free two-photon excitation. By measuring the polarization rate in zero magnetic field of the fluorescence lines, we have deduced the following values for the hyperfine interaction |A( 4D 3 2 ) | = 0.23 ± 0.12 MHz and |A( 4D 5 2 )| < 0.28 MHz . The value of A( 4D 3 2 ) is in disagreement with the one reported by Schenk and Pillof.
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