Abstract
A polyisotopic sodium beam of $^{21\ensuremath{-}25}\mathrm{Na}$, produced by spallation of Al, was illuminated with a tunable cw dye laser. The atomic beam, analyzed by a six-pole magnet is then ionized and detected by use of a mass spectrometer. The results are as follows: isotopic shifts relative to $^{23}\mathrm{Na}$, $^{21}\mathrm{Na}$=-53.5 mK, $^{22}\mathrm{Na}$=-25.3 mK, $^{24}\mathrm{Na}$=+23.1 mK, $^{25}\mathrm{Na}$=+44.6 mK; ${\ensuremath{\mu}}_{I}(^{25}\mathrm{Na})=+3.685(22){\ensuremath{\mu}}_{N}$; $b$ factor in the ${P}_{\frac{3}{2}}$ state of $^{25}\mathrm{Na}$=-16(8) MHz.
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