Abstract
Two-photon Doppler-free spectroscopy has been used to measure Stark shifts of n 2 S Rydberg states of 85 Rb (for n =15  to  80 ). Scalar polarizabilities α 0 were found to obey the relation α 0 in MHz /(V/cm) 2 =2.202(28)×10 -9 n *6 +5.53(13)×10 -11 n *7 , in good agreement with theoretical values. Avoided crossings were also determined, and first avoided crossings (with the n -3 manifold of levels) fitted the relation E (in V /cm)=4.638(6)×10 8 / n *5 +1.528(18)×10 10 / n *7 .
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