Abstract
Three-step resonance excitation to autoionization states is a promising isotope-selective ionization technique for atomic strontium (Sr). We measured for the first time the DC Stark shifts of ten Rydberg levels (neff∼36−39,50−55) of 88Sr converging to the 4d 2D3/2 limit using the 5s21S0→ 5s5p 1P1∘→ 5p21D2→ (4d 2D3/2 Rydberg series) transition pathway. The polarizability α of each level was evaluated to be |α|∼10−30−10−28 [C2·m2·J−1] depending on the effective principal quantum number neff, which indicates that the external electric field E in the ionization region should be of the order of 0.1 V/cm or less to suppress its effect on the observed spectra. Our experimental data on the DC Stark shift and polarizability of the Rydberg levels are useful for future isotope-selective detection of the radioisotope 90Sr using three-step resonance excitation.
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