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Fine structure intervals connecting n = 19 Rydberg levels of Si+ with L between 9 and 16 were measured precisely using the RESIS/microwave technique. The fine structure pattern conforms closely with that predicted by an effective potential model, and indicates a value of 11.666(4)a30 for the adiabatic dipole polarizability of the Mg-like ion, Si2+.
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Komara et al. (2005) studied this question.
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