Abstract
We present results of microwave and millimetre-wave resonance measurements in D, F and G Rydbergstates of neutral aluminium in the frequency range 4–423 GHz for principal quantum numbersn = 22–43. In all, 12, 27 and 19 resonances of or , or and or series, respectively, have been recorded. D-state fine-structure doublet splittings have been obtained withaccuracy ± 1.4 MHz. For D and G states, quantum defect Ritz-expansion parameters have been determined,from which the Rydberg series can be accurately reconstructed to an accuracy of order ± 1 MHz(3 × 10−5 cm−1) forall n.
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