We investigated the 3s'ns 'S, 3s'nd 'D and the 3s2nf 'F series in aluminium. These high levels were populated by three-photon two-step excitations using the 3s24p 2P3,2 as the intermediate state. We determined the positions of the series members accurately for n values between 28 and 60. The 'S and the *F series are not perturbed. The quantum defect of the ' S series is confirmed to be 1.728 (2), the quantum defect of the 2F series is 0.041 (2). The perturbation of the 2 D series is demonstrated by the variation of the quantum defect over the series, and by the fine structure (FS) of the *D levels which is measured for n < 37. The large positive splitting is shown to be explained by taking into account the fine structure ofthe 3s3p2 'D perturber. Using simple arguments the percentage of admixture of 3s3p2'D to the 3s'nd'D series can be determined while the FS of the perturber is estimated to be 20.5 cm-'.
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