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The theory is summarized and practical procedures of spectrum analysis are discussed. The He I spectrum is analysed using least-squares fitting procedures. An improved value of the series limit is obtained. Continuum phases obtained from extrapolation of quantum defect data are compared with phases calculated by Sloan in 1964 using polarized orbital theory. The Ca I 3 D 1 series is analysed using the two-channel theory and allowing for admixture of the configurations 4s n 1 d and 3d n 2 s. Good agreement with experimental energies can be obtained using a Y matrix which is a linear function of the energy. The structure of perturbations and resonances is discussed, particular attention being paid to the normalization properties of the wave functions.
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M. J. Seaton (1966) studied this question.
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