Abstract
The complicated quadratic Zeeman spectrum in a laboratory magnetic field is analyzed with the aid of accurate Coulomb functions. Different Rydberg manifolds are masked by the generalized Gailitis average based on the multichannel quantum-defect theory. Fundamental resonances are thereby accentuated. An efficient and reliable numerical procedure is developed for evaluating the negative-energy Coulomb functions and their derivatives. The method is based on the three-term recursions and employs Steed's forward-propagation method [A. R. Barnett et al., Comput. Phys. Commun. 8, 377 (1974)] as well as the backward-propagation method of Stegun and Abramowitz [Phys. Rev. 98, 1851 (1955)].
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