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Spectra of selected elements from Pd to Nd were observed with the TEXT tokamak at the University of Texas in Austin. Lines of the Rb i isoelectronic sequence were identified and wavelengths compared with calculated values obtained with the Cowan relativistic Hartree–Fock code. We made plots of observed minus calculated (O – C) transition energies in order to obtain smoothed wavelengths and interpolate values for elements not observed.
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Sugar et al. (1992) studied this question.
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