Accurate wavenumbers of the first resonance doublet of francium atoms and relativistic contribution to isotope shifts in the resonance doublets of francium and caesium atoms, J Bauche, H T Duong, P Juncar, S Liberman, J Pinard, A Coc, C Thibault, F Touchard, J Lerme, J L Vialle, S Buttgenbach, A C Mueller, A Pesnelle
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Bauche et al. (1986) studied this question.
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