Isotope shifts in odd and even energy levels of the neutral and singly ionised gadolinium atom |
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Authors: | S.A. Ahmad A. Venugopalan G.D. Saksena |
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Affiliation: | Spectroscopy Division, Bhabha Atomic Research Centre, Trombay, Bombay-400 085, India |
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Abstract: | Isotope shift studies in the gadolinium spectra have been extended in the region 4140–4535 Å. Isotope shift Δσ(156–160) have been measured in 315 lines of the neutral and singly ionised galolinium atom using a recording Fabry—Perot Spectrometer and gadolinium samples enriched in 156Gd and 160Gd isotopes. Some of the Gd I lines studied involve transitions from newly identified high odd levels of 4f86s 6p, 4f75d 6s 7s and 4f75d3 configurations to low even levels of 4f86s2 and 4f76s26p configurations. Electronic configurations of the energy levels have been discussed on the basis of observed isotope shifts. In some cases assigned configurations have been revised and probable configurations have been suggested. |
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