Abstract
We study the electron correlation effects in the calculations of isotope shifts in Na and Mg+ using the relativistic coupled-cluster method. The trends of the correlation effects are explicitly discussed and comparison of the present results with the previously reported results are given. We also present the fine structure constant variation coefficients for many states in the above systems. From these results, it is possible to find out suitable transition lines those can be used as anchor and probe lines in finding possible variation in the fine structure constant.
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