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Transition frequencies of Fe II ion are known to be very sensitive tovariation of the fine structure constant \alpha. The resonance absorption linesof Fe II from objects at cosmological distances are used in a search for thepossible variation of \alpha in cause of cosmic time. In this paper wecalculated the dependence of the transition frequencies on \alpha^2 (q-factors)for Fe II ion. We found corrections to these coefficients from valence-valenceand core-valence correlations and from the Breit interaction. Both thecore-valence correlation and Breit corrections to the q-factors appeared to belarger than had been anticipated previously. Nevertheless our calculationconfirms that the Fe II absorption lines seen in quasar spectra have largeq-factors of both signs and thus the ion Fe II alone can be used in the searchfor the \alpha-variation at different cosmological epochs.

Transition frequency shifts with fine structure constant variation for Fe II: Breit and core-valence correlation correction