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We analyze rovibrational transitions of the (2) 2Σ+ - X(1) 2Σ+ system of LiSr and find the energy levels of the \bstate\ state to be perturbed by coupling between the (2) 2Σ+ and (1) 2Π states. We present an analysis of the coupled system yielding molecular parameters for the lowest vibrational levels of the (2) 2Σ+ state and for higher vibrational levels of the (1) 2Π state together with molecular coupling constants. Improved Dunham coefficients for the rovibrational levels of the X(1) 2Σ+ state are also obtained, where the correlation with the parameters of the excited states is removed completely.

The coupled system (2)2Σ+ and (1)2Π of 7Li88Sr

The coupled system (2)²Σ⁺ and (1)²Π of ⁷Li⁸⁸Sr