The coupled system (2)(2)sigma(+) and (1)(2)pi of (LiSr)-Li-7-Sr-88

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