The electronic system $(2)^2Σ^+$ and $(1)^2Π$ of LiCa
High resolution Fourier transform spectroscopy and Laser induced fluorescence has been performed on LiCa in the infrared spectral range. We analyze rovibrational transitions of the $(2)^2Σ^+$--$X(1)^2Σ^+$ system of LiCa and find the $(2)^2Σ^+$ state to be perturbed by spin-orbit coupling to the $(1)^2Π$ state. We study the coupled system obtaining molecular parameters for the $(2)^2Σ^+$ and the $(1)^2Π$ state together with effective spin-orbit and spin-rotation coupling constants. The coupled system has also been evaluated by applying a potential function instead of rovibrational molecular parameters for the state $(2)^2Σ^+$. An improved analytic potential function of the $X(1)^2Σ^+$ state is derived, due to the extension of the observed rotational ladder.