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.
@article{arxiv.2209.07853,
title = {The electronic system $(2)^2\Sigma^+$ and $(1)^2\Pi$ of LiCa},
author = {J. Gerschmann and E. Schwanke and S. Ospelkaus and E. Tiemann},
journal= {arXiv preprint arXiv:2209.07853},
year = {2022}
}