Spectroscopic study of the C(3)1Σ+ ← X1Σ+ and c(2)3Σ+ ← X1Σ+ transitions in KCs molecule

We present an experimental investigation of the C(3) 1 Sigma ?+ and c(2) 3 Sigma ?+ states of KCs using two-colour polarisation labelling spectroscopy (PLS) technique. Pointwise potential energy curves are generated for both states using the inverted perturbation approach (IPA) method. The experimental pointwise potentials and molecular constants Te , ωe and Re are compared with theoretical calculations.