The potential energy barrier of the 2Π1 state in KLi

The polarisation labelling spectroscopy technique has provided detailed information about the shape of the potential barrier to dissociation of the 2Π1 state in KLi. The potential curve of the 2Π1 state is constructed using the Inverted Perturbation Approach method. Our analysis shows that the barrier height is ΔE=20.8±1.0 cm−1 relative to the dissociation limit and the barrier maximum is located at Rbar=8.2±0.1Rbar=8.2±0.1 Å.