Polarisation labelling spectroscopy technique was employed to study the 31Πu state of Cs2 molecule. The main equlibrium constants are Te=20684.60cm−1, ωe=30.61cm−1 and Re=5.27\r{A}. Vibrational levels v=4−35 of the 31Πu state were found to be subject to strong perturbations by the neighbouring electronic states. Energies of 3094 rovibronic levels of the perturbed complex were determined.
@article{arxiv.2101.12728,
title = {On the 3$^{1}\Pi_{u}$ state in caesium dimer},
author = {Jacek Szczepkowski and Anna Grochola and Wlodzimierz Jastrzebski and Pawel Kowalczyk},
journal= {arXiv preprint arXiv:2101.12728},
year = {2021}
}