Perturbation facilitated Infrared-Infrared double resonance spectroscopy has been used to study the triplet states of Cs2. The 33Πg state has been observed and rotationally resolved fluorescence spectra into the b3Πu state and the perturbed A1Σu+ levels have been recorded. Molecular constants of the b3Π0u and A1Σu+ states were derived from the fluorescence spectra.
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