The 61Πu ← X1 band system in the Li2 molecule is investigated by the polarisation labelling spectroscopy technique. The excited state is characterised by a set of Dunham coefficients describing f parity levels υ = 0–11, J = 2–47 in the 7Li2 isotopologue and the absolute vibrational numbering is determined by observation of the isotopic effect. The state is identified as 61Πu(2s + 4d) by comparison with theoretical calculations. The main equilibrium constants are Te = 36863.25(5) cm−1 (with respect to the minimum of the electronic ground state), ωe = 253.567(36) cm−1, Re = 3.1639(2) Å.
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Grochola et al. (2008) studied this question.
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