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The E(4)1Πu←X1Σ+g band system of the K 2 molecule is investigated by the technique of Doppler-free optical–optical double resonance polarization spectroscopy. The observed vibrational levels v=0 to 9 of the E state are subject to numerous rotational perturbations by the neighboring 43Πu, 41Σ+u, and 53Σ+u electronic states. By using deperturbation methods, the potential curves of the 41Πu and...
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