Rotational perturbations between Rydberg states of Li2

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Abstract
With two cw single mode dye lasers selective two‐step excitation of Rydberg levels of the Li2 molecule is achieved which is detected by optical double resonance polarizationspectroscopy. The Doppler‐free DR signals allow accurate measurements of rotational perturbations which cause level shifts and intensity anomalies due to interference phenomena. The experimental results are discussed and molecular constants for the deperturbed Rydberg states are given, which, together with the coupling matrix elements allow the accurate reproduction of the measuredspectra.