Abstract
Polarization labelling spectroscopy is applied to study the previously unobserved 5 1Σ + state of the NaK molecule. Molecular constants and a Rydberg–Klein–Rees (RKR) potential energy curve based on these constants are determined. The values of T e, ω e and R e are 23530.62(6) cm −1, 115.60(6) cm −1 and 4.307 Å, respectively.
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