The D1 Π state of the NaRb molecule

We present a detailed experimental study of the D(1)Pi state of the NaRb molecule by means of Fourier transform spectroscopy of laser induced fluorescence. The entire data field for the D(1)Pi state of (NaRb)-Rb-85 and (NaRb)-Rb-87 consists of rovibrational levels with v' = 0-39 and J' = 1-200. The data were incorporated into a direct fit of a single potential energy curve to the level energies using the Inverted Perturbation Approach method. The D(1)Pi state q factors, which describe the Lambda-doubling, have been obtained in a wide range of rotational and vibrational quantum numbers. Analysis revealed several perturbation regions in the D(1)Pi state.