POLARIZATION LABELING SPECTROSCOPY OF THE 3(1)PI AND 6(1)SIGMA(+) STATES IN NAK

The 3 (1)Pi and 6 (1)Sigma(+) states of the NaK molecule were investig ated by polarization labeling spectroscopy in a heat pipe oven. About 2000 molecular transitions in the 3 (1)Pi <-- X (1)Sigma(+) and 6 (1)S igma(+) <-- X (1)Sigma(+) band systems were measured in the 24 600-27 700 cm(-1) spectral range. The analysis provided molecular constants a nd the potential-energy curve corresponding to 97% of the potential we ll of the 3 (1)Pi state. For the double minimum 6 (1)Sigma(+) state ne arly the whole inner potential well was characterized. The results are compared with the predictions of recent theoretical calculations. [S1 050-2947(98)02308-7]