Determination of the Na–Kr interaction potential in the XΣ and AΠ state by laser spectroscopy

Abstract

We have extended our previous laser spectroscopic investigation of the AΠ–XΣ transition of the van der Waals molecule NaKr84. Our experimental data consist now of about 1300 absorption lines and of the spectral intensity distribution of the fluorescence light. Spectroscopic parameters have been derived for the vibrational states 0,...,2 of the XΣ state and 7,...,14 of the AΠ state. The interatomic potentials of the XΣ and the AΠ states have been determined in a fully quantum-mechanical approach using analytical HFD or Tang–Toennies functions. For the equilibrium distance and the well depth we obtain 4.918(4) Å, 68.4(5) cm−1 for XΣ and 3.03(4) Å, 3.05(4) Å and 795(25) cm−1, 760(20) cm−1 for AΠ1/2 and AΠ3/2, respectively.