Abstract
This paper presents an accurate potential curve for the groundstate of the NaK molecule. A series of resolved laser-inducedfluorescence spectra of the A-X system allowed a spread ofrotational levels in the lowest 70 vibrational levels (99.9%of the total well depth) to be observed. A variational methodcombining the inverted perturbation approach of Vidal andScheingraber (Vidal C R andScheingraber H 1977 J. Mol. Spectrosc. 65 46) forshort internuclear distances with an analytical expression forinternuclear distances beyond 8.5 Å has been used to constructa potential energy curve which reproduces the measured groundstate energies with an rms error of 0.003 cm-1. The dissociation energy and coulombicparameters governing the Na(3s) + K(4s) interactionderived from this potential curve are compared with recentvalues.
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