We use laserhyphen;induced fluorescence (LIF) combined with a high resolution grating spectrometer to study theDthinsp;1Pgr;rarr;athinsp;3Sgr;+transitions of the heteronuclear alkali dimer NaK. Intense perturbations of theDthinsp;1Pgr; state permit high resolution measurements and facilitate study of the corresponding intensities. From these spectra, we evaluate the molecular constants of theathinsp;3Sgr;+state of NaK and estimate the parameters involved in the perturbations of theDthinsp;1Pgr; state. Various features of the perturbing levels are discussed. We compare the results of our analysis with the results of spinhyphen;exchange scattering experiments on the NaK system and with theoretical calculations. In addition, very accurate dissociation energies,De(NaK,1Sgr;+) =5268.1plusmn;0.8 cmminus;1andDe(NaK,athinsp;3Sgr;+) =203.1plusmn;0.5 cmminus;1, are obtained.
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