High resolution laser spectroscopy of the B 1Π−X 1∑+ transition of 23Na39K, and the perturbation between the B 1Π and c 3∑+ states

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Abstract
The Doppler‐free laser polarization spectrum of the B1Π −X1∑+ transition of 23Na39K was measured, and the molecular constants of the B1Π state of v=0∼16 were determined. The perturbation between the B1Π(v=8) and the c3∑+(v=22) levels at small J were studied in detail. By comparing the observed line intensities of the B1Π(v=16, J=14) −X1∑+(v‘=0∼50, J=13 and 15) transition with the calculated Franck–Condon factors, the dependence of the transition dipole moment on the internuclear distance was determined. Absolute vibrational numbering of the c3∑+ state was done by comparing the calculated Franck–Condon factors with the observed line intensities of the c3∑+ −a3∑+ transition.