Abstract
Laser-induced fluorescence (LIF) optical spectra of theD1Π–X1Σ+system of the NaK molecule have been reinvestigated. In this new analysis, quantum numbers have been assigned to 3000 selected fluorescence lines for a wide range of vibrational and rotational levels (J≤ 149,v′ ≤ 23,v″ ≤ 47). A new set of constants of theX1Σ state (Dunham-type coefficients) and term values of theD1Π state have been determined by a weighted least-squares fit of the LIF optical lines of theD–Xsystem, some lines of theC–Xsystem, and microwave spectral data reported recently. Constants forX1Σ (in cm−1) are as follows: ωe= 123.993, ωexe= 0.3045,Be= 0.095229, and αe= 4.48 × 10−4. The equilibrium internuclear distance isre= 3.49903 Å, very little changed from the microwave value.
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