The Ground State X1Sigma+ of NaK Revisited.
Laser-induced fluorescence (LIF) optical spectra of the D1Pi-X1Sigma+ 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 the X1Sigma state (Dunham-type coefficients) and term values of the D1Pi state have been determined by a weighted least-squares fit of the LIF optical lines of the D-X system, some lines of the C-X system, and microwave spectral data reported recently. Constants for X1Sigma (in cm-1) are as follows: omegae = 123.993, omegaexe = 0.3045, Be = 0.095229, and alphae = 4.48 x 10(-4). The equilibrium internuclear distance is re = 3.49903 Å, very little changed from the microwave value. Copyright 1998 Academic Press.
Krou-Adohi
A
Département de Physique, F.A.S.T., Abidjan, Côte d'Ivoire
Giraud-Cotton
S