Dissociation energy of diatomic molecules - comment on the work of Kaur and Mahajan

When observed spectrum of a diatomic molecule is expressed in terms of the Dunham coefficients Y-00, Y-10, Y-20, Y-01, and Y-11 only, dissociation ene rgy of the molecule is given by Y-00 + Y-10(2)/(-4Y(20)) Kaur and Mahajan [ 1] have used the Dunham coefficients Y-10, Y-20, Y-01, and Y-11, for 15 vib rational states of 12 diatomic molecules (Y-00 is zero for the cases accoun ted for), but their dissociation energy cannot be reproduced dissociation e nergy cannot be reproduced by the expression Y-10(2)/(-4Y(20)). Probable re ason for the discrepancy has been discussed.